Advances in powder nano-photocatalysts as pollutant removal and as emerging contaminants in water:Analysis of pros and cons on health and environment  

作　　者：Sahil Thakur Abhijeet Ojha Sushil Kumar Kansal Navneet Kumar Gupta Hendrik C.Swart Junghyun Cho Andrej Kuznetsov Shuhui Sun Jai Prakash 

机构地区：[1]Department of Chemistry,National Institute of Technology Hamirpur,Hamirpur(H.P.)177005,India [2]Department of Materials Science and Engineering,National Institute of Technology Hamirpur,Hamirpur(H.P.)177005,India [3]Dr.S.S.Bhatnagar University Institute of Chemical Engineering and Technology,Panjab University,Chandigarh 160014,India [4]Center for Sustainable Technologies,Indian Institute of Science(IISc),Gulmohar Marg,Mathikere,Bengaluru 560012,India [5]Department of Physics,University of the Free State(UFS),Bloemfontein,ZA 9300,South Africa [6]Department of Mechanical Engineering&Materials Science and Engineering Program,State University of New York(SUNY),Binghamton,NY 13902-6000,USA [7]University of Oslo,Department of Physics and Centre for Materials Science and Nanotechnology,PO Box 1048 Blindern,N-0316,Oslo,Norway [8]Institut National de la Recherche Scientifique(INRS)-CentreEnergie Materiaux et Telecommunications,Varennes,Quebec J3X 1P7,Canada

出　　处：《Advanced Powder Materials》2024年第6期33-69,共37页先进粉体材料(英文)

基　　金：Council of Scientific and Industrial Research(CSIR),New Delhi for providing Junior Research Fellowship(JRF),Ministry of Education(MoE);New Delhi and National Institute of Technology(NIT),Hamirpur for financial support.

摘　　要：Photocatalysis is an advanced oxidation process where light exposure triggers a semiconducting nanomaterial(nano-photocatalyst)to generate electron-hole(e^(-)/h^(+))pairs and free radicals.This phenomenon is widely used for the photocatalysis-assisted removal of organic and other contaminants using wide range of nanophotocatalysts,offering an efficient approach to environmental remediation.However,the introduction of powdered nano-photocatalysts into water systems often leads to unintended secondary pollution in the form of residual nano-photocatalysts,ion leaching,free radicals,toxic by-products etc.Such practices potentially introduce emerging secondary contaminants into aquatic environments,posing risks to both aquatic life and human health.The resulting chemical by-products and intermediates can effectively induce chronic toxicity,neurological and developmental disorders,cardiovascular defects,and intestinal ailments in humans and aquatic species.Despite having a range of health and environmental consequences,this dark side of nano-photocatalysts has been comparatively less explored and discussed in the literature.In this review,the pros and cons of powder nanophotocatalysts are discussed in view of their advantages as well as disadvantages in wastewater treatment.The discussion encompasses their classification based on composition,dimensions,structure,and activity,as well as recent advancements in improving their photocatalytic efficiency.The article also explores the recent advances on their applications in photocatalytic removal of various water pollutants/contaminants of emerging concern(i.e.,organic pollutants,micro/nano plastics,heavy ions,disinfections,etc.)Furthermore,an emphasis on the role of such nano-photocatalysts as emerging(secondary)contaminants in water system,along with a thorough discussion of latest studies related to the health and environmental issues,has been discussed.Additionally,it addresses critical issues in applying powder nano-photocatalysts for wastewater detoxification and expl

关 键 词：Powder nano-photocatalysts Advanced oxidation processes Wastewater treatment Pros and cons Emerging contaminants Health and environment issues 

分 类 号：X70[环境科学与工程—环境工程]