Issue 10, 2019

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

Abstract

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[triple bond, length as m-dash]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[triple bond, length as m-dash]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.

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

Supplementary files

Article information

Article type
Paper
Submitted
10 Jan 2019
Accepted
05 Feb 2019
First published
05 Feb 2019

J. Mater. Chem. A, 2019,7, 5552-5560

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

S. Zhang, S. Song, P. Gu, R. Ma, D. Wei, G. Zhao, T. Wen, R. Jehan, B. Hu and X. Wang, J. Mater. Chem. A, 2019, 7, 5552 DOI: 10.1039/C9TA00339H

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