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-exis...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.展开更多
基金supported by the National Natural Science Foundation of China(No.52200187)Shenzhen Science and Technology Program(No.JCYJ20220530160411025)+2 种基金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).
文摘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.
