期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 174, 期 -, 页码 109-115出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2016.10.011
关键词
Dye-sensitization; Photocatalysis; Photo-reduction; Cd (II); TiO2; Visible-solar light; Eosin Y
资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
Cadmium is toxic to humans, animals, and plants, and show persistence because of its non-degradability. Photo-reduction of cadmium ion (Cd (II)) was studied with Eosin Y-sensitized TiO2 photocatalyst for the reduction/removal of Cd (II) in an aqueous medium under visible-solar light. Triethanolamine (TEOA) was used as a sacrificial electron donor. The band-gap of Eosin Y-sensitized TiO(2)photocatalyst was reduced by similar to 1 eV, and visible light activity was observed for Cd (II) photo-reduction. Parametric studies were performed for visible-solar light intensity, solution pH, and initial concentrations of metal ion, dye, photo catalyst, and an electron donor. Complete photo-reduction of Cd (II) was achieved in 3 h at a pH of 7.0 and a light intensity of 100 mW cm(-2). The photo-reduction rata of Cd (II) in TEOA solution followed Langmuir-Hinshelwood rate equation. The highest apparent quantum yield (similar to 0.3%) for Cd (II) photo-reduction was observed at the lower visible light intensity with illuminated Eosin Y-sensitized TiO2. (C) 2016 Elsevier B.V. All rights reserved.
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