Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 2, Pages 3769-3777Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.09.043
Keywords
Photocatalytic decolorization; Methyl orange; CdS; Carbon nanotubes; H2O2
Categories
Funding
- Natural Science Foundation of China [51208331, 21007044]
- Domestic Visitor Foundation for University Key Teacher by the Ministry of Education of China
- Municipal Planning Project for Science and Technology Development by Taizhou Government [121KY05]
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Cadmium sulfide/multi-walled carbon nanotubes/polymer nanocomposite (CdS/MWCNTs/polymer) was fabricated via a facile precipitation process by depositing nanocrystalline CdS on carbon nanotubes/crosslinked chitosan nanocomposite and characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). Under simulated solar light irradiation, a combination of CdS/MWCNTs/polymer and H2O2 was found to be highly efficient for photocatalytic decolorization of a soluble azo dye, methyl orange (MO), even at neutral pH values. 99.9% of MO solution was successfully decolorized after 90 mm under simulated solar light irradiation with 15 mg L-1 of initial MO concentration, 1.0 mM of H2O2 concentration and 0.70 g L-1 of photocatalyst dosage. Experimental results also indicated that the photocatalytic decolorization of methyl orange solution was strongly influenced by operational parameters and followed a simplified Langmuir-Hinshelwood (L-H) kinetic model with high R-2 values. When the CdS/MWCNTs/polymer-H2O2 system was reused for the 5th time, the decolorization efficiency was still about 88.0% after 90 mm under simulated solar light irradiation. As a result, the CdS/MWCNTs/polymer-H2O2 will potentially provide cheaper and cleaner means for the effective treatment of dyeing effluents since it increased substantially the efficiency of dye decolorization and could take full advantage of economical solar light. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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