纳米二氧化钛悬乳体系光催化降解愈创木酚机理的研究

Study on photocatalytic degradation of guaiacol in aqueous suspension of nanometer TiO_2

采用溶胶-凝胶法(Sol-gel)制备的纳米TiO2作为催化剂,以造纸废水中木质素的模型物愈创木酚(G-M)为对象,在一定的降解条件下对G-M光催化降解动力学和机理进行了研究。结果表明,G-M的光催化降解过程包含吸附和降解两个过程,通过对G-M在TiO2表面吸附性能的研究,得到其吸附平衡常数;运用L-H方程,对G-M光催化降解动力学方程进行讨论,得到降解动力学方程:1/r=1.774/C+0.1034。同时,对TiO2光催化降解机理进行了探讨。

The photocatalytic degradation kinetics and mechanism of Guaiacol （G-M） in the presence of nanometer TiO2 prepared by sol-gel method have been studied. The results indicate that the G-M photocatalytic degradation process includes adsorption and degradation. On the basic of capability of adsorption on the surface of TiO2 ,we gained the adsorption equilibrium constant,and applied L-H equation to detrude the photocatalytic degradation kinetics equation, which is 1/r = 1. 774/C ＋ 0. 103 4. Meanwhile,the photocatalytic degradation mechanism of TiO2 was discussed.