Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 360, Issue 2, Pages 574-579Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.05.004
Keywords
CdS nanoparticles; Montmorillonite; Photoreduction; Carbon dioxide
Categories
Funding
- Czech Science Foundation [P107/11/1918]
- Regional Materials Science and Technology Centre [CZ.1.05/2.1.00/01.0040]
- Ministry of Education, Youth and Sport of the Czech Republic [MSM 6198910016]
- EU [CZ.1.05/2.1.00/03.0069]
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CdS nanoparticles were precipitated by the reaction of cadmium acetate with sodium sulphide in the presence of cetyltrimethylammonium (CTA) and deposited on montmorillonite (MMT). The resulting CdS-MMT nanocomposite contained 6 wt.% of CdS and 30 wt.% of CIA. Band-gap energy of CdS was estimated at 2.63 +/- 0.09 eV using the Tauc plot. The size of CdS nanoparticles was calculated from the band-gap energy at 5 nm and from the micrographs of transmission electron microscopy (TEM) at 5 nm. Selected area electron diffraction (SAED) recognized the cubic structure of CdS (Hawleite). The dynamic light scattering (DLS) method confirmed that CdS nanoparticles were anchored on the surface of MMT particles. CTA was found to be intercalated into MMT and adsorbed on its external surface. CdS-MMT was used for the photoreduction of carbon dioxide dissolved in NaOH solutions. The yields of originating gas products can be arranged in the order: H-2 >> CH4 > CO. Amounts of these products were 48 folds higher then those obtained with TiO2 Evonic P25. Hydrogen reduced CO2 to CO and CH4. (C) 2011 Elsevier Inc. All rights reserved.
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