摘要
Effect of adsorption mode on photodegradation of H-acid in TiO2 suspension was studied using DFT calculation,UV-Vis spec-troscopy,FTIR,and ionic chromatography.At pH 2.5,H-acid was adsorbed on TiO2 surfaces by one dissociated sulfonic group.The adsorbed sulfonic group was attacked by surface ·OH,resulting in the production of SO42-and the cleavage of the naphtha-lene ring.At pH 5.0,H-acid was adsorbed on TiO2 surfaces by two sulfonic groups.The two adsorbed sulfonic groups were sim-ultaneously attacked by surface ·OH,leading to a faster initial production of SO42-and initial degradation rate of H-acid than those under pH 2.5.Microscopic adsorption structures may be more important than adsorption amount in controlling the photo-degradation pathways of organic pollutants.
Effect of adsorption mode on photodegradation of H-acid in TiO2 suspension was studied using DFT calculation, UV-Vis spectroscopy, FTIR, and ionic chromatography. At pH 2.5, H-acid was adsorbed on TiO2 surfaces by one dissociated snlfonic group. The adsorbed sulfonic group was attacked by surface .OH, resulting in the production of SO42- and the cleavage of the naphthalene ring. At pH 5.0, H-acid was adsorbed on TiO2 surfaces by two sulfonic groups. The two adsorbed sulfonic groups were simultaneously attacked by surface -OH, leading to a faster initial production of SO42- and initial degradation rate of H-acid than those under pH 2.5. Microscopic adsorption structures may be more important than adsorption amount in controlling the photo- degradation pathways of organic pollutants.
基金
the National Natural Science Foundation of China (20777090 and 20477050)
