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Morphologies controlled ZnO for inactivation of multidrug resistant pseudomonas aeruginosa in solar light
摘要： The different morphology and size of the zinc oxide (ZnO) were synthesized by a co-precipitation process via variation of calcination temperature from 400 oC to 900 oC. The nanorod, flower, hexagon, pentagon, and microflambeau morphologies were obtained. Flower morphology of ZnO tends to inactivate multidrug resistant Pseudomonas aeruginosa (P. aeruginosa) completely within 45 min under solar light irradiation than other morphologies due to efficient separation electron-hole pairs. The P. aeruginosa inactivation was confirmed by transmission electron microscope (TEM) images, DNA fragmentation (gel electrophoresis) and protein degradation (Bradford assay). The TEM mapping illustrates the damaging of bacteria by active species but not the releasing of Zn2+ ions in bacteria cell. The prevention of charge recombination was confirmed by transient photocurrent response and electrochemical impedance spectra (EIS) measurements. Electron spin resonance (ESR) spectroscopy suggests that O2ˉ?, OH?, and h+ are responsible for P. aeruginosa inactivation in solar light. So, this work provides a detail investigation of morphology/size dependent photocatalytic inactivation of multidrug resistant pathogen in solar light.
关键词： ZnO,Solar light,Flower,bacterial inactivation,Pseudomonas aeruginosa
更新于2025-09-12 10:27:22
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Modification of P25 titania in presence of hydrazine for <i>Staphylococcus aureus</i> inactivation
摘要： Titania and its polymorphs are one of the most studied semiconductor photocatalyst. Herein, the P25 titania was used as a precursor to modify the phase and structure with microwave assisted hydrothermal and sonochemical methods in presence of alkaline hydrazine. The outcome results show the cotton ball structure titanate composite phases (nanotubes, nanosheets and nanoparticles) and monoclinic titanate phase (TiO2-B) with microwave assisted hydrothermal method and sonochemical method, respectively. The nitrogen doping was confirmed by FTIR and DRS in modified TiO2. And some visible light absorption was observed in modified TiO2 due to the nitrogen doping. The composite phase titanate having cotton ball structure was found to be efficient for methicillin-resistant superbug Staphylococcus aureus (MRSA) inactivation. Herein, we also reported the submicron TiO2-B sword like morphology fabricated by sonochemical method for the first time in presence of alkaline hydrazine.
关键词： Bacterial inactivation,Titania,Sonochemical,Microwave assisted hydrothermal
更新于2025-09-10 09:29:36
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Exploration of charge carrier delocalization in the iron oxide/CdS type-II heterojunction band alignment for enhanced solar-driven photocatalytic and antibacterial applications
摘要： Recyclable magnetic photocatalysts of iron oxide (IO)/CdS core/shell nanocrystals (CSNCs) were prepared by a facile sequential one-pot method using 3, 3'-thiobispropanoic acid (TDP) as a bridge. The CSNCs showed redshift in absorption edge, decrease in the optical band gap, reduced exciton decay rates and increment in particle size. Quenching studies have been employed to understand the position of the electron/hole wave-functions at the IO/CdS interface. Antimicrobial tests have also been performed using broth tube dilution and disc diffusion methods against S. aureus. Additionally, photocatalytic properties of IO/CdS CSNCs have been evaluated for the decomposition of xylenol blue. In comparison with CdS quantum dots (QDs) and iron oxide nanoparticles (IONPs), the IO/CdS CSNCs showed improved photocatalytic and bactericidal activities. Finally, levels of oxidative damage to proteins and lipids were evaluated.
关键词： Photocatalysis,Wave-function engineering,Advanced oxidation process,Iron oxide/CdS nanocrystals,Photocatalytic bacterial inactivation
更新于2025-09-04 15:30:14