处理温度对锐钛型TiO2光催化活性的影响及利用可见光降解甲基紫

高温处理锐钛型TiO2可以使其转晶以改变晶型比例,因此加热温度和加热时间是影响TiO2光催化活性的主要因素.本研究中,以该方法得到了可利用可见光的TiO2催化剂,并进行了可见光降解甲基紫的研究.结果表明,在TiO2和可见光共同作用下,甲基紫的光降解效果明显优于单独使用锐钛型、金红石型和按照转晶的比率混合的锐钛型和金红石型TiO2.5.0小时的照射其降解率即可达到94.2%以上.而相同条件下,采用锐钛型、金红石型和按照转晶的比率混合的锐钛型和金红石型TiO2降解率分别只有55.82%、51.20%和40.47%.

Influence of Treated Temperature on Photocatalytic Ability of Anatase TiO2 and Degradation of Methyl Violet Dyestuff using Visible Light

Heat treatment can result in the transition crystal of anatase TiO_2 and change the proportion of anatase and rutile phase,so the treated temperature and time influence the photocatalytic abilities of TiO_2.In this work,the TiO_2 catalysts which could utilize visible light were obtained by heat-treated method and then the photocatalytic degradations of methyl violet were investigated.The results show that the photocatalytic activity of treated TiO_2 catalyst is obviously higher than that of anatase and rutile TiO_2 catalysts as well as mixed TiO_2 catalyst whose proportion on anatase and rutile is according to the transformation crystal TiO_2 catalyst.The degradation ratio of methyl violet in the presence of the treated TiO_2 catalyst surpasses 94.2% within 5.0h visible light irradiation.while the degradation ratios are only 55.82%,51.20% and 40.47% for anatase,rutile and mixed TiO_2 catalysts respectively under same experimental conditions.