纳米TiO_2光催化氧化紫丁香醇降解机理研究

Study on the Photocatalytic Degradation Mechanism of Syringe Lignin with TiO_2

采用自制纳米TiO2作光催化剂,在一定降解条件下,对木质素模型的紫丁香醇(SL-M)光催化降解的动力学进行了研究。实验结果表明,SL-M的光催化降解过程包括吸附和降解两个过程,SL-M在TiO2光催化剂表面上的吸附常数Ka=2.754×10-2,最大吸附量Qmax=11.468 mg/g,运用L-H方程讨论了SL-M的降解动力学,并得到反应动力学方程1/r=3.675/c+0.1012。同时,探论了降解过程的各种单因素条件如溶液初始质量浓度、溶液pH值、曝气量对SL-M降解速率的影响。

The photo-catalytic degradation kinetic mechanism of syringe lignin（SL） （ OHC6 H3 （ OCH3 ） 2 ） was investigated using self-prepared TiO2 as an activated catalyst. The results showed that the SL photo-catalytic degradation consisting two processes of adsorption and degradation. The adsorption equilibrium constant on TiO2 surface Ka = 2. 754 ×10^-2, max adsorption amount Q -- 11. 468 mg/g. Reaction kinetic equation 1/r = 3. 675/c ＋0. 1012 was derived based on the discussion of degradation kinetic of SL with L-H equation. Some factors affected SL degradation rate, such as solution initial concentration, pH, and oxygen amount were discussed.