期刊
ENVIRONMENTAL POLLUTION
卷 232, 期 -, 页码 580-590出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2017.09.094
关键词
Titanate nanotubes; TiO2; Photocatalysis; Bisphenol A; Easy-setting; OFT calculation
资金
- National Natural Science Foundation of China [51508006]
- General Financial Grant from the China Postdoctoral Science Foundation [2016M601056]
- Fudan University [JIH1829022]
Bisphenol A (BPA) is a widely concerned endocrine disrupting chemical and hard to be removed through conventional wastewater treatment processes. In this study, we developed a TiO2 decorated titanate nanotubes composite (TiO2/TNTs) and used for photocatalytic degradation of BPA. TEM and XRD analysis show that the TiO2/TNTs is a nano-composite of anatase and titanate, with anatase acting as the primary photocatalytic site and titanate as the skeleton. TiO2/TNTs exhibited excellent photocatalytic reactivity and its easy-settling property leaded to good reusability. After 5 reuse cycles, TiO2/TNTs also could photo degrade 91.2% of BPA with a high rate constant (k(1)) of 0.039 min(-1), which was much better than TiO2 and TNTs. Higher pH facilitated photocatalysis due to more reactive oxygen species produced and less material aggregation. The presence of NaCl and CaCl2 showed negligible effects on BPA degradation, but NaHCO3 caused an inhibition effect resulting from consumption of center dot OH. Humic acid inhibited degradation mainly due to blockage of the active sites of TiO2/TNTs. Degradation pathway was well interpreted through theoretical calculation. Hydroxyl radical played the dominate role in BPA photodegradation, and the atoms of BPA with high Fukui index based on density-functional theory (DFT) calculation are the radical easy-attacking (f(0)) sites. Considering the good photocatalytic reactivity, reusability, stability and settle property, TiO2/TNTs promises to be an efficient alternative for removal of organic compounds from wastewaters. (C) 2017 Elsevier Ltd. All rights reserved.
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