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Öğe Assessing the impacts of titanium dioxide nanoparticles on seed germination and seedling growth in wheat(Konya Teknik Univ, 2024) Ateş Sönmezoğlu, Özlem; Kamo, Alaa; Bozkaya, Büşra; Sönmezoğlu, SavaşWheat is the main food source for key nutrients in humans, hence any new research into boosting wheat quality and yield is vital. Recent advances in nanotechnology have made nanoparticles appropriate for use in agriculture. Titanium dioxide (TiO2) nanoparticles have a considerable impact on plants, but further research is required to make them commercially feasible. Herein, we evaluate the impact of TiO2 nanoparticles not only on the germination of seeds but also on the growth of wheat (Triticum aestivum L.) through soil application. The experimental findings reveal that TiO2 treatment at concentrations up to 2000 mg/L in seeds planted in Petri dishes has a favorable effect on wheat root and shoot length, whereas it has a suppressive effect at higher concentrations. As expected, a similar trend is observed for plant shoot length in the soil treatment with beneficial effects recorded up to a dosage of 60 mg/kg. In conclusion, the beneficial effects of TiO2 nanoparticles on seed germination and plant growth may have a big financial impact on horticulture, agriculture, and the energy industry-particularly on the manufacturing of biofuels.Öğe Baryum katkılı çinko kalay oksit nanoparçacıklarının fotokatalitik ve antibakteriyel özelliklerinin incelenmesi(Karamanoğlu Mehmetbey Üniversitesi, 2022) Kamo, AlaaSon yıllarda fotokatalitik ve antibakteriyel çalışmalarda kullanımı artan çinko kalay oksit (Zn2SnO4), yüksek elektron hareketliliği ve elektrik iletkenliğinden dolayı önemli bir üçlü yarı iletken oksit malzeme olarak kabul edilmektedir. Ancak Zn2SnO4 nanoparçacıkları, yüksek rekombinasyon oranı ve görünür ışık altında sınırlı fotokatalitik ve antibakteriyel aktivite özelliklerini sergilemektedir. Bu eksikliklerin giderilmesine yönelik sunulan yaklaşımların araştırılması büyük önem arz etmektedir. Bu tez çalışmasında Zn2SnO4 nanoparçacıklarına baryum elementi katkılanarak görünür ışık altında fotokatalitik ve antibakteriyel aktivitesinin artırılması amaçlanmıştır. Bu amaç doğrultusunda, ciddi bulaşıcı hastalıklara neden olan hastane içi enfeksiyonlar oluşturabilen Escherichia coli ve Staphylococcus aureus bakteri suşlarına karşı ilk defa kullanılan baryum katkılı Zn2SnO4 nanoparçacıklarının antibakteriyel aktiviteleri araştırılmıştır. Baryum katkılı Zn2SnO4 nanoparçacıklarının saf Zn2SnO4 nanoparçacıklarına kıyasla hem UV hem de görünür ışık altında da daha yüksek fotokatalitik aktivite sergilediği tespit edilmiştir. Optimum katkı oranının % 0,2 olduğu tespit edilmiş ve % 0,2 Ba- Zn2SnO4 nanoparçacıklarının UV ve görünür ışık altında Rhodamine B boyasını sırasıyla % 99,04 ve % 98,86 bozunuma uğrattığı görülmüştür. Fotokatalitik aktivite özellikleri ile uyumlu olarak % 0,2 Ba- Zn2SnO4 nanoparçacıklarının her iki bakteriye karşı daha yüksek antibakteriyel özellik sergilediği görülmüştür. Sonuç olarak Zn2SnO4 nanoparçacıklarının hem fotokatalitik hem de antibakteriyel aktivitesi Ba katkısı ile artırılmıştır. Ba katkılı Zn2SnO4 nanoparçacıklarının yüksek fotokatalitik ve antibakteriyel aktivitesinden dolayı diğer metal oksit yarı iletkenlere alternatif bir malzeme olarak kullanılabileceği sonucuna varılmıştır.Öğe Highly efficient photocatalyst based on Zn2-xBaxSnO4 alloying nanoparticles with enhanced photocatalytic activity(Elsevier, 2025) Kamo, Alaa; Sönmezoğlu, Özlem Ateş; Sönmezoğlu, SavaşIn this study, an effective Zn2-xBaxSnO4 alloying nanoparticles were hydrothermally designed with a series of barium cation as alloying dopant and utilized as a photocatalyst to decompose the rhodamine B which causes harmful effects on humans such as allergic dermatitis, skin irritation, mutation, and cancer. It is noteworthy that the Zn1.988Ba0.012SnO4 alloying-based catalyst exhibited more than 99 % degradation in only 140 min in wastewater than barium-free ternary oxide. Moreover, the reaction rate of Zn1.988Ba0.012SnO4 alloying-based catalyst was enhanced to 0.032 min-1 compared with barium-free ternary oxide (0.0179 min-1). Based on scavenger trapping experiments, hydroxyl radicals are the main reactive oxygen species responsible for photocatalytic activity of Zn1.988Ba0.012SnO4 alloying-based catalyst. Besides, the photocatalytic rate was maintained 94.89 % after 5th cycle. This research not only provides a novel strategy for developing alloying-based catalysts but also unveils their potential in photoelectrochemistry and photocatalysis.