Xue Limei

Preparation of Light-Driven Spinel Nanoparticles CoAl2O4, MgFe2O4 and CoFe2O4 and Their Photocatalytic Reduction of Carbon Dioxide

Visible-light response CoAl2O4, MgFe2O4 andCoFe2O4 spinel nanoparticles were prepared by the inorganic salt sol-gel method£¬ and characterized by using XRD, SEM and UV-Vis. The characterization show that the three photo catalysts were in spinel-type structure with the spherical-like particle size in the range of 3¡«20 nm. The absorbing wavelengths of the three photo catalysts were larger than 800 nm. Their calculated band gaps were less than 1.55 eV. CO2 was photo catalytically reduced to form HCOOH by CoAl2O4, MgFe2O4 and CoFe2O4 nanoparticles under their radiation of the simulated daylight lamp. The investigation shows that the three photo catalysts all have better activity. Methanoic acid yield may achieve4988.11 ¦Ìmol/g-Cat when irradiation time is five hours, and the activity of CoFe2O4 had best.