Teknik Bilimler MYO, Mülkiyeti Koruma ve Güvenlik Bölümü,Makale Koleksiyonu

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Listeleniyor 1 - 20 / 20

Digital public administration and digital cities
(Nova Science Publishers, 2025) Söylemez, Adnan; Polat, Mehmet
Technological development, which has reached a dizzying pace in our age, brings many changes. The most important of these changes is the increase and differentiation of citizens' demands from public administration in parallel with the development of information and communication technologies. To respond to these demands, public administrations have entered into a digital transformation process, although at varying levels. While public administrations are digitalized, cities, which are where increasing and differentiating demands are concentrated, have their share in this process. As a matter of fact, the areas where public services are demanded intensively are mostly urban areas. For this reason, parallel to the digitalization of public administration, cities have also started to digitalize and become smart. In this context, cities are trying to adapt to this digitalization trend with the concepts of a digital city, an intelligent city, and a smart city. This study first explains the concepts of digital city, intelligent city, and smart city, which correspond to similar but different phenomena and are often wrongly used interchangeably. In addition, it reveals the reasons why there are no examples of smart cities designed from a holistic perspective, except for a few singular examples in the world, and how the smart city vision can be achieved. © 2025 Nova Science Publishers, Inc. All rights reserved.
A half-natural origin approach for anticancer and antioxidant activities using sporopollenin and pillar[5]arene macroring
(Elsevier, 2025) Ulusu, Funda; Bilgiç, Ali; Kursunlu, Ahmed Nuri
Sporopollenin is a natural biomacromolecule which can be found in the outer wall (exine) of spores or pollens that it can be performed with clever designing in a lot of innovative and scientific areas. In this paper, a novel sporopollenin reformed with a recently synthesized pillar[5]arene molecule were elucidated by FT-IR spectroscopy, TGA and SEM techniques. This study is the first report leading to a comprehensive investigation of the biological applications of a functionalized bio-microcapsule including antioxidant and anticancer properties. Two in vitro assays (DPPH and FRAP) were used to determine the antioxidant activities of sporopollenin and functionalized microcapsules. Furthermore, the anticancer activities of these microcapsules were tested on 2 different cancer cell lines (HT-29 and MCF-7), and a fibroblast cell line (L929) by the Alamar blue assay. Among the samples tested in the antioxidant capacity results, especially Sp-P[5] exhibited higher antioxidant capacity and stood out with IC50: 101.98 f 4.32 mu g/mL in DPPH assay and IC50: 87.97 f 3.14 mu g/mL in FRAP assay. Similar to the antioxidant result, Sp-P[5] bio-microcapsule had greater cell inhibition on HT-29 (IC50: 132.31 f 5.38 mu g/mL), MCF-7 (IC50: 107.30 f 8.28 mu g/mL), and L929 (IC50: 255.80 f 4.91 mu g/mL) cell lines than Sp and Sp-APTMS. The analysis results in the study show promise for the development of sporopollenin-based micro- capsules to deliver and enhance the biological activity of compounds with therapeutic potential.
Synthesis, characterization, and application of novel fluorescent sporopollenin for effective detection of mercury (II) ions from aqueous media
(Elsevier, 2024) Bayrak, Melike; Çimen, Aysel; Bilgiç, Ali
In this investigation, a novel environmentally friendly functionalized fluorescent Sp-TAB hybrid material was advanced for the sensitive detection of environmentally polluting Hg(II). The characterization of the synthesized fluorescent Sp-TAB hybrid material using SEM and EDX provided insights into morphological and structural changes in the material's pore structure, while XRD and FT-IR analyses revealed the impact of the prepared material at each stage. Optimal parameters such as temperature, contact time, and pH influencing Hg(II) ion detection were determined. Application of the fluorescent Sp-TAB hybrid material was determined a detection limit (LOD) of 4.87 mu M for Hg(II) ions. This study shows the potential of the immobilization-enhanced fluorescent Sp-TAB hybrid material for sensitive Hg(II) ion detection in tap water. Additionally, this study is believed to serve as a model for sensitive and practical detection applications of heavy metals in the future.
