摘要
以金属有机骨架MOF-5为前驱体,在氮气气氛下高温处理得ZnO/C,通过水热法将ZnO/C负载到TiO2中获得ZnO/C/TiO2纳米复合光催化剂,对其晶体结构、形貌特征、成分等进行了表征,采用正交实验法考察了MOF-5处理温度、ZnO/C负载量、钛酸丁酯加入量对复合光催化剂催化降解甲基橙性能的影响.结果表明,TiO2的比表面积为87.5m^2/g,ZnO/C/TiO2的比表面积为109.0m^2/g.制备ZnO/C/TiO2的最佳条件为MOF-5处理温度600℃,ZnO/C负载量0.07 g,钛酸丁酯加入量1.5 mL.甲基橙用紫外灯照射90 min,以TiO2为催化剂时降解率为62.1%,以ZnO/C/TiO2为催化剂时降解率达99.5%,光催化活性大大提高.
The use of materials such as grapheme and metal organic framworks to enhance the electronic transmission capacity of semiconductor photocatalytic materials has become increasingly popular. In the experiment, ZnO/C was obtained from the metal organic framework MOF-5, which was used as precursor, by high-temperature treatment under nitrogen atmosphere. Then the nanocomposite photocatalyst ZnO/C/TiO2 composite was prepared by hydrothermal method using TiO2 as the basic particles. The crystal structure, morphology and composition properties of the samples were characterized by the approaches such as XRD, SEM, energy spectrum, surface area analyzer and porosity analyzer. By using orthogonal experiment method, the effects of MOF-5 treatment temperature was evaluated, and the influence of doping amount of ZnO/C and adding amount of butyl titanate on the photocatalytic properties of photocatalyst to methyl orange degradation were investigated by the orthogonal test as well. The results showed that the particle size of ZnO/C/TiO2 composite was 11.89 nm, the size of the sample was evenly distributed, and the particle size was nano-level, no agglomeration, the specific surface areas of TiO2 and ZnO/C/TiO2 were 87.5 and 109.0 m^2/g, the average pore radius of them were 2.72 and 2.61 nm. The best conditions for the preparation of ZnO/C/TiO2 were as follows： MOF-5 was treated under 600℃, ZnO/C doping amount of 0.07 g, and addtion 1.5 mL of butyl titanate. After 90 min irradiation under UV light, the degradation rate of methyl orange was 62.1% with TiO2 as photocatalyst, the degradation rate was improved greatly to 99.5% with ZnO/C/TiO2 as photocatalyst. The catalytic activity increased substantially.
作者
谢桂香
魏基坚
胡志彪
郑瑞娟
Guixiang XIE;Jijian WEI;Zhibiao HU;Ruijuan ZHENG(College of Chemistry and Material Science,Longyan University,Longyan,Fujian 364012,China;Fujian Provincial Key Laboratory of Clean Energy Materials,Longyan University,Longyan,Fujian 364012,China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2018年第5期1068-1074,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金项目(编号:21371088)
福建省大学生创新创业训练计划项目(编号:201611312025)
龙岩学院产学研项目(编号:LC20140007)
