Visible-light-driven activation of persulfate over cyano and hydroxyl group co-modified mesoporous g-C3N4 for boosting bisphenol A degradation

In this work, structure-deficient mesoporous g-C3N4 (DMCN) was fabricated via a facile hard template approach with water-bath aging pretreatment. The in situ introduced cyano groups (–C≡N) and hydroxyl groups (–OH) effectively modulated the energy levels, improved visible light absorption, and meanw...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (10), p.5552-5560
Main Authors: Zhang, Sai, Song, Shuang, Gu, Pengcheng, Ma, Ran, Wei, Dongli, Zhao, Guixia, Wen, Tao, Riffat Jehan, Hu, Baowei, Wang, Xiangke
Format: Article
Language:English
Subjects:
Activation
Aging
Bisphenol A
Carbon nitride
Catalysis
Catalytic activity
Charge transfer
Current carriers
Cyano groups
Degradation
Electromagnetic absorption
Energy levels
Hydroxyl groups
Light levels
Oxidation
Phenols
Pretreatment
Pretreatment of water
Quantum efficiency
Sulfate
Water pollution
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Summary:In this work, structure-deficient mesoporous g-C3N4 (DMCN) was fabricated via a facile hard template approach with water-bath aging pretreatment. The in situ introduced cyano groups (–C≡N) and hydroxyl groups (–OH) effectively modulated the energy levels, improved visible light absorption, and meanwhile served as strong electron-withdrawing groups, promoting the efficient separation and transfer of photogenerated charge carriers. With the addition of persulfate (PS) as an oxidant, DMCN exhibited superior catalytic activity and stability for bisphenol A (BPA) degradation. 100% BPA could be degraded for optimal DMCN-3.5 with 0.5 g L−1 catalyst and 1.0 g L−1 PS under visible light (420 nm ≤ λ ≤ 780 nm) within 15 min, whose reaction rate (0.317 min−1) was ∼39.6 times higher than that of bulk g-C3N4 (0.008 min−1). Based on EPR and quenching tests, h+ and SO4·− radicals were determined as major oxidizing species in the DMCN/PS/Vis system. The enhanced catalytic performance was mainly attributed to PS serving as the electron acceptor and transfer of photogenerated e− to PS via –C≡N and C–OH groups, resulting in the efficient activation of PS for SO4·− and a high light quantum efficiency. This work gives novel insights into in situ defect engineering for g-C3N4 and offers a new chance for visible-light-induced sulfate radical-based Fenton-like system to govern contaminated water.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta00339h