Preparation of pillar[5]arene functionalized silica gel hybrid material: investigation of biological (antimicrobial, antioxidant and anti-cancer) properties
(Springer, 2024) Ulusu, Funda; Bilgiç, Ali
The current study presents the incorporation of APTMS and pillar[5]arene groups into the molecular structures of silica gel materials whose structures were elucidated by characterization techniques such as SEM, FT-IR, and TGA. Comprehensive biological applications of these derivatives such as antibacterial, antioxidant and anticancer were evaluated for the first time in the study. The data show the effectiveness of the silica gel materials, especially Si-APTMS-pillar[5]arene, in the fight against pathogenic microorganisms with its strong antibacterial properties against both gram-negative and gram-positive bacteria. They also reveal that these materials have significant antioxidant pharmacological potential with their significant DPPH scavenging activities. The results obtained from cytotoxicity studies highlight their potential as anticancer agents, with the synthesized silica gel materials, especially Si-APTMS-pillar[5]arene materials, having a greater inhibitory effect on cancer cell lines compared to healthy cell lines over a 24 h period. This comprehensive research illustrates the promising versatility of the silica gel materials in a variety of biomedical and environmental applications, including cancer therapy, antimicrobial strategies, and free radical neutralization. APTMS and pillar[5]arene groups have been successfully added to the molecular structures of silica gel materials.The surface of Si, Si-APTMS and [5] materials was characterized by various techniques such as FT-IR, TGA, SEM.The comprehensive biological applications of Si, Si-APTMS and [5], including antibacterial, antioxidant and anti-cancer studies, were realised for the first time in this study.Remarkable anti-cancer mechanisms of [5] supramolecule on HT-29 cell line were suggested.Silica gel materials have efficacy in combating pathogenic microorganisms with strong antibacterial properties and pharmacological potential as important antioxidative materials with pronounced DPPH scavenging activities.
Fabrication and characterization of new Fe3O4@SiO2@TiO2-CPTS-HBAP (FST-CH) nanoparticles for photocatalytic degradation and adsorption removal of rhodamine B dye in the aquatic environment
(Elsevier Ltd., 2024) Çimen, Aysel; Bilgiç, Ali; Bayrak, Melike
In this study, Fe3O4@SiO2@TiO2-CPTS-HBAP (FST-CH) nanoparticle was prepared for the simultaneous adsorption and photocatalytic degradation of aromatic chemical pollutants (Rhodamine B dye) in aqueous solution. FST-CH nanoparticle was characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), Energy Dispersive X-Ray (EDX) Fluorescence Spectrometer and X-Ray Diffraction (XRD) spectroscopy. The photocatalytic activity of rhodamine B dye (RhB) was evaluated with a Kerman UV 8/18 vertical roller photoreactor. About 56% of RhB in aqueous medium was adsorbed by FST-CH nanoparticles with only 45 min of stirring in the dark, and about 77.01% was degraded or converted to other structures under the photoreactor for 120 min. The photocatalytic degradation of RhB (apparent rate constant: 0.0026 mg dm−3 min−1) occurred by a pseudo-second order reaction. In addition, the recovery of the prepared magnetic FST-CH nanoparticle by an external magnetic field, exhibiting good magnetic response and reusability, shows that the obtained magnetic FST-CH nanoparticle is stable and maintains high degradation ratio and catalyst recovery even after four cycles. Thus, the prepared FST-CH nanoparticle can be highly recommended for its use in potential applications of water decontamination.
