Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane  

作　　者：Jonathan H.Lindhardt Peter E.Holm Yong-Guan Zhu Changyong Lu Hans Christian B.Hansen 

机构地区：[1]Department of Plant and Environmental Sciences,Faculty of Science,University of Copenhagen,Thorvaldsensvej 40,1871 Frederiksberg C,Denmark [2]Key lab of Urban Environment and Health,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [3]Sino-Danish Center for education and research,China and Denmark,Dalgas Avenue 4,DK-8000 Aarhus C.,Denmark

出　　处：《Journal of Environmental Sciences》2025年第1期1-10,共10页环境科学学报(英文版)

摘　　要：Dibromoethane is a widespread,persistent organic pollutant.Biochars are known mediators of reductive dehalogenation by layered Fe^(Ⅱ)-Fe^(Ⅲ)hydroxides(green rust),which can reduce 1,2-dibromoethane to innocuous bromide and ethylene.However,the critical characteristics that determine mediator functionality are lesser known.Fifteen biochar substrates were pyrolyzed at 600℃and 800℃,characterized by elemental analysis,X-ray photo spectrometry C and N surface speciation,X-ray powder diffraction,specific surface area analysis,and tested for mediation of reductive debromination of 1,2-dibromoethane by a green rust reductant under anoxic conditions.A statistical analysis was performed to determine the biochar properties,critical for debromination kinetics and total debromination extent.It was shown that selected plant based biochars can mediate debromination of 1,2-dibromoethane,that the highest first order rate constant was 0.082/hr,and the highest debromination extent was 27%in reactivity experiments with 0.1μmol(20μmol/L)1,2-dibromoethane,≈22 mmol/L Fe^(Ⅱ)GR,and 0.12 g/L soybean meal biochar(7 days).Contents of Ni,Zn,N,and P,and the relative contribution of quinone surface functional groups were significantly(p<0.05)positively correlated with 1,2-dibromoethane debromination,while adsorption,specific surface area,and the relative contribution of pyridinic N oxide surface groups were significantly negatively correlated with debromination.

关 键 词：Environmental remediation BIOCHAR Persistent organic pollutants(POPs) Environmental catalysis Green rust 

分 类 号：X505[环境科学与工程—环境工程]