A series of studies were carried out to investigate the effect of crystal forms of TiO 2 on the activities in the photocatalyzing degradation of aqueous methyl orange. It is shown that the rutile could hardly catalyze...A series of studies were carried out to investigate the effect of crystal forms of TiO 2 on the activities in the photocatalyzing degradation of aqueous methyl orange. It is shown that the rutile could hardly catalyze the degradation of the methyl orange and anatase is more effective for catalyzing the degradation than rutile. Moreover, the activities of mixed crystalline forms of TiO 2 vary with the change of the values of A/R , the best of which is 9∶1. Some characterizations with XRD, XPS and SPS were performed and explanations to the phenomena that exist in photodegradation are given out.展开更多
The TiO 2 powder was prepared by a stearic acid gel method. XRD characterization indicated that the crystal form was anatase. The grain size, given out by Sherrer formula, is 19 nm. With polystyrene dissolved in tolue...The TiO 2 powder was prepared by a stearic acid gel method. XRD characterization indicated that the crystal form was anatase. The grain size, given out by Sherrer formula, is 19 nm. With polystyrene dissolved in toluene as binder, TiO 2 adhered to the glassfibre substrate. By this method, the powder was immobilized and the crystal form, grain size and photocatalysis activities were well maintained. Photocatalysis degradation properties were investigated by putting the TiO 2 immobilization film in the methyl orange aqueous system. The results indicated that the differences of degradation rate between the TiO 2 immobilization film and powder were not obvious, which made waste water treatment using photocatalysis degradation technique possible in the practical application. [WT5HZ]展开更多
文摘A series of studies were carried out to investigate the effect of crystal forms of TiO 2 on the activities in the photocatalyzing degradation of aqueous methyl orange. It is shown that the rutile could hardly catalyze the degradation of the methyl orange and anatase is more effective for catalyzing the degradation than rutile. Moreover, the activities of mixed crystalline forms of TiO 2 vary with the change of the values of A/R , the best of which is 9∶1. Some characterizations with XRD, XPS and SPS were performed and explanations to the phenomena that exist in photodegradation are given out.
文摘The TiO 2 powder was prepared by a stearic acid gel method. XRD characterization indicated that the crystal form was anatase. The grain size, given out by Sherrer formula, is 19 nm. With polystyrene dissolved in toluene as binder, TiO 2 adhered to the glassfibre substrate. By this method, the powder was immobilized and the crystal form, grain size and photocatalysis activities were well maintained. Photocatalysis degradation properties were investigated by putting the TiO 2 immobilization film in the methyl orange aqueous system. The results indicated that the differences of degradation rate between the TiO 2 immobilization film and powder were not obvious, which made waste water treatment using photocatalysis degradation technique possible in the practical application. [WT5HZ]
