钴钛氧化物异质结的制备及其光催化性能  

Preparation and photocatalysis of mixed cobalt and titanium oxides with heterojunction structure

作　　者：王雨薇[1] 李芳[1] 于晓[2] 孔祥贵[1] 雷晓东[1] 

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029 [2]沧州职业技术学院,河北沧州061001

出　　处：《石油化工》2016年第4期387-392,共6页Petrochemical Technology

基　　金：国家自然科学基金联合基金项目(U140710100)

摘　　要：采用水热法制备了具有异质结结构的Co_3O_4/TiO_2纳米复合材料(简称钴钛氧化物异质结),通过改变钴钛摩尔比和焙烧温度,并利用XRD,SEM,HRTEM,XPS等方法对所制备试样的形貌与结构进行了表征,考察了试样的结构及形貌的变化。以亚甲基蓝为降解对象,考察了钴钛氧化物异质结的光催化性能。实验结果表明,不同钴钛摩尔比和不同焙烧温度下制备的钴钛氧化物异质结在可见光下均有一定的光催化降解亚甲基蓝的能力,但降解效率有所不同;当钴钛摩尔比为2∶3、焙烧温度为400℃时,钴钛氧化物异质结可见光催化降解亚甲基蓝的效率最高,通过紫外分光光度计测试可知,在光照4 h后,降解率可达65%。Mixed cobalt and titanium oxides with different mole ratio of cobalt to titanium were prepared by hydrothermal method at different calcination temperature,and were characterized by means of XRD,SEM,HRTEM and XPS. The HRTEM result indicated heterojunction structure of the products. The photocatalysis of the products in the photodegradation of methylene blue under visible light irradiation was investigated. Under the conditions of the molar ratio of cobalt to titanium of 2∶3 and calcination temperature of 400 ℃,the prepared sample had the highest degradation rate（65%） for methylene blue.

关 键 词：钴钛氧化物 异质结 水热法 可见光催化降解 

分 类 号：TQ426.8[化学工程]