钴负载MCM-41分子筛催化臭氧氧化水中氯代苯甲酸

Catalytic ozonation of chlorobenzoic acid over cobalt oxide supported on MCM-41 mesoporous molecular sieves

通过水热法合成介孔分子筛MCM-41,采用等体积浸渍法制备了Co负载MCM-41分子筛催化剂(Co/MCM-41).小角X-射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-vis DRS)、N2吸附-脱附等温线及透射电镜(TEM)等对催化剂的成分、结构的表征结果显示,Co/MCM-41保持了纯硅MCM-41有序的介孔结构,钴元素以钴氧化物形式存在,比表面达到772 m.2g-1.将Co/MCM-41分子筛用于催化臭氧氧化水中对氯苯甲酸(p-CBA)的研究,结果表明,在优化条件下(2%负载量和25℃反应温度),催化剂的加入显著改善了TOC去除率,达到84.6%,是单独臭氧氧化的1.6倍.

MCM-41 mesoporous molecular sieve was synthesized by a hydrothermal method and Co/MCM-41 was prepared by an incipient wetness impregnation method.The materials were characterized by a low angle X-ray powder diffraction（XRD）,UV-Vis diffuse reflection spectroscopy（UV-DRS）,N2 adsorption-desorption and transmission electron microscopy（TEM）.The results showed that the material retained a highly ordered mesopore structure of pure silica MCM-41 and had a surface area of 772 m2·g-1,Cobalt ions mainly exist as cobalt oxide clusters distributed on the surface of molecular sieve.In this study,Co/MCM-41 mesoporous molecular sieve was used for catalytic ozonation of p-CBA.The results showed that under the optimal condition（2% cobalt load and 25 ℃）,the mineralization of p-CBA increased to 84.6% in the presence of catalyst,which is 1.6 times that of ozone alone at the reaction time of 60 min.