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Insights into the synergetic mechanism of a combined vis-RGO/TiO2/peroxodisulfate system for the degradation of PPCPs: Kinetics, environmental factors and products.
Chemosphere. 2019 Feb; 216:341-351.C

Abstract

In recent years, how to effectively remove emerging organic pollutants in water bodies has been studied extensively, especially in the actual complex water environment. In the present study, an effective wastewater treatment system that combined photocatalysis and an oxidizing agent was investigated. Specifically, visible-light driven reduced graphene oxide (RGO)/TiO2 composites were prepared, and peroxodisulfate (PDS) was used as electron acceptor to accelerate the photocatalytic activity of this material. The vis-RGO/TiO2/PDS system exhibited outstanding properties in the degradation of diclofenac (DCF), which was also facilitated by acidic conditions and Cl-. Lake water, tap water, river water and HCO3- decreased the DCF degradation rate, while NO3- affected the system only slightly. Low concentrations of fulvic acid (FA) promoted the degradation of DCF via the generation of excited states, whereas a high concentration of FA inhibited the degradation, which was likely due to the light screening effect. The photocatalytic mechanism revealed that PDS served as an electron acceptor for the promotion of electron-hole pair separation and the generation of additional reactive oxygen species, while the RGO served as an electric conductor. The active substances, h+, OH, 1O2, SO4- and O2- were generated in this system, O2- and h+ played significant roles in the degradation of DCF based electron spin resonance tests and radical quenching results. According to the mass spectrometry results, the amide bond cleavage, dechlorination reaction, hydroxyl addition reaction, and decarboxylation reaction were the primary transformative pathways.

Authors+Show Affiliations

School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China; School of Environment, Tsinghua University, Beijing, 100084, China.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.School of Environment, Tsinghua University, Beijing, 100084, China.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Xinxiang, 453007, China.Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, China.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China; State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Hong Kong, China.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China. Electronic address: liugg615@163.com.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China. Electronic address: lvwy612@163.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30384303

Citation

Chen, Ping, et al. "Insights Into the Synergetic Mechanism of a Combined vis-RGO/TiO2/peroxodisulfate System for the Degradation of PPCPs: Kinetics, Environmental Factors and Products." Chemosphere, vol. 216, 2019, pp. 341-351.
Chen P, Zhang Q, Shen L, et al. Insights into the synergetic mechanism of a combined vis-RGO/TiO2/peroxodisulfate system for the degradation of PPCPs: Kinetics, environmental factors and products. Chemosphere. 2019;216:341-351.
Chen, P., Zhang, Q., Shen, L., Li, R., Tan, C., Chen, T., Liu, H., Liu, Y., Cai, Z., Liu, G., & Lv, W. (2019). Insights into the synergetic mechanism of a combined vis-RGO/TiO2/peroxodisulfate system for the degradation of PPCPs: Kinetics, environmental factors and products. Chemosphere, 216, 341-351. https://doi.org/10.1016/j.chemosphere.2018.10.096
Chen P, et al. Insights Into the Synergetic Mechanism of a Combined vis-RGO/TiO2/peroxodisulfate System for the Degradation of PPCPs: Kinetics, Environmental Factors and Products. Chemosphere. 2019;216:341-351. PubMed PMID: 30384303.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Insights into the synergetic mechanism of a combined vis-RGO/TiO2/peroxodisulfate system for the degradation of PPCPs: Kinetics, environmental factors and products. AU - Chen,Ping, AU - Zhang,Qianxin, AU - Shen,Lingzhi, AU - Li,Ruobai, AU - Tan,Cuiwen, AU - Chen,Tiansheng, AU - Liu,Haijin, AU - Liu,Yang, AU - Cai,Zongwei, AU - Liu,Guoguang, AU - Lv,Wenying, Y1 - 2018/10/22/ PY - 2018/08/22/received PY - 2018/10/01/revised PY - 2018/10/16/accepted PY - 2018/11/2/pubmed PY - 2019/1/19/medline PY - 2018/11/2/entrez KW - Environmental factors KW - Mechanism KW - Peroxodisulfate KW - Photocatalysis SP - 341 EP - 351 JF - Chemosphere JO - Chemosphere VL - 216 N2 - In recent years, how to effectively remove emerging organic pollutants in water bodies has been studied extensively, especially in the actual complex water environment. In the present study, an effective wastewater treatment system that combined photocatalysis and an oxidizing agent was investigated. Specifically, visible-light driven reduced graphene oxide (RGO)/TiO2 composites were prepared, and peroxodisulfate (PDS) was used as electron acceptor to accelerate the photocatalytic activity of this material. The vis-RGO/TiO2/PDS system exhibited outstanding properties in the degradation of diclofenac (DCF), which was also facilitated by acidic conditions and Cl-. Lake water, tap water, river water and HCO3- decreased the DCF degradation rate, while NO3- affected the system only slightly. Low concentrations of fulvic acid (FA) promoted the degradation of DCF via the generation of excited states, whereas a high concentration of FA inhibited the degradation, which was likely due to the light screening effect. The photocatalytic mechanism revealed that PDS served as an electron acceptor for the promotion of electron-hole pair separation and the generation of additional reactive oxygen species, while the RGO served as an electric conductor. The active substances, h+, OH, 1O2, SO4- and O2- were generated in this system, O2- and h+ played significant roles in the degradation of DCF based electron spin resonance tests and radical quenching results. According to the mass spectrometry results, the amide bond cleavage, dechlorination reaction, hydroxyl addition reaction, and decarboxylation reaction were the primary transformative pathways. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/30384303/Insights_into_the_synergetic_mechanism_of_a_combined_vis_RGO/TiO2/peroxodisulfate_system_for_the_degradation_of_PPCPs:_Kinetics_environmental_factors_and_products_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)31957-X DB - PRIME DP - Unbound Medicine ER -