The sulfur-doped titanium dioxide (S/TiO2) was prepared by calcinations. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity is 2.7 times of...The sulfur-doped titanium dioxide (S/TiO2) was prepared by calcinations. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity is 2.7 times of TiO2. The results of XRD show that the sulfur can restrain the crystallization transformation of TiO2 from anatase to rutile, although the calcinations temperature has attained 500 ℃, the crystallization still is anatase entirely. The responsive wavelength range of S/TiO2 was shifted; it has obvious absorption in the region from 320 to 550 nm. The S (S6+) substituted for some of the lattice titanium atoms in S/TiO2. At the same time the XRF also prove the formation of S6+ and the atomic content is 2.13%.展开更多
The gaseous photochemical reaction of n-pentane and sulfur dioxide was studied.A series of gaseous products such as alcohols, ketones, acids, esters and inorganic compound were identified by GC/MS and GC. According to...The gaseous photochemical reaction of n-pentane and sulfur dioxide was studied.A series of gaseous products such as alcohols, ketones, acids, esters and inorganic compound were identified by GC/MS and GC. According to the characters of the compounds and the free radical theory, the free radical mechanism of this gaseous photochemical reaction was suggested. The free radical mechanism was verified directly by means of the gaseous free radicals measured by spin trapping-ESR methods in which PBN was selected as the spintrap.展开更多
文摘The sulfur-doped titanium dioxide (S/TiO2) was prepared by calcinations. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity is 2.7 times of TiO2. The results of XRD show that the sulfur can restrain the crystallization transformation of TiO2 from anatase to rutile, although the calcinations temperature has attained 500 ℃, the crystallization still is anatase entirely. The responsive wavelength range of S/TiO2 was shifted; it has obvious absorption in the region from 320 to 550 nm. The S (S6+) substituted for some of the lattice titanium atoms in S/TiO2. At the same time the XRF also prove the formation of S6+ and the atomic content is 2.13%.
文摘The gaseous photochemical reaction of n-pentane and sulfur dioxide was studied.A series of gaseous products such as alcohols, ketones, acids, esters and inorganic compound were identified by GC/MS and GC. According to the characters of the compounds and the free radical theory, the free radical mechanism of this gaseous photochemical reaction was suggested. The free radical mechanism was verified directly by means of the gaseous free radicals measured by spin trapping-ESR methods in which PBN was selected as the spintrap.
