Photoactivation of peroxymonosulfate by wood pulp cellulose biochar/g-C_(3)N_(4)composite for diclofenac degradation:the radical and nonradical pathways  

作　　者：Yu Han Lu Gan Han Gong Jiangang Han Weichuan Qiao Lijie Xu 

机构地区：[1]College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,Jiangsu,People’s Republic of China [2]College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,People’s Republic of China [3]Joint Laboratory of Guangdong Province and Hong Kong Region On Marine Bioresource Conservation and Exploitation,College of Marine Sciences,South China Agricultural University,Guangzhou 510642,People’s Republic of China [4]Co-Innovation Center for the Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing 210037,Jiangsu,China [5]National Positioning Observation Station of Hung-Tse Lake Wetland Ecosystem in Jiangsu Province,Hongze 223100,Jiangsu,China

出　　处：《Biochar》2022年第1期596-614,共19页生物炭（英文）

基　　金：China Postdoctoral Science Foundation(Grant No.2019 M661856);Qing Lan Project of Jiangsu Province(Grant No.2020);Natural Science Foundation of Jiangsu Province,China(Grant No.BK20201385);National Key Research and Development Project(Grant No.2017YFC0505803);National Natural Science Foundation of China(NSFC)(Grant No.41977354).

摘　　要：Metal-free photocatalysts have attracted growing concern recently.Herein,the composites combining g-C_(3)N_(4)with wood pulp cellulose biochar(WPBC/g-C_(3)N_(4))were synthesized to effectively activate peroxymonosulfate(PMS)under visible light for the degradation of diclofenac(DCF).The incorporation of WPBC endowed g-C_(3)N_(4)with enhanced visible light absorption,improved charge separation capability,reduced electrical conductivity,and increased photocatalytic and PMS activation capability.Based on quenching tests,electron paramagnetic resonance(EPR),electrochemical analysis and solvent exchange experiments,both radical and nonradical mechanisms were proposed.Radical species including·OH,h^(+),·O_(2)^(-)were identified to contribute to DCF degradation.The 1O2 and electron transfer were the dominant nonradical pathways for DCF degradation.Moreover,the common influencing factors were examined,and DCF concentration was the most influential factor based on principal component analysis.Generally,the composites exhibited good reusability during consecutive runs.Based on HPLC/MS analysis,four intermediates were detected and the possible DCF degradation pathway was proposed.This work provided a potential strategy based on metal-free WPBC/g-C_(3)N_(4)for the photocatalytic activation of PMS to effectively degrade emerging contaminants in wastewater.

关 键 词：DICLOFENAC Wood pulp cellulose g-C_(3)N_(4) PEROXYMONOSULFATE BIOCHAR 

分 类 号：TB33[一般工业技术—材料科学与工程]