Ultra-hybrid sensor based on magnetic and fluorescent biomaterial for the sensitive/selective detection of toxic Ag+ and Hg2+ ions in real samples
(Elsevier Ltd., 2024) Bilgiç, Ali; Çimen, Aysel; Bayrak, Melike; Kurşunlu, Ahmed Nuri
The development of high-performance, eco-friendly and magnetic sensors prepared from natural products have recently attracted a lot of attention for the selective detection of metal ions in aqueous environments and the simultaneous detection of metals in the same environment. In this study, a fluorescent and magnetic sensor (MSp-P[5]-EN-B) was prepared by the immobilization of Bodipy and pillar [5]arene on the sporopollenin surface modified by Fe3O4 for the selective detection of Ag+ and Hg2+ ions separately and together in the aqueous solution. The characterization of the fluorescent and magnetic sensor, MSp-P[5]-EN-B, was supported by techniques such as SEM, FT-IR, and XRD. The fluorescence data of MSp-P[5]-EN-B sensor was examined with various concentrations in the range 1–100 μM that in here, an “on-off” fluorescence process for Ag+, and Hg2+ and the detection limits are 0.019 μM and 0.33 μM, respectively. As a result, the designed magnetic MSp-P[5]-EN-B sensor showed strong potential in terms of its accurate, sensitive, and practical application in the separate and simultaneous detection of Ag+ and Hg2+ ions in aqueous media.
A novel biosorbent functionalized pillar[5]arene: Synthesis, characterization and effective biosorption of Cr(VI)
(Elsevier B.V., 2022) Bilgiç, Ali; Çimen, Aysel; Kurşunlu, Ahmed Nuri
Among toxic chemicals, hexavalent chromium (Cr(VI)) is one of the most carcinogenic and toxic pollutants that hostiles to the health of both humans and other living things. Therefore, the removal of Cr(VI) is of great importance to keep our environment clean and tidy. In this study, an easy-make, inexpensive, and natural biosorbent material (Sp-P[5]) was prepared to preserve our environment using a pillar[5]arene based-on sporopollenin microcapsule. The prepared biosorbent was successfully characterized by some techniques such as FTIR, XRD, and SEM. The biosorbent, Sp-P[5], exhibited an open mesoporous structure richly decorated with multi-amine-containing moieties resulting in enhanced Cr(VI) sorption. The sorption behavior of Cr(VI) ions is satisfactorily adapted from the sorption kinetics pseudo-second-order law and the isotherm models to the Langmuir model at different temperatures. The Langmuir model fits at different temperatures (298–328 K) and the maximum sorption capacities of the Cr(VI) ion ranged from 106.38 to 117.26 mg/g. The thermodynamic calculations reveal that the sorption of Cr(VI) ions on the Sp-P[5] is entropy-driven, endothermic, and spontaneous. The prepared biosorbent was also applied to the natural wastewater samples and different ions (chromate and dichromate). The sorption and desorption experiments showed that the sorption efficiency for Cr(VI) ions of the Sp-P[5] decreased to 70.88 % after 8 cycles. As result, the synthesized biosorbent, Sp-P[5], has outstanding potential in the removal of Cr(VI) ions from water bodies and natural wastewater systems.
Production of microcapsule biosorbent of functionalized Lycopodium Clavatum Sporopollenin (Sp-CPTS-AHP) and its application to Cr(III) ions
(Desalination Publications, 2022) Çimen, Aysel; Bilgiç, Ali; Polat, Savaş
3-(Chloropropyl)-trimethoxysilane (CPTS) was modified on Lycopodium Clavatum Sporopollenin microcapsules (Sp) with the aim of obtaining the Sp-CPTS compound. 2-amino-3-hydroxypyri-dine (AHP) was immobilized on Sp-CPTS and a microcapsule adsorbent surface (Sp-CPTS-AHP) was prepared. This surface was prepared to effectively remove Cr(III) in the solution. The surface of Sp-CPTS-AHP microcapsule biosorbent was successfully characterized by Fourier-transform infrared spectroscopy and scanning electron microscopy. Some experimental parameters (pH, contact time, amount of biosorbent, temperature and concentration) affecting the removal of Cr(III) were investigated. Adsorption isotherm models were utilized to explain the adsorption event on the microcapsule biosorbent. As a result of Cr(III) application with Sp-CPTS-AHP microcap-sule biosorbent, approximately 70% Cr(III) removal was obtained at pH 6. The ΔH° value calculated for the Cr(III) in the solution at temperatures between 25°C–50°C is 29.31 kJ mol–1 and the ΔS° value is 235.88 J mol–1 K–1. The mean adsorption energy for the Sp-CPTS-AHP microcapsule biosorbent was calculated as 0.893, 1.271, 1.549 and 2.744 kJ mol–1 for 298, 308, 319 and 328 K, in Cr(III) solution respectively. According to the parameters interpreted from the experimental data, the best Cr removal was attained at pH = 6.0, 0.03 g adsorbent, 298 K temperature, 30 mg L–1 initial concentration and 90 min contact time. The correlation coefficient (qe) calculated with the pseudo-second-order model is 14.993 mg g–1 and the correlation coefficient calculated with the pseudo-first-order model is 7.568 mg g–1. Langmuir maximum adsorption capacity (qm) is 17.668, 19.646, 20.704 and 21.929 mg g–1 for 298°C, 308°C, 318°C and 328°C, respectively. The newly synthesized microcapsule adsorbent surface has shown significant success in removing Cr(III) from the solution. Therefore, it can be recommended for the effective removal of heavy metals from water.
