Journal
CHEMICAL ENGINEERING JOURNAL
Volume 352, Issue -, Pages 412-422Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.07.038
Keywords
Z-scheme g-C3N4@ZnO; Atomic layer deposition; Cephalexin degradation; Oxidation potential; Simulated sunlight irradiation
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Funding
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2017DX02]
- Applied Technology Research and Development Program of Harbin [2017AB4AS035]
- China Scholarship Council [201706120265]
- National Natural Science Foundation of China [51708157]
- Harbin Youth Talent Support Program [2017RAQXJ230]
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In this study, a newly-designed Z-scheme g-C3N4@ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C3N4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C3N4@ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C3N4@ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min(-1), 5.4 and 8.1 times higher than that of pure g-C3N4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C3N4@ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C3N4@ZnO. Besides, the oxidative species, especially h(+) and center dot OHplayed significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C3N4@ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light
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