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

Journal: Journal of environmental sciences (China)
Published Date: Nov 6, 2020

Abstract

In order to enhance the removal performance of graphitic carbon nitride (g-CN) on organic pollutant, a simultaneous process of adsorption and photocatalysis was achieved via the compounding of biochar and g-CN. In this study, g-CN was obtained by a condensation reaction of melamine at 550°C. Then the g-CN/biochar composites were synthesized by ball milling biochar and g-CN together, which was considered as a simple, economical, and green strategy. The characterization of resulting g-CN/biochar suggested that biochar and g-CN 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-CN/biochar composites displayed higher adsorption and photocatalytic performance to EFA than that of pure g-CN. The 50% g-CN/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-CN were 19.0% and 27.3%, respectively. Besides, 50% g-CN/biochar showed the highest total organic carbon (TOC) removal efficiency (65.9%). Radical trapping experiments suggested that superoxide radical (•O) 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.

Authors

  • Yao Xiao
    School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China; 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.
  • Honghong Lyu
    School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China; School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China. Electronic address: honghonglyu@hebut.edu.cn.
  • Chengliang Yang
    BCIG Environmental Remediation Co., Ltd, Tianjin 300042, China.
  • Beibei Zhao
    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.
  • Lan Wang
    The Center of Psychosomatic Medicine, Sichuan Provincial Center for Mental Health, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu 611731, China.
  • Jingchun Tang
    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. Electronic address: tangjch@nankai.edu.cn.

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