Öğe Ternary zinc-tin-oxide nanoparticles modified by magnesium ions as a visible-light-active photocatalyst with highly strong antibacterial activity(Royal Soc Chemistry, 2024) Kamo, Alaa; Sönmezoğlu, Özlem Ateş; Sönmezoğlu, SavaşHospital-acquired infections (HAIs), especially nosocomial infections caused by antibiotic-resistant bacteria, are one of the most pressing health problems in all societies. Therefore, there is an urgent need to develop novel disinfection methods as alternatives to antibiotics to act against multidrug-resistant bacterial strains. Even though the photocatalytic disinfection phenomenon has been considered as a viable alternative compared to other proposed solutions, there is still a need to develop innovative functional materials for improving its efficacy under visible light to have a comparable impact to UV radiation. To boost the antibacterial efficacy under visible light, herein, we developed hydrothermally ternary zinc-tin-oxide (Zn2SnO4) nanoparticles modified with magnesium (Mg2+) ions at different doping ratios (0.5%, 1.0%, 1.5%, and 2.0%) as a photocatalytic disinfection agent and utilized it for the first time to kill Gram-negative (E. coli) and Gram-positive (S. aureus) pathogens that cause nosocomial infections. Moreover, we also explored how these materials interact with organic pollutants in the presence of visible light. Mg2+ cationic ions significantly enhanced the photocatalytic efficiency of ZTO nanoparticles under visible light to achieve 98% degradation of RhB dye in just 100 min, and rapidly produced numerous hydroxyl radicals as the main reactive oxygen species (ROS) responsible for the degradation, playing a key role in the nanoparticles impressive disinfection efficacy against these pathogenic bacteria. More importantly, Mg1.5@ZTO nanoparticles could effectively kill 99.76% of E. coli and 96.96% of S. aureus within only 1 h under visible light due to their smaller particle size, larger surface area, low recombination rate and greater ROS generation with oxygen vacancies. This research suggests that Mg-doped ZTO nanoparticles might be a viable and highly effective photocatalytic antibacterial agent candidate for future commercialization in healthcare and environmental applications.Öğe Unraveling the effects of strain-ınduced defect engineering on the visible-light-driven photodynamic performance of zn2sno4 nanoparticles modified by larger barium cations(Amer Chemical Soc, 2024) Kamo, Alaa; Sönmezoğlu, Özlem Ateş; Sönmezoğlu, SavaşWaterborne infections caused by pathogenic microorganisms represent serious health risks for humans. Ternary zinc-tin oxide nanoparticles have great potential as a cost-effective, environmentally friendly, and efficient candidate for waterborne infections; however, their photocatalytic and antibacterial effects are quite limited due to insufficient visible light absorption and rapid electron-hole recombination. Herein, barium-doped zinc stannate (Ba@ZTO) nanoparticles were synthesized by the hydrothermal method and used for the first time not only as antibacterial agents to prevent the spread of the harmful bacteria S. aureus and E. coli but also as photocatalysts to degrade the organic pollutant rhodamine B. Unexpectedly, Ba2+ ions exhibited compressive stress behavior instead of the predicted tensile stress when inserted into the ZTO crystal lattice, playing an active role in increasing oxygen vacancies within the crystal lattice and in the formation of hydroxyl radicals in the bulk solution and hydrogen peroxide (H2O2) radicals, significantly improving the photocatalytic and antibacterial properties. Strain-induced defects created by the insertion of larger barium ions into the ZTO lattice promote the increase of shallow traps for boosting photocatalytic/disinfection properties while suppressing deep-level traps that encourage nonradiative recombination. In essence, defect and strain engineering opens a promising route to achieve high disinfection efficiency by inducing larger cation ions under visible light in oxide-based materials.
