文献类型：期刊文献

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

作者：Zhang, Sai[1];Song, Shuang[1];Gu, Pengcheng[1];Ma, Ran[1];Wei, Dongli[1];Zhao, Guixia[1];Wen, Tao[1];Jehan, Riffat[1];Hu, Baowei[2];Wang, Xiangke[1]

机构：[1]North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China;[2]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2019

卷号：7

期号：10

起止页码：5552

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：SCI-EXPANDED(收录号：WOS:000463824300045)、、WOS

基金：We sincerely acknowledge the financial support from the National Key Research and Development Program of China (2017YFA0207002), the NSFC (21607042 and 21577032), and the Fundamental Research Funds for the Central Universities (2018ZD11 and 2017MS045).

语种：英文

外文关键词：Carrier mobility - Catalyst activity - Chemical activation - Light absorption - Phenols - Sulfur compounds - Water pollution

外文摘要：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 780 nm) within 15 min, whose reaction rate (0.317 min(-1)) was approximate to 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.