COBALT OXIDE NANOPARTICLES ASSEMBLED WITH LAYERED DOUBLE HYDROXIDES, WITH APPLICATIONS IN CARBON DIOXIDE CAPTURE FROM WET GASES AND PHOTOCATALYTIC REDUCTION THEREOF

摘要

The invention relates to a process for preparing a nanocomposite for carbon dioxide adsorption from wet gases and photo-catalytic reduction thereof. According to the invention, the process consists in making a nano-architecture defined by CoOnanoparticles with average diameters of 7 nm, dispersed and stabilized on porous matrix nanoparticles, such as layered double hydroxides (LDHs) with an average diameter of 140 nm. The synthesis of the Co/LDHs nano-architecture is achieved due to the effect of structural memory of the LDHs matrix manifested in diluted cobalt salt solutions, such as cobalt sulphate, at the ambient temperature, to result in the CoO/LDHs nano-architecture with an adsorption capacity of 120 mg COper 1 g of nanocomposite and a photocatalytic efficiency of reducing the adsorbed COof 47%.