A green strategy for porous biochar fabrication with superior capacity for peroxydisulfate activation to degrade sulfadiazine:the cooperative role of C-sp^(3) and specific surface area  

作　　者：Shulian Wang Yan Huang Shuanglong Ma Sihui Zhan Jingzhen Wang Boqiang Gao Xiaodan Tang Qiuhui Zhu Shengjun Xu Xuliang Zhuang 

机构地区：[1]College of Resources and Environmental Sciences,Henan Agricultural University,Zhengzhou 450002,People’s Republic of China [2]Key Laboratory of Pollution Processes and Environmental Criteria(Ministry of Education),College of Environmental Science and Engineering,Nankai University,Tianjin 300071,People’s Republic of China [3]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,18 Shuangqing Road,Haidian District,Beijing 100085,People’s Republic of China

出　　处：《Biochar》2023年第1期419-436,共18页生物炭（英文）

基　　金：Youth Program of National Natural Science Foundation of China(41907150);Special Fund for Topnotch Talents in Henan Agricultural University(30500600);Open Project of Key Laboratory of Environmental Biotechnology,CAS(kf2021001).

摘　　要：Metal-free porous biochars are popularly utilized as catalysts for peroxydisulfate(PDS)activation.The enhancement effect of PDS activation of porous biochars fabricated by employing both hard template and alkali metal activating agent has not been explored completely.In addition,the role of the inherent carbon defect in PDS activation has not been clearly elucidated.Hence,a series of carbonaceous catalysts were fabricated using a sole template(KCl),a sole activating agent(Na_(2)S_(2)O_(3))or a combination of template and activating agent(KCl/Na_(2)S_(2)O_(3),KCl/KHCO_(3),KCl/NaHCO_(3),and KCl/Na_(2)C_(2)O_(4)),to systematically investigate the effect of specific surface area(SSA)and intrinsic defect of porous biochar on its PDS activation ability.The biochar synthesized by KCl and Na_(2)S_(2)O_(3)(SK-C)exhibited the optimum degradation performance.The SK-C was found to possess an interconnected hollow cage with three-dimensional mesh structure showing the largest surface area,pore volume and C-sp^(3) edge defect content among all the catalysts,which explained its paramount catalytic ability.The SSA and C-sp^(3) content together can determine the catalytic performance in a quantitative relationship.The single electron transfer pathway from SDZ to inner-sphere bound SK-C/PDS*was the protagonist of pollutant oxidation.The degradation intermediates were detected and recognized and their toxicities were evaluated.This study for the first time comprehensively identified the synergistic effect between the SSA and inherent defects on improving the catalytic performance of biochar for PDS activation to removal contaminants.

关 键 词：BIOCHAR C-sp^(3)edge defects PEROXYDISULFATE Electron transfer pathway Organic pollutants Degradation 

分 类 号：O643.36[理学—物理化学]