摘要
光催化还原CO_(2)为有价值的化学品为缓解温室效应提供了理想的途径。本工作中,采用纳米球形SiO_(2)模板剂抑制光催化剂颗粒的生长从而合成高比表面积的多孔Bi_(0.5)La_(0.5)VO_(4)(BLV)固溶体光催化材料。得益于纳米SiO_(2)的限域效应,硬模板法制备的固溶体的粒径明显小于固相法制备的体相固溶体。N_(2)吸脱附测试结果显示950℃焙烧下制备的多孔BLV的比表面积为固相法的11.9倍。光催化CO_(2)还原活性评价表明多孔BLV-950固溶体的CO析出速率达0.58μmol·g^(-1)·h^(-1),是体相BLV的3.9倍。这归因于多孔BLV较体相具有更高的载流子分离效率和更低的CO_(2)还原界面阻力。
Photocatalytic CO_(2)reduction provides an ideal way to alleviate the greenhouse effect and obtain valuable chemicals.In this work,the porous Bi_(0.5)La_(0.5)VO_(4)(BLV)solid solution photocatalytic materials with the specific surface area were synthesized by inhibiting the growth of photocatalyst particles by nanospherical SiO_(2)template.Due to the confinement effect of nano-SiO_(2),the particle size of the solid solution prepared by the hard template method is significantly smaller than that of the solid solution prepared by the solid phase method.The results of the N_(2)adsorption-desorption test showed that the specific surface area of porous BLV prepared by calcination at 950℃was 11.9 times that of bulk BLV.The evaluation of photocatalytic CO_(2)reduction activity shows that the CO evolution rate of porous BLV-950 solid solution is0.58μmol·g^(-1)·h^(-1),which is 3.9 times that of bulk BLV.This is attributed to the fact that porous BLV has higher carrier separation efficiency and lower CO_(2)reduction interface resistance than bulk BLV.
作者
孙雨平
马洋博
刘小强
高丽
陈威
SUN Yuping;MA Yangbo;LIU Xiaoqiang;GAO Li;CHEN Wei(College of Chemistry and Molecular Sciences,Henan University,Kaifeng 475004,Henan,China)
出处
《化学研究》
CAS
2024年第1期16-22,共7页
Chemical Research
基金
National Natural Science Foundation of China(51602091)
Project of Department of Science and Technology,Henan Province(222102320344)。
