摘要
采用一步水热法制备CuO/CuAl_2O_4复合空心球光催化剂,用贵金属(Pt、Ag、Ru)对其进行负载修饰。采用XRD、SEM、TEM、HRTEM和Uv-vis DRS等方法对所得样品的晶体结构、形貌、组成及光吸收性能进行了表征。在模拟太阳光照射下,以光催化还原二氧化碳生成甲醇的量评价其活性,考察了贵金属种类及其负载量对CuO/CuAl_2O_4光催化还原活性的影响。结果表明,负载Pt和Ag后均提高了CuO/CuAl_2O_4光催化还原活性,而负载Ru后其光催化还原活性有所降低。负载1%Pt所得样品4 h光催化还原活性最佳,还原产物甲醇的峰面积为3 127.9,相比原样提高了约2.9倍。对Pt/CuO/CuAl_2O_4的光催化机理进行了初步探讨。
Hollow spherical CuO/CuAl_2O_4 composite catalysts were prepared by one-step hydrothermal method,with precious metals(Pt,Ag,Ru) nanoparticles loaded on its surface for modification. Characterization of crystalline structure,morphology,compositions and light absorption property was performed for the obtained sample with XRD,SEM,TEM,HRTEM and Uv-vis DRS. The photocatalytic activity was evaluated based on the amount of methanol generated by using photocatalytic reduction of CO2 with irradiation of the simulated sunlight,and effects of species and loading amount of precious metals on the photocatalytic reduction efficiency were investigated. Results indicated that the photocatalytic activity of CuO/CuAl_2O_4 had been enhanced after being loaded with Pt and Ag,but decreased after loading with Ru. It is found that sample being loaded with 1% Pt after 4-h photocatalytic reduction showed the best photocatalytic reduction activity,with the chromatographic peak area of the main reduction product,methanol reaching3 127. 9,increased by 2. 9 times compared with the original sample. And the mechanism of photocatalytic reduction of CO2 over the CuO/CuAl_2O_4 was preliminarily discussed.
出处
《矿冶工程》
CAS
CSCD
北大核心
2018年第1期115-118,122,共5页
Mining and Metallurgical Engineering
基金
湖南省教育厅重点项目(15A076)
湖南省自然科学基金面上项目(2017JJ2108)
湖南省大学生研究性学习和创新性实验计划项目(2017511)
