掺镧TiO_2光催化降解罗丹明B的研究

Study on photocatalytic degradation of Rhodamine B in La-doped TiO_2

采用溶胶-凝胶法制备了掺镧TiO2微粒.以罗丹明B为目标降解物,分别在太阳光和紫外灯下照射,考察了掺镧TiO2光催化活性.结果表明:在紫外光下,pH值为6时,用4 g/L掺镧0.25%TiO2降解罗丹明B光催化活性最佳;在太阳光下,pH值为6时,用5 g/L掺镧0.075%TiO2降解罗丹明B光催化活性最佳;加入H2O2都能提高光催化效果,在太阳光下,由于TiO2和H2O2的协同作用,催化降解率能达到90%以上.

The La-doped TiO2 nanoparticles were prepared by the sol-gel method.Rhodamine B was used as target degradation product,the photocatalytic activity of La-doped TiO2 was studied under the sun light and ul-traviolet irradiation.The results showed that the photocatalytic activity of 4 g/L 0.25% La-doped nano-TiO2 was the highest at pH 6 under UV light,and that of 5 g/L 0.075% La-doped nano-TiO2 was the highest at pH 6 un-der sunlight.Whether in the sunlight or UV,H2O2 could improve the photocatalytic effect.The catalytic degrada-tion rate could reach more than 90% under sunlight because of the coordination role of TiO2 and H2O2.