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Gradient graphitic carbon rings induce successive built-in electric field for photo-Fenton-like reaction

Separation and Purification Technology, ISSN: 1383-5866, Vol: 335, Page: 126269
2024
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Article Description

The heterojunction with matched energy band enables efficient peroxymonosulfate (PMS)-based photo-Fenton-like reaction. Nevertheless, the rapid photogenerated charge separation and transfer has been challenging. Herein, we precisely constructed an efficient heterogeneous photo-Fenton-like reactor with successive built-in electric field by gradient doping of coplanar graphitic carbon rings (C gra ) into cobalt tungstate/graphitic carbon nitride (CoWO 4 /GD-CN) heterostructure. The as-prepared CoWO 4 /GD-CN exhibited remarkable enhancement with a tetracycline hydrochloride degradation rate constant (0.776 min −1 ) higher than that of CoWO 4 /CN (0.507 min −1 ). Theoretical and experimental results demonstrated that the successive built-in electric field enhanced by gradient-doped coplanar C gra ring accelerated photogenerated electrons transfer from the innermost to the outmost layer of CoWO 4 /GD-CN. This transfer drove Co(III)/Co(II) conversion for accelerated PMS activation, leading to enhanced degradation reactivity. CoWO 4 /GD-CN had excellent degradability towards representative contaminants, including carbamazepine (1.0 min −1 ), 4-chlorophenol (0.920 min −1 ), sulfamethoxazole (0.90 min −1 ), bisphenol A (0.933 min −1 ), atrazine (0.829 min −1 ), ciprofloxacin (0.589 min −1 ) and norfloxacin (0.617 min −1 ) in CoWO 4 /GD-CN/PMS/vis system, respectively. This work provided a novel insight into the gradient-dope modulated photo-Fenton-like reaction and guided the design of efficient photo-Fenton-like reactor.

Bibliographic Details

Jingjing Jiang; Chenli Yue; Shu Niu; Shengda Liu; Yansong Liu; Lingnan Meng; Bowen Zhao; Yanan Zhang; Zhenhao Zhao; Mingxin Huo; Dandan Zhou; Shuangshi Dong

Elsevier BV

Chemistry; Chemical Engineering

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