电气石/TiO2复合体系光催化降解苯酚溶液的反应动力学

摘要

采用电气石微粒表面钛盐水解包覆纳米TiO2的方法,在不同条件下构建电极性矿物/TiO2体系,分别采用扫描电子显微镜、傅里叶红外吸收光谱、高效液相色谱仪等对催化体系进行了表征。以苯酚溶液为目标物,考察了动态条件下催化体系对苯酚的去除效果,结果表明复合光催化体系对苯酚具有良好的分解性能,当比例为0.2时,催化效果增长的趋势非常明显,当反应时间为120min时,降解率达到了96.29%,高出了纯相TiO2的70%降解率将近26个百分点;在苯酚浓度不断变化时的速率常数从-0.0012～-0.0503变化,证明在苯酚浓度变化的条件下对催化剂的催化效率有明显的影响。在加入的催化剂量不断变化时的催化速率常数从-0.0105～-0.0051,降解苯酚符合Langmuir-Hinshelwood动力学方程。%This article used the method of titanium salts on the surface of tourmaline particles hydrolyzing and coating TiO2 to construct mineral with polar electricity and TiO2 system in different conditions.The catalysis system was characterized by scanning electron microscopy and fourier infrared absorption spectra,transmission electron microscopy.This system was getting a titanium dioxide/tourmaline composite functional material which would be used to treat wastewaters containing phenol.The decomposition efficiency could be 96.29% at 120min when the rate of tourmaline to TiO2 was 0.2,which was 26% higher than that of pure phase TiO2.The result of rate constant of phenol concentration changing from-0.0012 to-0.0012 shows that the change of phenol concentration has apparent influence on the catalysis efficiency of catalyst,and the rate constant of phenol amount changing from-0.0105 to-0.0051 shows that phenol decomposition conforms to Langmuir-Hinshelwood kinetics equation.