标題: Peroxymonosulfate enhanced photocatalytic degradation of Reactive Black 5 by ZnO-GAC: Key influencing factors, stability and response surface approach

作者: Liu, FZ (Liu, Fuzhen); Wang, X (Wang, Xue); Liu, ZZ (Liu, Zhengzhi); Miao, F (Miao, Fei); Xu, Y (Xu, Yin); Zhang, H (Zhang, Hui)

來源出版物: SEPARATION AND PURIFICATION TECHNOLOGY 卷: 279 文獻号: 119754 DOI: 10.1016/j.seppur.2021.119754 出版年: DEC 15 2021

摘要: Zinc oxide supported on granular activated carbon (ZnO-GAC) was synthesized for the photocatalysis of Reactive Black 5 (RB5) with the presence of peroxymonosulfate (PMS). RB5 removal was improved with increasing temperature and dosage of PMS or catalyst, but declined with increasing pH and RB5 concentration. The reaction followed first-order kinetic model and the activation energy was determined to be 16.15 kJ mol(-1). After 60 min treatment, 43.6% of TOC was removed and further extending the reaction time to 90 min resulted in 51.9% TOC removal. The evolution profile of ammonium and nitrate ions was monitored during the treatment, and the organic degradation products of RB5 oxidation were identified by LC-MS analysis with a plausible degradation pathway being proposed. Quenching experiments indicated that electron hole (h(+)) and reactive radicals (e.g. HO center dot/SO4 center dot-) were mainly responsible for RB5 removal in the UV/ZnO-GAC/PMS system. The catalyst reuse experiment shows that ZnO-GAC had no obvious deactivation after four cycles, which implied the reusability and stability of the prepared catalyst. Response surface methodology (RSM) with Box-Behnken design (BBD) was used to evaluate the effect of operating conditions, including PMS concentration, reaction temperature and initial pH on the removal rate of RB5. The result of adequacy check indicated the proposed RSM model was reliable and accurate to analyze the operating parameters of the UV/ZnO-GAC/PMS system.

作者關鍵詞: Reactive Black 5; Peroxymonosulfate; Zinc oxide; Photolysis; Response surface methodology

地址: [Liu, Fuzhen; Wang, Xue; Liu, Zhengzhi; Miao, Fei; Xu, Yin; Zhang, Hui] Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan 430079, Peoples R China.

[Liu, Fuzhen; Xu, Yin] Hubei Univ, Fac Resources & Environm Sci, Hubei Key Lab Reg Dev & Environm Response, Wuhan 430062, Peoples R China.

通訊作者地址: Xu, Y; Zhang, H (通訊作者)，Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan 430079, Peoples R China.

電子郵件地址: yxu1101@163.com; eeng@whu.edu.cn

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