Graphitic carbon nitride/biochar composite synthesized by a facile ball-milling method for the adsorption and photocatalytic degradation of enrofloxacin  

作　　者：Yao Xiao Honghong Lyu Chengliang Yang Beibei Zhao Lan Wang Jingchun Tang 

机构地区：[1]School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China [2]School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China [3]Key Laboratory of Pollution Processes and Environmental Criteria(Ministry of Education),Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation,College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China [4]BCIG Environmental Remediation Co.,Ltd,Tianjin 300042,China

出　　处：《Journal of Environmental Sciences》2021年第5期93-107,共15页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41807363 and U1806216);National Key R&D Program of China(No.2018YFC1802002);Hebei Outstanding Youth Science Foundation(No.D2019202453);China Postdoctoral Science Foundation(No.2019M660967);111 program,Ministry of Education,China(No.T2017002)。

摘　　要：In order to enhance the removal performance of graphitic carbon nitride(g-C_(3)N_(4)) on organic pollutant, a simultaneous process of adsorption and photocatalysis was achieved via the compounding of biochar and g-C_(3)N_(4). In this study, g-C_(3)N_(4) was obtained by a condensation reaction of melamine at 550 °C. Then the g-C_(3)N_(4)/biochar composites were synthesized by ball milling biochar and g-C_(3)N_(4) together, which was considered as a simple, economical, and green strategy. The characterization of resulting g-C_(3)N_(4)/biochar suggested that biochar and g-C_(3)N_(4) achieved effective linkage. The adsorption and photocatalytic performance of the composites were evaluated with enrofloxacin(EFA) as a model pollutant. The result showed that all the g-C_(3)N_(4)/biochar composites displayed higher adsorption and photocatalytic performance to EFA than that of pure g-C_(3)N_(4). The 50% g-C_(3)N_(4)/biochar performed best and removed 45.2% and 81.1% of EFA(10 mg/L) under darkness and light with a dosage of 1 mg/mL, while g-C_(3)N_(4) were 19.0% and 27.3%, respectively. Besides, 50% g-C_(3)N_(4)/biochar showed the highest total organic carbon(TOC) removal efficiency(65.9%). Radical trapping experiments suggested that superoxide radical( ·O_(2)^(-)) and hole(h~+) were the main active species in the photocatalytic process. After 4 cycles, the composite still exhibited activity for catalytic removal of EFA.

关 键 词：BIOCHAR g-C_(3)N_(4) Ball milling ADSORPTION PHOTOCATALYSIS 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程] TQ426