Synthesis, characterization, and application of functionalized pillar [5] arene silica gel (Si-APTMS-pillar [5] arene) adsorbent for selectivity and effective removal of Cu (II) ion
(Springer Heidelberg, 2022) Bilgiç, Ali; Çimen, Aysel; Kurşunlu, Ahmed Nuri; Karapınar, Hacer Sibel; Güler, Ersin
This study presents a modified silica gel used as the solid support that an adsorbent modified by pillar[5] arene as a new and efficient absorbent (Si-APTMS-pillar[5]arene) was used for the removal of Cu(II) ions from aqueous solution. XRD, FT-IR, and SEM analysis were used to characterize the morphology and structure of the Si-APTMS-pillar[5]arene adsorbent material. The maximum adsorption capacities of Cu(II) ions at dissimilar temperatures via the Langmuir model were 75.1880 mg/g (298 K), 76.3359 mg/g (308 K), 78.1250 mg/g (318 K), and 79.3651 mg/g (328 K), respectively, at 90 min and pH 5.0. The selectivity to Cu(II) ions is quite high, and especially the prepared adsorbent showed high reusability and maintained its high efficiency even after 3-5 cycles of regeneration. Si-APTMS-pillar[5]arene adsorbent prepared for the effective treatment of water and copper-contaminated wastewater is promising as a new, cost-effective, and non-toxic adsorption technique.
APTMS-BCAD modified magnetic iron oxide for magnetic solid-phase extraction of Cu(II) from aqueous solutions
(Elsevier Ltd., 2022) Bilgiç, Ali; Karapınar, Hacer Sibel
Fe3O4@SiO2-3-aminopropyltrimethoxysilane-1,8-bis (3-chloropropoxy) anthracene-9,10-dione was synthesized as a new, sustainable, and environmentally friendly adsorbent for magnetic solid-phase extraction of Cu(II) from aqueous solutions. The structure of the adsorbent was characterized by FTIR, XRD, SEM, EDX, and TEM analysis. Optimum conditions for Cu(II) adsorption were determined as adsorbent dose 0.04 g, pH 5.0, contact time 120 min, and beginning concentration of 30 mg/L in the adsorption process. The adsorption capacity for Cu(II) ions was 43.67 mg/g and the removal efficiency was 84.72 percent. The Langmuir isotherm and the pseudo-second-order model fit the experimental data better. Adsorption was a spontaneous and endothermic process based on the obtained thermodynamic properties such as ΔG°, ΔH°, and ΔS°. The results showed that the sorbent has good selectivity in the presence of competing ions. The method was determined to be accurate and effective using real water samples and CRM
Fabrication of monoBODIPY-functionalized Fe3O4@SiO2@TiO2 nanoparticles for the photocatalytic degradation of rhodamine B under UV irradiation and the detection and removal of Cu(II) ions in aqueous solutions
(Elsevier Ltd., 2022) Bilgiç, Ali
In this study, the potential of magnetic fluorescence hybrid nanoparticle (Fe3O4@SiO2@TiO2-APTMS-monoBODIPY) for simultaneous detection and removal of inorganic contaminant Cu(II) ions and photocatalytic degradation of organic contaminant Rhodamine B (RhB) dye in aqueous solutions under UV light was investigated. Samples were synthesized at each stage, and the magnetic fluorescence hybrid nanoparticle was characterized by SEM, TEM, EDX, FTIR, and XRD. When Cu(II) ions were added to the Fe3O4@SiO2@TiO2-APTMS-monoBODIPY suspension mixture, the fluorescence intensity at ~ 543 nm decreased. In addition, the addition of Cu(II) ions in the presence of different cation species caused dramatic fluorescent quenching that was very selective for Cu(II) ions. The detection limit values of Cu(II) ions using the Fe3O4@SiO2@TiO2-APTMS-monoBODIPY is 0.47 µM. The prepared magnetic fluorescent hybrid nanoparticle was used for Cu(II) adsorption from aqueous