摘要
以SiO_(2)气凝胶为载体,采用溶胶凝胶法制备出复合TiO_(2)-SiO_(2)光催化剂。通过扫描电子显微镜、傅里叶变换红外光谱、X射线衍射图谱和比表面积测定等分析手段对复合光催化剂进行表征。结果表明,TiO_(2)微粒均匀搭载在SiO_(2)气凝胶的表面,复合光催化剂具有丰富的空间孔结构和良好的比表面积。在单因素实验和响应面优化实验基础上得出制备复合光催化剂的最佳工艺条件为:正硅酸乙酯(TEOS)和水的用量比(V/V)为4∶1,悬浮液中TiO2的浓度为2.21 g/L,溶胶凝胶时间为3.11 d;最优工艺条件下制备的复合光催化剂对10 mg/L的亚甲基蓝溶液进行24 h降解处理,去除率达到99.1%。
Composite TiO_(2)-SiO_(2) photocatalysts were prepared by sol-gel method using SiO_(2) aerogel as carrier. The composite catalysts were characterized by scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray diffraction and specific surface area and pore structure analysis. The results show that TiO_(2) particles are uniformly distributed on the surface of SiO_(2) aerogels,and the catalysts have abundant spatial pore structure and good specific surface area. Based on the single factor experiments and the response surface optimization experiments,the optimum technological conditions for the preparation of composite catalysts sre obtained as follows:the ratio of tetraethyl orthosilicate(TEOS)to water(V/V)is 4:1,the concentration of TiO_(2) in suspension was 2.21 g/L,and the sol-gel time is 3.1 days. The composite catalyst prepared under the optimum conditions is used to degrade 10 mg/L methylene blue solution for 24 hours,and the removal rate reaches 99.1%.
作者
陈俊英
周航宇
白净
常春
Chen Junying;Zhou Hangyu;Bai Jing;Chang Chun(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Center for Outstanding Overseas Scientists,Zhengzhou 450001,China)
出处
《太阳能学报》
CSCD
北大核心
2021年第8期113-119,共7页
Acta Energiae Solaris Sinica
基金
河南省自然科学基金(162300410250)
河南省科技协会项目(HNKJZK-2019-20B)
河南省杰出外籍科学家工作室项目(GZS2018004)。
