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Title: Mechanism and experimental study on the photocatalytic performance of Ag/AgCl @ chiral TiO2 nanofibers photocatalyst: The impact of wastewater components
Authors: Wang, Dawei
Li, Yi
Li Puma, Gianluca
Wang, Chao
Wang, Peifang
Zhang, Wenlong
Wang, Qing
Keywords: Wastewater components
Ag
AgCl
Photocatalytic performance
Transformation
Issue Date: 2015
Citation: WANG, D. ...et al., 2015. Mechanism and experimental study on the photocatalytic performance of Ag/AgCl @ chiral TiO2 nanofibers photocatalyst: The impact of wastewater components. Journal of Hazardous Materials, 285, pp. 277-284.
Abstract: © 2014 Elsevier B.V.The effect of the water matrix components of a secondary effluent of a urban wastewater treatment plant on the photocatalytic activity of Ag/AgCl @ chiral TiO2 nanofibers and the undergoing reaction mechanisms were investigated. These effects were evaluated through the water components-induced changes on the net rate of hydroxyl radical (•OH) generation and modeled using a relative rate technique. Dissolved organic matter DOM (k=-2.8×108M-1s-1) scavenged reactive oxygen species, Cl- (k=-5.3×108M-1s-1) accelerated the transformation from Ag to AgCl (which is not photocatalytically active under visible-light irradiation), while Ca2+ at concentrations higher than 50mM (k=-1.3×109M-1s-1) induced aggregation of Ag/AgCl and thus all of them revealed inhibitory effects. In contrast, NO3- (k=6.9×108M-1s-1) and CO32- (k=3.7×108M-1s-1) improved the photocatalytic activity of Ag/AgCl slightly by improving the rate of HO• generation. Other ubiquitous secondary effluent components including SO42- (k=3.9×105M-1s-1), NH3+ (k=3.5×105M-1s-1) and Na+ (k=2.6×104M-1s-1) had negligible effects. 90% of 17-α-ethynylestradiol (EE2) spiked in the secondary effluent was removed within 12min, while the structure and size of Ag/AgCl @ chiral TiO2 nanofibers remained stable. This work may be helpful not only to uncover the photocatalytic mechanism of Ag/AgCl based photocatalyst but also to elucidate the transformation and transportation of Ag and AgCl in natural water.
Description: This paper was accepted for publication in the journal Journal of Hazardous Materials and the definitive published version is available at http://dx.doi.org/10.1016/j.jhazmat.2014.10.060
Sponsor: The study was financially supported by the National Natural Science Foundation of China (No. 51322901), and the Fundamental Research Funds for the Central Universities (No. 2014B02914) and the research fund provided by the National Basic Research Program of China (‘973’ program, No. 2010CB429006).
Version: Accepted for publication
DOI: 10.1016/j.jhazmat.2014.10.060
URI: https://dspace.lboro.ac.uk/2134/22963
Publisher Link: http://dx.doi.org/10.1016/j.jhazmat.2014.10.060
ISSN: 0304-3894
Appears in Collections:Published Articles (Chemical Engineering)

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