solutions. Four different adsorption isotherms were calculated, and it was found that the Langmuir isotherm fit better, and the maximum adsorption capacity was 50.505 mg/g. Kinetic research followed the pseudo-second-order kinetics model. Thermodynamic parameters were calculated, and the adsorption of Cu(II) ions turned out to be endothermic, favorable, and spontaneous. RhB dyes in the suspension mixture were adsorbed on magnetic fluorescent hybrid nanomaterial in the dark with stirring for 30 min. Then after 60 min of mixing under UV light, they showed an RhB degradation percentage of 29.49%.
Fluorescent and easy-make hybrid sensor based-on silica gel&BODIPY for the detection of Cu (II) in aqueous medium: fully characterized, effective and visual data
(Institute of Electrical and Electronics Engineers Inc., 2021) Bilgiç, Ali; Çimen, Aysel; Kurşunlu, Ahmed Nuri
Cu (II) ion has potential roles in a lot of living metabolisms that its detection and removal are extremely important for flagship branches of science. In this paper, fluorescent and easy-make silica gel immobilized BODIPY were successfully prepared via a simple synthesis procedure for the rapid recognition of Cu (II) ions. The optimal emission and excitation wavelength of the synthesized hybrid material, Si-APTMS-BODIPY, was 543 nm and 460 nm, respectively. The new solid support surface fully characterized by several techniques has notable results and visual data for the detection of Cu (II) ion. The maximum fluorescent intensity of Si-APTMS-BODIPY was clearly quenched following the adding of Cu (II) ion owing to static and dynamic quenching mechanisms. Maybe, more importantly, there was a notable linear correlation between several concentrations of Cu (II) solution and the fluorescence quenching processes with a limit of detection (LOD) of 1.7 μM. Based on these, a fluorescent hybrid material having high selectivity and sensitivity was made up, and it provides a precious proposal for the recognition of Cu (II) ions.
Novel fluorescent microcapsules based on sporopollenin for removal and detection of Cu (II) ions in aqueous solutions: Eco-friendly design, fully characterized, photophysical&physicochemical data
(Elsevier B.V., 2022) Bilgiç, Ali; Çimen, Aysel; Kurşunlu, Ahmed Nuri; Karapınar, Hacer Sibel
Sporopollenin is a natural substance found in plant walls and is highly resistant to external factors. In this paper, we designed an eco-friendly hybrid material, Sp-EDA-BODIPY, based on sporopollenin microcapsule and BODIPY to remove and detect metal ions. The fluorescent surface was fully characterized with various methods such as XRD, SEM, FT-IR, fluorescence spectroscopy. The fluorescent microcapsule sensor showed fluorometrically a remarkable quenching effect in the presence of Cu (II) ion, via the complexation mechanism that LOD it was calculated as 0.773 μM. As a result of the competing ion experiments, Sp-EDA-BODIPY also has a high selective for Cu (II) ion toward another the studied metal ions. Otherwise, we also calculated the adsorption capacities and the maximum isotherm parameters and from the Freundlich, Langmuir, and Dubinin-Radushkevich equations for the removal of Cu (II) with Sp-EDA-BODIPY fluorescent microcapsule. The maximum adsorption capacities of Cu (II) on Sp-EDA-BODIPY were calculated to be 28.65, 31.25, 34.02, and 37.74 mg/g at different temperatures (298, 308, 318, and 328 K), respectively. The adsorption experimental results were closer to Langmuir adsorption isotherm and pseudo-second-order models. Thermodynamic data showed that the adsorption process was endothermic, possible, and spontaneous.
