Unravelling superior photodegradation ability and key photoactive structures of hydrochar particle to typical emerging contaminant than corresponding bulk hydrochar from food waste  

作　　者：Wenjing Guo Zhiyong Zhang Yanfang Feng Guodong Fang Shiying He Shaopeng Rong 

机构地区：[1]Key Laboratory of Agro-Environment in Downstream of Yangtze Plain,Ministry of Agriculture and Rural Affairs,Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,People’s Republic of China. [2]Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,People’s Republic of China. [3]Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse,School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,People’s Republic of China.

出　　处：《Biochar》2024年第1期1261-1276,共16页生物炭(英文)

基　　金：supported by the National Natural Science Foundation of China(No.42207276);National Key Research and Development Program of China(2021YFD1700805).

摘　　要：Hydrochar from waste biomass is a promising material for removing emerging contaminants(e.g.,antibiotics)in water/soil environment.Abundant small-sized hydrochar particles(HPs)with a high content of reactive functional groups and high mobility are easily released into ecosystems through hydrochar applications.However,the photodegradation ability and corresponding structures of HPs are largely unknown,which hinder accurate estimation of the remediation effect of hydrochar in ecosystems.Herein,photodegradation performance of HP towards targeted norfloxacin(NOR,a typical antibiotic)under light irradiation(visible and UV light)were investigated after adsorption processes upon release into soil/water,and its reactive species and photoactive structures were clarified and compared with those of residual bulk hydrochar(BH)comprehensively.The results showed that:(1)photodegradation percentages of HPs were 4.02 and 4.48 times higher than those of BHs under UV and visible light,in which reactive species of both HPs and BHs were·OH and·O2−;(2)density functional theory(DFT)results identified that the main photoactive structure of graphitic-N decreased the energy gap(Eg)of HPs,and C=O,COOH groups improved electron donating ability of BHs;(3)well-developed graphitization structure of HP resulted from higher polymerization reaction was an significant photoactive structure involving its superior photodegradation ability relative to that of BH.The distinct heterogeneities of photodegradation ability in HP and BH and underlying photoactive structures provide an in-depth understanding of hydrochar application for removing emerging contaminants in soil/water environment.Identifying photoactive structures is helpful to predict photodegradation ability of hydrochar according to their abundance.

关 键 词：Hydrochar NORFLOXACIN Electron-hole Graphitic-N Density functional theory 

分 类 号：O64[理学—物理化学]