首页|Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane
Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane
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Plant-substrate biochar properties critical for mediating reductive debromination of 1,2-dibromoethane
Dibromoethane is a widespread,persistent organic pollutant.Biochars are known mediators of reductive dehalogenation by layered FeⅡ-FeⅢ hydroxides(green rust),which can reduce 1,2-dibromoethane to innocuous bromide and ethylene.However,the critical characteris-tics that determine mediator functionality are lesser known.Fifteen biochar substrates were pyrolyzed at 600 ℃ and 800 ℃,characterized by elemental analysis,X-ray photo spectrom-etry 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 0.1 μmol(20 μmol/L)1,2-dibromoethane,≈ 22 mmol/L FeⅡGR,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.
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