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Photocatalytic activity and mechanism of bisphenol a removal over TiO2-x/rGO nanocomposite driven by visible light
Xu, L (Xu, Lu);  Yang, L (Yang, Lei);  Johansson, EMJ (Johansson, Erik M. J.);  Wang, YH (Wang, Yuanhao);  Jin, PK (Jin, Pengkang)
2018
发表期刊CHEMICAL ENGINEERING JOURNAL
卷号350期号:10页码:1043-1055
摘要

In the present study, Ti3+ and oxygen vacancies (Ti3+/O-v) self-doped TiO2 and coupled with a reduced graphene oxide (rGO) nanocomposite (TiO2-x/rGO) was successfully synthesized via a facile hydrothermal-calcination method for the efficient degradation of bisphenol A (BPA) under visible light. The results of XPS, ERP and TEM analyses revealed that the presence of Ti3+/O-v in the lattice of TiO2-x/rGO leads to the narrowed band gap and enhanced visible light harvesting. The chemical bonds (TieOeC) between TiO2-x and rGO act as the channel for electron transfer, consequently resulting in the efficient charge separation, which was investigated and confirmed by such methods as PL spectra and time-resolved PL spectra. In addition, the coupling of TiO2-x and rGO could strongly suppress the aggregation of TiO2-x particles and therefore improve the adsorption of organic pollutants. For the synergistic effect of the three preeminent features mentioned above, TiO2-x/rGO exhibited a 6.16-, 2.92-and 2.55-fold faster reaction rate for BPA degradation than that of pristine TiO2, TiO2/rGO and TiO2-x, respectively. Moreover, the effects of the initial substrate concentration, initial solution pH, catalyst dosage and inorganic anions on BPA removal were also investigated in depth. EPR measurements indicated that center dot O-2(-) as the major oxidizing species, is responsible for the degradation of BPA. Next, the feasible pathway of BPA degradation by TiO2-x/rGO was proposed based on the analysis of intermediate products. Finally, the mechanism of the enhanced photocatalytic performance by TiO2-x/rGO under visible light was discussed. Based on these results, the TiO2-x/rGO nanocomposite could be an efficient and promising photocatalyst for the degradation of organic pollutants in water.

关键词Endocrine Disrupting Chemicals Bisphenol a Ti3++ Self-doped Tio2 Tio2-x/rgo Nanocomposite Visible-light Photodegradation Superoxide Radicals
DOI10.1016/j.cej.2018.06.046
收录类别SCI
WOS记录号WOS:000437093000104
引用统计
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/5520
专题环境科学与技术研究室
作者单位1.Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Minist Educ, Key Lab Northwest Water Resources Environm & Ecol, Xian 710055, Shaanxi, Peoples R China
2.Uppsala Univ, Phys Chem, Dept Chem Angstrom, S-75120 Uppsala, Sweden
3.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China
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Xu, L . Photocatalytic activity and mechanism of bisphenol a removal over TiO2-x/rGO nanocomposite driven by visible light[J]. CHEMICAL ENGINEERING JOURNAL,2018,350(10):1043-1055.
APA Xu, L .(2018).Photocatalytic activity and mechanism of bisphenol a removal over TiO2-x/rGO nanocomposite driven by visible light.CHEMICAL ENGINEERING JOURNAL,350(10),1043-1055.
MLA Xu, L ."Photocatalytic activity and mechanism of bisphenol a removal over TiO2-x/rGO nanocomposite driven by visible light".CHEMICAL ENGINEERING JOURNAL 350.10(2018):1043-1055.
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