標題: Photocatalytic degradation of bisphenol A over a ZnFe2O4/TiO2 nanocomposite under visible light
作者: Thanh Binh Nguyen
Huang, C. P.
Doong, Ruey-an
環境工程研究所
Institute of Environmental Engineering
關鍵字: Visible-light-sensitive;Zinc ferrite (ZnFe2O4);Nanocomposite;Bisphenol A (BPA);Water matrix
公開日期: 1-Jan-2019
摘要: A ZnFe2O4-TiO2 nanocomposite combining p-type ZnFe2O4 and n-type TiO2 was successfully fabricated. The ZnFe2O4-TiO2 nanocomposite greatly enhanced the bisphenol A (BPA) photodegradation under visible light irradiation at 465 +/- 40 nm. Loading TiO2 with 1 wt% of ZnFe2O4 produced high photocurrent and low charge transfer resistance. The photodegradation rate of BPA by ZnFe2O4-TiO2, which was highly dependent on the water chemistry including pH, anions, and humic acid, was 20.8-21.4 times higher than that of commercial TiO2 photocatalysts. Chloride and sulfate ions enhanced BPA photodegradation mostly due to the production of more radical species; whereas nitrate, dihydrogen phosphate, and bicarbonate ions decreased the photodegradation rate of BPA due to the scavenge of hydroxyl radicals. The photoactivity and recyclability of ZnFe2O4-TiO2 in lake water was also assessed. A near complete BPA removal from lake water was observed under visible light irradiation. Furthermore, >90% of photocatalytic activity toward BPA degradation was achieved in 5 cycles of continuous addition of BPA to the lake water. The BPA degradation intermediates were identified by HPLC/MS/MS and possible reaction pathways were proposed. Results clearly demonstrate the excellent visible-light-sensitive photocatalytic degradation of BPA over ZnFe2O4-TiO2 composite which has a great application potential for the decomposition of emerging contaminants in impaired waters. (c) 2018 Published by Elsevier B.V.
URI: http://dx.doi.org/10.1016/j.scitotenv.2018.07.352
http://hdl.handle.net/11536/148177
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2018.07.352
期刊: SCIENCE OF THE TOTAL ENVIRONMENT
Volume: 646
起始頁: 745
結束頁: 756
Appears in Collections:Articles