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Enhanced activation of peroxymonosulfate by nitrogen-doped graphene/TiO2 under photo-assistance for organic pollutants degradation: Insight into N doping mechanism.
Chemosphere. 2020 Apr; 244:125526.C

Abstract

Production of sulfate radical from peroxymonosulfate (PMS) activation by carbon-based catalysts is a promising strategy to degrade pollutants. However, the electron-transfer ability of carbon catalysts, which is critical in PMS activation, still needs to be improved. In this study, a novel photo-assisted PMS activation system (PPAS) was constructed on a nitrogen-doped graphene/TiO2 (NG/TiO2), in which the photogenerated electrons excited from TiO2 could be utilized by NG for enhanced PMS activation on it. Moreover, the N content was varied to firstly investigate the role of N doping on PPAS. Under photo-assistance, the NG/TiO2 displayed significantly enhanced PMS activation for removal of organic pollutants. 100% bisphenol A (BPA) can be removed within 1 h. The results show that the degradation kinetic constant of BPA by the NG/TiO2 PPAS was 24 times higher than that under PMS alone, and was 1.4 times higher than that of rGO/TiO2 PPAS. The singlet oxygen (1O2) and sulfate radical (SO4-) were the main reactive species in PPAS. The outstanding performance of NG/TiO2 system was ascribed to the two main reasons: on one hand, the N doping decreased the schottky barrier formed between NG and TiO2, which favored the electron transfer from TiO2 to NG. On the other hand, the N doping enhanced the adsorption and electron-transfer ability of NG towards PMS.

Authors+Show Affiliations

School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China.School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China. Electronic address: wanggl@dlpu.edu.cn.School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China.School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China.School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, 116034, China. Electronic address: zhangxf@dlpu.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31821928

Citation

Zhao, Ya, et al. "Enhanced Activation of Peroxymonosulfate By Nitrogen-doped graphene/TiO2 Under Photo-assistance for Organic Pollutants Degradation: Insight Into N Doping Mechanism." Chemosphere, vol. 244, 2020, p. 125526.
Zhao Y, Wang G, Li L, et al. Enhanced activation of peroxymonosulfate by nitrogen-doped graphene/TiO2 under photo-assistance for organic pollutants degradation: Insight into N doping mechanism. Chemosphere. 2020;244:125526.
Zhao, Y., Wang, G., Li, L., Dong, X., & Zhang, X. (2020). Enhanced activation of peroxymonosulfate by nitrogen-doped graphene/TiO2 under photo-assistance for organic pollutants degradation: Insight into N doping mechanism. Chemosphere, 244, 125526. https://doi.org/10.1016/j.chemosphere.2019.125526
Zhao Y, et al. Enhanced Activation of Peroxymonosulfate By Nitrogen-doped graphene/TiO2 Under Photo-assistance for Organic Pollutants Degradation: Insight Into N Doping Mechanism. Chemosphere. 2020;244:125526. PubMed PMID: 31821928.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced activation of peroxymonosulfate by nitrogen-doped graphene/TiO2 under photo-assistance for organic pollutants degradation: Insight into N doping mechanism. AU - Zhao,Ya, AU - Wang,Guanlong, AU - Li,Lujie, AU - Dong,Xiaoli, AU - Zhang,Xiufang, Y1 - 2019/12/03/ PY - 2019/09/27/received PY - 2019/11/27/revised PY - 2019/11/30/accepted PY - 2019/12/11/pubmed PY - 2020/3/24/medline PY - 2019/12/11/entrez KW - Bisphenol A KW - Nitrogen doped graphene KW - Peroxymonosulfate activation KW - Photo-assistance KW - TiO(2) SP - 125526 EP - 125526 JF - Chemosphere JO - Chemosphere VL - 244 N2 - Production of sulfate radical from peroxymonosulfate (PMS) activation by carbon-based catalysts is a promising strategy to degrade pollutants. However, the electron-transfer ability of carbon catalysts, which is critical in PMS activation, still needs to be improved. In this study, a novel photo-assisted PMS activation system (PPAS) was constructed on a nitrogen-doped graphene/TiO2 (NG/TiO2), in which the photogenerated electrons excited from TiO2 could be utilized by NG for enhanced PMS activation on it. Moreover, the N content was varied to firstly investigate the role of N doping on PPAS. Under photo-assistance, the NG/TiO2 displayed significantly enhanced PMS activation for removal of organic pollutants. 100% bisphenol A (BPA) can be removed within 1 h. The results show that the degradation kinetic constant of BPA by the NG/TiO2 PPAS was 24 times higher than that under PMS alone, and was 1.4 times higher than that of rGO/TiO2 PPAS. The singlet oxygen (1O2) and sulfate radical (SO4-) were the main reactive species in PPAS. The outstanding performance of NG/TiO2 system was ascribed to the two main reasons: on one hand, the N doping decreased the schottky barrier formed between NG and TiO2, which favored the electron transfer from TiO2 to NG. On the other hand, the N doping enhanced the adsorption and electron-transfer ability of NG towards PMS. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/31821928/Enhanced_activation_of_peroxymonosulfate_by_nitrogen_doped_graphene/TiO2_under_photo_assistance_for_organic_pollutants_degradation:_Insight_into_N_doping_mechanism_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)32766-3 DB - PRIME DP - Unbound Medicine ER -