CdS nanoparticles deposited on montmorillonite: preparation, characterization and application for photoreduction of carbon dioxide

Petr Praus; Ondřej Kozák; Kamila Kočí; Aleš Panáček; Richard Dvorský

doi:10.1016/j.jcis.2011.05.004

CdS nanoparticles deposited on montmorillonite: preparation, characterization and application for photoreduction of carbon dioxide

J Colloid Interface Sci. 2011 Aug 15;360(2):574-9. doi: 10.1016/j.jcis.2011.05.004. Epub 2011 May 9.

Authors

Petr Praus¹, Ondřej Kozák, Kamila Kočí, Aleš Panáček, Richard Dvorský

Affiliation

¹ Department of Analytical Chemistry and Material Testing, VŠB-Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic. petr.praus@vsb.cz

PMID: 21616501
DOI: 10.1016/j.jcis.2011.05.004

Abstract

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 CTA. 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) ≫ CH(4) > CO. Amounts of these products were 4-8 folds higher then those obtained with TiO(2) Evonic P25. Hydrogen reduced CO(2) to CO and CH(4).