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Photocatalytic removal of organic phosphate esters by TiO2: Effect of inorganic ions and humic acid.
Chemosphere. 2018 Sep; 206:26-32.C

Abstract

In this study, the TiO2-mediated photocatalytic removal of organic phosphate esters (OPEs) under UV irradiation was investigated. In addition, the effects of selected inorganic ions and humic acid (HA) were examined. TCEP, TCPP, and TDCPP hardly undergo degradation via photolysis, and TiO2-mediated photocatalysis was confirmed to be effective for removing OPEs present in a water matrix. Inorganic ions (e.g., PO43-, SO42-, Cl-, and NO3-) and HA inhibited the degradation of OPEs. Among these selected ions, PO43- exhibited the strongest inhibition ability, followed by SO42- and then Cl- and NO3-, and the inhibition effect increased with the ion concentration. The inhibition effect was caused by two main reasons: (1) Inorganic ions or HA served as ·OH scavengers and competed with OPEs for ·OH. (2) On account of the adsorption of inorganic ions and HA on TiO2, the available surface-active sites for OPEs decreased, followed by their oxidation with surface-bound ·OH. The ·OH concentrations were measured by electron spin resonance and the probe method, and it was positively correlated to the degradation rate of OPEs. This study emphasized the importance of inorganic species and HA on the photocatalytic degradation of OPEs and clarified the inhibition mechanism for the degradation of OPEs by the inorganic species or HA.

Authors+Show Affiliations

School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou 510006, China. Electronic address: gnlu@foxmail.com.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29723749

Citation

Tang, Ting, et al. "Photocatalytic Removal of Organic Phosphate Esters By TiO2: Effect of Inorganic Ions and Humic Acid." Chemosphere, vol. 206, 2018, pp. 26-32.
Tang T, Lu G, Wang W, et al. Photocatalytic removal of organic phosphate esters by TiO2: Effect of inorganic ions and humic acid. Chemosphere. 2018;206:26-32.
Tang, T., Lu, G., Wang, W., Wang, R., Huang, K., Qiu, Z., Tao, X., & Dang, Z. (2018). Photocatalytic removal of organic phosphate esters by TiO2: Effect of inorganic ions and humic acid. Chemosphere, 206, 26-32. https://doi.org/10.1016/j.chemosphere.2018.04.161
Tang T, et al. Photocatalytic Removal of Organic Phosphate Esters By TiO2: Effect of Inorganic Ions and Humic Acid. Chemosphere. 2018;206:26-32. PubMed PMID: 29723749.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic removal of organic phosphate esters by TiO2: Effect of inorganic ions and humic acid. AU - Tang,Ting, AU - Lu,Guining, AU - Wang,Wenjing, AU - Wang,Rui, AU - Huang,Kaibo, AU - Qiu,Zhiyuan, AU - Tao,Xueqin, AU - Dang,Zhi, Y1 - 2018/04/30/ PY - 2017/12/23/received PY - 2018/04/20/revised PY - 2018/04/27/accepted PY - 2018/5/4/pubmed PY - 2018/8/29/medline PY - 2018/5/4/entrez KW - Humic acid KW - Hydroxyl radical KW - Ions species KW - Kinetic KW - Organic phosphate esters KW - TiO(2) SP - 26 EP - 32 JF - Chemosphere JO - Chemosphere VL - 206 N2 - In this study, the TiO2-mediated photocatalytic removal of organic phosphate esters (OPEs) under UV irradiation was investigated. In addition, the effects of selected inorganic ions and humic acid (HA) were examined. TCEP, TCPP, and TDCPP hardly undergo degradation via photolysis, and TiO2-mediated photocatalysis was confirmed to be effective for removing OPEs present in a water matrix. Inorganic ions (e.g., PO43-, SO42-, Cl-, and NO3-) and HA inhibited the degradation of OPEs. Among these selected ions, PO43- exhibited the strongest inhibition ability, followed by SO42- and then Cl- and NO3-, and the inhibition effect increased with the ion concentration. The inhibition effect was caused by two main reasons: (1) Inorganic ions or HA served as ·OH scavengers and competed with OPEs for ·OH. (2) On account of the adsorption of inorganic ions and HA on TiO2, the available surface-active sites for OPEs decreased, followed by their oxidation with surface-bound ·OH. The ·OH concentrations were measured by electron spin resonance and the probe method, and it was positively correlated to the degradation rate of OPEs. This study emphasized the importance of inorganic species and HA on the photocatalytic degradation of OPEs and clarified the inhibition mechanism for the degradation of OPEs by the inorganic species or HA. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/29723749/Photocatalytic_removal_of_organic_phosphate_esters_by_TiO2:_Effect_of_inorganic_ions_and_humic_acid_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)30816-6 DB - PRIME DP - Unbound Medicine ER -
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