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
We investigated the photovoltaic properties of series of TiO 2 photocatalysts by means of SPS and found that the thresholds of TiO 2 particles blue shift with their particle sizes decreasing and crystal phases changin...We investigated the photovoltaic properties of series of TiO 2 photocatalysts by means of SPS and found that the thresholds of TiO 2 particles blue shift with their particle sizes decreasing and crystal phases changing from rutile TiO 2 to anatase TiO 2. Combining with the photodegradation activities of TiO 2 on C 7H 16 , it was concluded that the photocatalytic activities of TiO 2 increase with their thresholds increasing,which can be explained using energy band theory. We also investigated the relationship beween the photovoltaic properties and photocatalytic activities of B TiO 2 before and after photooxidation on C 7H 16 , SO 2 and C 7H 16 +SO 2, respectively and found adsorbates at the surface of TiO 2 affect their photocatalytic activities and conduction types of surface layer.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We investigated the photovoltaic properties of series of TiO 2 photocatalysts by means of SPS and found that the thresholds of TiO 2 particles blue shift with their particle sizes decreasing and crystal phases changing from rutile TiO 2 to anatase TiO 2. Combining with the photodegradation activities of TiO 2 on C 7H 16 , it was concluded that the photocatalytic activities of TiO 2 increase with their thresholds increasing,which can be explained using energy band theory. We also investigated the relationship beween the photovoltaic properties and photocatalytic activities of B TiO 2 before and after photooxidation on C 7H 16 , SO 2 and C 7H 16 +SO 2, respectively and found adsorbates at the surface of TiO 2 affect their photocatalytic activities and conduction types of surface layer.