Fluorescent sporopollenin microcapsule modiﬁed by BODIPY for sensitive&selective recognition and efficient removal of Cu (II) from aqueous solution
(Institution of Chemical Engineers, 2022) Bilgiç, Ali; Çimen, Aysel; Baştuğ, Elif; Kurşunlu, Ahmed Nuri
Sporopollenin microcapsules (sporopollenin exine capsule (SEC)) have characteristic holes with 25 μm diameter and can be chemically obtained from the natural pollen grains. In this paper, a BODIPY derivative was successfully immobilized on SEC modified with 3-(aminopropyl)triethoxysilane (APTES) to obtain a fluorescent microcapsule sensor (Sp-APTES-monoBODIPY) and then it was used for both sensitive-selective detection and removal of Cu (II) ions. The prepared surfaces were characterized by several techniques like FT-IR, SEM, XRD. The photophysical measurements (response time, pH, complex stoichiometry, etc.) were fluorometrically performed for the detection of Cu (II) ions in the fluorescence spectroscopy. The limit of detection (LOD) and quantified (LOQ) are 4.9 × 10−7 M and 1.2 × 10−6 M for the detection of Cu (II) which is challenging, respectively. Otherwise, about the removal of Cu (II) with Sp-APTES-monoBODIPY fluorescent microcapsule, we also calculated the maximum isotherm parameters and adsorption capacities from the Freundlich, Dubinin-Radushkevich and Langmuir equations. When the Sp-APTES-monoBODIPY was used as an adsorbent for the removal of Cu (II) ions, the adsorption kinetics and isotherms well fitted the pseudo-second-order model and the Langmuir model, respectively. The maximum adsorption capacity is 25 mg.g−1. All results showed that the synthesized fluorescent microcapsule can be used as an ideal adsorbent and sensor material of Cu (II) ions for simultaneous environmental cleaning applications.
A new magnetic Fe3O4@SiO2@TiO2-APTMS-CPA adsorbent for simple, fast and effective extraction of aflatoxins from some nuts
(Academic Press Inc., 2022) Karapınar, Hacer Sibel; Bilgiç, Ali
A novel modified magnetic adsorbent was synthesized by binding 3-aminopropyltrimethoxysilane and 1,8-bis (3-chloropropoxy) anthracene-9,10-dione to magnetic nanoparticles. The adsorbent has been characterized by transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, fourier transform infrared spectroscopy. The extraction parameters of nanoparticle amount, pH, vortex time, and desorption conditions (solvent, volume, time) were optimized by combining aflatoxin (AFB1, AFB2, AFG1, AFG2) analyzes in samples, high-performance liquid chromatography-fluorescence detection method, and post-column derivatization. The proposed method was compared with the conventional immunoaffinity column method. Under optimum conditions, the detection limits (LODs) of the aflatoxins range from 0.05 μg kg−1 to 0.15 μg kg−1. The recovery of the four aflatoxins for the added nut samples ranged from 87.7 % to 97.5 %. In addition, the intra-day and inter-day relative standard deviations were <7.1 %. The satisfactory results show that the synthesized adsorbent has advantages such as good sensitivity and accuracy, environmental friendliness, simplicity, easy of application, reliability, and speed in the extraction of aflatoxins in some nuts.
