Iron scrap derived nano zero-valent iron/biochar activated persulfate for p-arsanilic acid decontamination with coexisting microplastics  

作　　者：Zihan Shu Hailan Yang Shujing Ye Hong Li Zhiming Yang Chuang Li Xiaofei Tan Shaobo Liu Hou Wang 

机构地区：[1]College of Environmental Science and Engineering,Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University),Ministry of Education,Changsha 410082,China [2]Shenzhen Research Institute of Hunan University,Shenzhen 518055,China [3]School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China [4]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 101408,China [5]School of Architecture and Art,Central South University,Changsha 410083,China [6]School of Metallurgy and Environment,Central South University,Changsha 410083,China

出　　处：《Journal of Environmental Sciences》2025年第5期733-746,共14页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.52200187);Shenzhen Science and Technology Program(No.JCYJ20220530160411025);Guangdong Basic and Applied Basic Research Foundation(No.2024A1515030273);the Provincial Natural Science Foundation of Hunan(No.2023JJ10012);the Provincial Natural Science Foundation of Hunan(No.2023JJ10012).

摘　　要：P-arsanilic acid(AA)has received widespread attention because of its conversion to more toxic inorganic arsenic compounds(arsenate and arsenite)in the natural ecosystems.Its removal process and mechanisms with co-existence of microplastics remain unkown.In this study,biochar loaded with nano zero-valent iron(nZVI)particles(ISBC)was prepared by using iron scrap obtained from a steel works and wood chips collected from a wood processing plant.The advanced oxidation system of sodium persulfate(PDS)activated by ISBC was applied for AA degradation and inorganic arsenic control in aqueous media.More than 99%of the AA was completely degraded by the ISBC/PDS system,and the As(III)on AA was almost completely oxidized to As(V)and finally removed by ISBC.HCO_(3)−inhibited the removal of AA by the ISBC/PDS system,while Cl^(−)had a dual effect that showing inhibition at low concentrations yet promotion at high concentrations.The effect of microplastics on the degradation of AA by the ISBC/PDS system was further investigated due to the potential for combined microplastic and organic arsenic contamination in rural/remote areas.Microplastics were found to have little effect on AA degradation in the ISBC/PDS system,while affect the transport of inorganic arsenic generated from AA degradation.Overall,this study provides new insights and methods for efficient removal of p-arsanilic acid from water with coexisting microplastics.

关 键 词：P-arsanilic acid BIOCHAR Arsenate and arsenite Microplastics 

分 类 号：X70[环境科学与工程—环境工程]