标题：g-C₃N₄/rectorite as a highly efficient catalyst for peroxymonosulfate activation to remove organic contaminants in water

作者：Longlong Zhu, Pei-jiang Zhou *, Chaoqi Chen *

来源出版物：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 卷10 DOI: 10.1016/j.jece.2022.107168 出版年：2022

摘要：In recent years, modification of graphite carbon nitride (g-C₃N₄) has drawn considerable attention because of its catalytic potential. In this study, rectorite was designed as a carrier for g-C₃N₄, and g-C₃N₄/rectorite was synthesized via pyrolysis under nitrogen protection. The efficiency of g-C₃N₄/rectorite for peroxymonosulfate (PMS) activation was evaluated using acid Orange 7 dye (AO7) as a model organic contaminant. Material characterization suggested the successful synthesis of g-C₃N₄/rectorite. The removal of AO7 was significantly enhanced by the composite, compared to pure g-C₃N₄, rectorite, or their physical mixture. The g-C₃N₄ content in the composite

affected its catalytic ability, while the g-C₃N₄/rectorite with 41% g-C₃N₄ content showed the highest catalytic efficiency. Furthermore, the removal of AO7 was affected by catalyst concentration, oxidant concentration, and solution pH. Notably, under the optimized condition (i.e., 0.8 g/L of g-C₃N₄/rectorite, 0.20 mg/L of PMS, and 6.0 of pH), an initial concentration of 50 mg/L AO7 was removed to a level below the detection limit (i.e., 0.25 mg/L) within 8 min. A recycling test demonstrated the reusability of the g-C₃N₄/rectorite in six repeated reactions. Singlet oxygen played a key role in PMS activation, suggesting that the non-radical degraded process is the dominated AO7 removal pathway. The rectorite has a confined effect preventing g-C₃N₄ from agglomeration, inhibiting the electron-hole recombination, and improve the exposure of active sites such as C-O groups, -OH groups, and pyridinic N. Overall, g-C₃N₄/rectorite is a low-cost and environment-friendly catalyst exhibiting high catalytic activity for PMS activation to remove organic contaminants in water.

作者关键词：g-C₃N₄/rectorite; Peroxymonosulfate; Organic contaminant; Non-radical pathway

地址：[Zhu Longlong; Peijiang Zhou; Chaoqi Chen] School of Resource and Environmental Sciences, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, PR China

通讯作者地址：Pei-jiang Zhou (通讯作者) and Chaoqi Chen (通讯作者), School of Resource and Environmental Sciences, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, PR China

电子邮件地址：zhoupj@whu.edu.cn (P.-j. Zhou), chenchaoqi@whu.edu.cn (C. Chen)

影响因子：5.909