Stabilize the oxygen vacancies in LaFeO3 via altering local electronic structure with CeO2 and WS2 QDs: A novel strategy for achieving durable visible light driven photoinactivation
S. Sudheer Khan , J.P. Steffy , Alanoud T. Alfagham , Abdallah M. Elgorban
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引用次数: 0
Abstract
Developing economical and effective water disinfection methods is essential due to the significant health risks posed by microbial contamination, including Staphylococcus epidermidis. This study investigates the potential of CeO2-LaFeO3-WS2 quantum dots (CLW-QDs) nanocomposites (NCs) for photocatalytic inactivation of S. epidermidis. An n-p-n heterostructure NCs was synthesized by a facile method to enhance the photoinactivation efficiency by constructing an interfacial electric field. Engineered oxygen vacancies in LaFeO3 played a crucial role in trapping excited electrons and reducing charge recombination. The morphology, structural integrity, chemical states, N2 adsorption properties, and optical characteristics of the fabricated NCs were assessed using SEM, HR-TEM, XRD, XPS, BET, and UV–vis DRS. The constructed interfacial electric field was elaborated by XPS analysis. The recycling ability of NCs was analyzed over six consecutive cycles, confirming structural stability and resistance to photo-corrosion. Reactive oxygen species generation was quantified using scavengers. The NCs' inactivation performance against S. epidermidis was evaluated across a pH range of 4–9. Release of proteins from bacterial cells and possible nucleic acids content were determined during photoinactivation. In addition, SEM analysis was used to validate the loss of cell integrity. Real-time samples of water from a sewage treatment plant were used in photoinactivation investigations and chemical oxygen demand was also evaluated during photoinactivation studies. This comprehensive evaluation highlights the potential of CLW-QDs NCs as an effective photocatalyst for water disinfection.
期刊介绍：
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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