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

作者: Zhu, LL (Zhu, Longlong); Zhou, PJ (Zhou, Pei-jiang); Chen, CQ (Chen, Chaoqi)

来源出版物: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 卷: 10 期: 2 文献号: 107168 DOI: 10.1016/j.jece.2022.107168 出版年: APR 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.

入藏号: WOS:000788094200002

语言: English

文献类型: Article

作者关键词: G-C (3) N (4); rectorite; Peroxymonosulfate; Organic contaminant; Non-radical pathway

地址: [Zhu, Longlong; Zhou, Pei-jiang; Chen, Chaoqi] Wuhan Univ, Sch Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.

通讯作者地址: Zhou, PJ; Chen, CQ (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Peoples R China.

电子邮件地址: zhoupj@whu.edu.cn; chenchaoqi@whu.edu.cn

影响因子：5.909