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

Abstract

CdS nanoparticlesnext term were precipitated by the reaction of cadmium acetate with sodium sulphide in the presence of cetyltrimethylammonium (CTA) and previous termdeposited on montmorillonitenext term (MMT). The resulting previous termCdSnext term-MMT nanocomposite contained 6 wt.% of previous termCdSnext term and 30 wt.% of CTA. Band-gap energy of previous termCdSnext term was estimated at 2.63 ± 0.09 eV using the Tauc plot. The size of previous termCdS nanoparticlesnext term 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 previous termCdSnext term (Hawleite). The dynamic light scattering (DLS) method confirmed that previous termCdS nanoparticlesnext term were anchored on the surface of MMT particles. CTA was found to be intercalated into MMT and adsorbed on its external surface.

previous termCdSnext term-MMT was used for the previous termphotoreduction of carbon dioxidenext term dissolved in NaOH solutions. The yields of originating gas products can be arranged in the order: H2 much greater-than CH4 > CO. Amounts of these products were 4–8 folds higher then those obtained with TiO2 Evonic P25. Hydrogen reduced CO2 to CO and CH4.