超声-浸渍法制备Fe^(3+)/TiO_2催化剂及其光催化性能研究

Preparation of Fe^(3+)/TiO_2 with ultrasonic-impregnation method and investigation of photocatalytic performance

采用超声-浸渍法制备Fe^(3+)/TiO_2光催化剂.首先研究了Fe^(3+)浸渍液浓度、煅烧温度和煅烧时间对Fe^(3+)/TiO_2光催化性能的影响,然后对Fe^(3+)/TiO_2光催化剂进行了结构表征和降解活性艳蓝光催化性能测试.实验结果表明,当Fe^(3+)浸渍液浓度为0.75g/L,煅烧温度为450℃,煅烧时间为2.5h时,Fe^(3+)/TiO_2光催化活性最高为98.12%(反应时间为2.5h).XRD谱图证实Fe^(3+)负载在TiO_2表面,激光粒度分析结果表明负载前后,催化剂粒径没有发生显著改变.光催化性能实验证实,Fe^(3+)/TiO_2降解活性艳蓝的光催化效率较TiO_2提高了20%;降解反应满足伪一级反应动力学,反应速率常数为0.0165min^(-1),半衰期为42.01min.

Fe3＋/TiO2 catalyst is prepared by the ultrasound-impregnation method and its photocatalytic performance is studied in this paper.Firstly,the effects of preparation conditions including Fe3＋concentration,calcination temperature and time on photocatalytic degradation for active brilliant blue are investigated,and then the structure and photocatalytic performance are analyzed.Experimental results display that the photocatalytic efficiency for active brilliant blue is 98.12%in 2.5hwhen optimal Fe3＋concentration,calcination temperature and time is 0.75g/L,450℃and 2.5h,respectively.XRD pattern proves that Fe3＋is doped on the surface of TiO2 and the data of laser particle size analysis suggestes that the particle size of catalyst does not grow apparently during the preparation procedure.Photocatalytic degradation efficiency of Fe3＋/TiO2 is higher than that of TiO2.Photocatalytic degradation confirms to pseudo first-order kinetics,and rate constant and half-life are 0.0165min-1 and42.01 min,respectively.