Novel BODIPY-based fluorescent Lycopodium clavatum sporopollenin microcapsules for detection and removal of Cu(II) ions
(Elsevier B.V., 2021) Bilgiç, Ali
In this study, microcapsules of L. clavatum sporopollenin (f-sporopollenin) immobilized with BODIPY were developed. XRD, SEM, and FTIR did characterization of f-sporopollenin, showing that the BODIPY dye was successfully introduced, and the microcapsule structure of f-sporopollenin microcapsules was well preserved after the post-grafting procedure. When Cu(II) was added to the f-sporopollenin suspension, the fluorescence intensity gradually decreased at ~541 nm. Furthermore, adding Cu(II) to suspension mixtures in the presence of other cations resulted in dramatic fluorescent quenching, which showed that it was excellent selectivity for Cu(II) ions. The linear detection range for low concentration Cu(II) detection was 1 – 10 µM, and the detection limit was 7.41 × 10−7 M (0.741 µM). Prepared f-sporopollenin was also used as an adsorbent to remove Cu(II) ions from aqueous solutions. The adsorption study showed that the optimum adsorption conditions were pH = 6.0, amount of adsorbent 0.04 g, initial Cu(II) concentration at 25 mg/L, and contact time of 120 min. Adsorption isotherms and kinetics have been studied and found to fit the Langmuir isotherm model and the pseudo-second-order kinetic. The theoretical maximum Langmuir adsorption capacity of Cu(II) towards f-sporopollenin was 22.71 mg/g. Therefore, f-sporopollenin shows promise for removing and detecting Cu(II) ions in water.
Synthesis of eco-friendly Sp-EN-CPA adsorbent and its application for removal of Cr(VI) from aqueous solutions
(Desalination Publications, 2021) Çimen, Aysel; Bilgiç, Ali; Karademir, Bülent
In this study, environmentally friendly Sp-EN-CPA was synthesized to effectively remove Cr(VI) ions from aqueous solutions and wastewater. The Sp (sporopollenin) was successfully modified with ethylenediamine (EN) compound. Finally, 1,8-bis(3-chloropropoxy) anthracene-9,10-dion (CPA) compound was immobilized on the modified sporopollenin (Sp-EN). The structural and chemical properties of the newly synthesized Sp-EN-CPA adsorbent were characterized by scanning electron microscopy and Fourier-transform infrared spectroscopy images. The impact of experimental parameters such as concentration, contact duration, and temperature, adsorbent amount, and pH on the removal of Cr(VI) ions in the wastewater and aqueous solution were researched. Some adsorption isotherms were used to interpret the formation of the reaction of Cr(VI) ions attachment to the adsorbent surface. The effective elimination (97%) of Cr(VI) ions using Sp-EN-CPA compound was performed at pH 2. The maximum amount of Sp-EN-CPA for the adsorption of Cr(VI) ions in the wastewater and aqueous solution was found to be 0.075 g. Adsorption remained stable after 150 min. The Delta H degrees values of Cr(VI) ions in aqueous solution and wastewater in the 25 degrees C-50 degrees C temperature range were found to be 18.82 and 26.18 kJ mol(-1), and Delta S degrees values were found to be 103.79 and 123.01 kJ mol(-1), respectively. The average adsorption energy for the Sp-EN-CPA adsorbent was found to be 26.73 kJ mol(-1) for Cr(VI) ions in aqueous solution. Sp-EN-CPA exhibited an important achievement for the removal of Cr(VI) ions and can be suggested for the effectively elimination of Cr(VI) ions from the wastewaters.
Removal of chromium(vi) from polluted wastewater by chemical modification of silica gel with 4-acetyl-3-hydroxyaniline
(Royal Society of Chemistry, 2019) Bilgiç, Ali; Çimen, Aysel
In the current study, a new adsorbent that is insoluble in water and many acid solutions and has a high adsorption capacity for Cr(VI) metal ions was synthesized. In the synthesis process, 3-chloropropyltrimethoxysilane (CPTS) was first modified on a silica gel (Si) surface. Secondly, 4-acetyl-3-hydroxyaniline (AHAP) was immobilized on the modified silica gel compound (Si-CPTS). As a result of the immobilization process, a new adsorbent compound named Si-CPTS-AHAP (silica gel-3- chloropropyltrimethoxy silane 4-acetyl-3-hydroxyaniline) was obtained, which was used to separate Cr(VI) ions from aqueous solution (K2Cr2O7) and industrial wastewater. The material was characterized using scanning electron microscopy and Fourier-transform infrared spectroscopy. The amount of chromium adsorbed was detected by ultraviolet-visible spectroscopy. The adsorption was evaluated using batch methods. The effects of temperature, pH, concentration, adsorbent amount and interaction time on the adsorption of Si-CPTS-AHAP were also investigated. The adsorption of Cr(VI) ions on SiCPTS-AHAP was investigated via adsorption kinetics, isotherm and thermodynamic studies. The value of the isotherm parameters and the highest adsorption yields were calculated from the Dubinin– Radushkevich, Freundlich and Langmuir isotherm equations. Thermodynamic features such as entropy (DS), enthalpy (DH) and free energy (DG) were also calculated from the experimental results. The experimental results showed that the best recoveries of Cr(VI) metal ions are under the conditions of 180 min (interaction time), 0.05 g (adsorbent amount) and 323.15 K (temperature) at pH 2. Si-CPTSAHAP can be used for the removal of poisonous pollutants in wastewater.
