Roles of iron and manganese in bimetallic biochar composites for efficient persulfate activation and atrazine removal  

作　　者：Yuan Liang Ran Tao Ben Zhao Zeda Meng Yuanyuan Cheng Fan Yang Huihui Lei Lingzhao Kong 

机构地区：[1]School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215000,China. [2]School of Chemistry and Life Sciences,Suzhou University of Science and Technology,Suzhou 215000,China. [3]School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China.

出　　处：《Biochar》2024年第1期731-745,共15页生物炭(英文)

基　　金：supported by the National Natural Science Foundation of China(No.21507097,No.42207479,No.22278419);2022 Gusu Native Talent Program,and Suzhou key technology research(social development)project(2023SS06).

摘　　要：As for Atrazine(C_(8)H_(14)ClN_(5))degradation in soil,iron(Fe)-manganese(Mn)bimetallic biochar composites were proved to be more efficient for persulfate(PS)activation than monometallic ones.The atrazine removal rates of Fe/Mn loaded biochar+PS systems were 2.17-2.89 times higher than Fe/Mn loaded biochar alone.Compared with monometallic biochar,the higher atrazine removal rates by bimetallic biochar(77.2-96.7%)were mainly attributed to the synergy degradation and adsorption due to the larger amounts of metal oxides on the biochar surface.Atrazine degradation in Fe-rich biochar systems was mainly attributed to free radicals(i.e.,SO·−4 and·OH)through oxidative routes,whereas surface-bound radicals,1O2,and free radicals were responsible for the degradation of atrazine in Mn-rich biochar systems.Furthermore,with a higher ratio of Fe(II)and Mn(III)formed in Fe-rich bimetallic biochar,the valence state exchange between Fe and Mn contributed significantly to the more effective activation of PS and the generation of more free radicals.The pathways of atrazine degradation in the Fe-rich bimetallic biochar systems involved alkyl hydroxylation,alkyl oxidation,dealkylation,and dechlorohydroxylation.The results indicated that bimetallic biochar composites with more Fe and less Mn are more effective for the PS-based degradation of atrazine,which guides the ration design of easily available carbon materials targeted for the efficient remediation of various organic-polluted soil.

关 键 词：ATRAZINE Bimetallic biochar composites PERSULFATE RADICALS Non-radicals Degradation pathways 

分 类 号：S15[农业科学—土壤学]