Papers by Author: Si Ming Dong

Abstract: Fe (III)-amidoximated PAN fiber complex was prepared and used as a heterogeneous photo-Fenton catalyst for the oxidative degradation of Reactive Red 195 in water. The nature and concentration effect of inorganic salts on the dye degradation was investigated. Moreover, UV-Vis spectrum was also used to examine the decomposition process of the dye in the presence of the salt. The results indicated that the existence of the inorganic salts limited the photocatalytic degradation of the dye in water. Na₂SO₄ shows more strong inhibition effect on dye degradation than the other salts at the same conditions. UV-Vis spectrum demonstrated that the decomposition of the aromatic rings in the dye molecules was also reduced in the presence of the salt.

Abstract: A SiO₂ aqueous sol was prepared and mixed with the anatase TiO₂ sol synthesized at low temperature in different molar ratios for the coating of cotton fabrics using padding-drying process. And then the photocatalytic activity of the resulting SiO₂/TiO₂-loaded cotton fabrics was evaluated in the degradation of Rhodamine B in water. The effect of the SiO₂ content on the photocatalytic performance of the loaded fabrics was investigated with respect to dye decoloration percentage. UV-Vis spectrum was also used to examine the dye degradation process in the presence of the SiO₂/TiO₂-loaded cotton fabric. The results indicate that when the ratio of Si/Ti reaches 1:1-3, the finished fabrics have the best photocatalytic activity. Moreover, UV-Vis spectrum indicates that the addition of SiO₂ on the cotton fabric can enhance the decomposition of the dye molecular azo linkages and aromatic rings.