Chemical modification of silica gel with 4,4 '-((1Z,8Z)-2,5,8-triazanona-1,8-diene-1,9-diyl)diphenol and applications to chromium Cr(VI) ions in industrial wastewaters
(Taylor & Francis Inc, 2016) Çimen, Aysel; Karakuş, Eren; Bilgiç, Ali
This study describes synthesis of a new resin through immobilization of the 4,4'-((1Z,8Z)2,5,8-triazanona-1,8-diene-1,9-diyl)diphenol (TRI) onto silica gel modified with 3-chloropropyltrimethoxy silane and its application for the removal of chromium(VI) ions from aqueous solution as well as from industrial wastewater. The same applications were also made for industrial wastewater vapor. The newly synthesized Si-TRI is characterized by scanning electron microscope and elemental analysis and Cr(VI) heavy metal ions were used as sorbate. The sorption of Cr(VI) ion was evaluated with using batch methods. The value of adsorption of Cr(VI) ion was detected by an atomic absorption spectrometer. The influences of concentration, temperature, amount of metal ions, contact time and pH to sorption on the Si-TRI were also investigated. The optimum pH range for the sorption of the metal ions is 5.0. The mean sorption energies for modified silica gel were found to be 21.32 and 17.68 kJ/mol for Cr(VI) in aqueous solution and industrial wastewater respectively, which may correspond to chemical ion-exchange. The maximum adsorption capacities and isotherm parameters were calculated from the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm equations. The adsorption of Cr(VI) ion onto the immobilized material followed the Langmuir adsorption models. Thermodynamic parameters such as free energy (Delta G degrees), entropy (Delta S degrees) and enthalpy (Delta H degrees) were also calculated from the sorption results. It was reflected reactions were endothermic and spontaneous. The modified structure used as adsorbent was successfully employed in the removal of Cr(VI) ions on the samples of industrial wastewater.
Isparta’da medikal turizmin yapılabilirliği üzerine bir çalışma
(Karamanoğlu Mehmetbey Üniversitesi, 2015-12) Gökdayı, İsmail; Polat, Mehmet
Bu çalışmanın temel amacı; medikal turizm konusunda Isparta ilinin alt yapısını ortaya koyarak, ilin medikal turizme elverişliliğini incelemektir. Bu araştırma mülakat yöntemi kullanılarak yapılmıştır. Mülakat çalışmasında, Isparta ilindeki kamu, özel sektör ve sivil toplum kuruluşlarının temsilcileriyle görüşülmüştür. Medikal turizm paydaşı kurum veya kuruluşlardan toplam 20 (yirmi) temsilciyle mülakat gerçekleştirilmişti. Mülakata katılan temsilcilerin tamamı Isparta ilinin azımsanamayacak bir turizm potansiyeline sahip olduğunu düşünmektedir. Ancak Isparta ilinde medikal turizm yapılabileceğini düşünen katılımcıların oranı ise tüm katılımcıların sadece %35’ini oluştururken, bu kişilerin görüşlerini gerekçelendirmekte zorlandıkları da dikkat çekmiştir. Sonuç olarak, mevcut alt yapıyla Isparta ilinde medikal turizmin geliştirilmesi mümkün gözükmemektedir.

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