鳞片状分层结构Ni(OH)2/CeO2制备及光催化CO2还原性能
Preparation of Scaly-Like Hierarchical Structure Ni(OH)2/CeO2 and Photocatalytic CO2 Reduction Performance
李跃军 1曹铁平 1孙大伟 1王雪纯 1李剑飞1
作者信息
- 1. 白城师范学院纳米光催化材料研究中心,吉林白城 137000
- 折叠
摘要
CO2的过量排放导致了严重的环境问题.光催化技术将CO2转化为高附加值化合物不仅可以减小碳排放,也可以缓解能源短缺.本研究采用静电纺丝技术结合水热法,将Ni(OH)2纳米片镶嵌在CeO2纳米纤维表面,制得Ni(OH)2/CeO2复合纤维光催化剂.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)和碳吸附等方法对其微观结构、形貌和光学性能进行表征.结果表明:Ni(OH)2/CeO2异质结可以显著提高CeO2纳米纤维的光催化活性.质量分数为10％的Ni(OH)2/CeO2表现出最佳光催化活性,在模拟太阳光照8 h后,产物CH4,CO和CH3OH的总产量分别达到21.96,9.18和7.31 µmol·g-1.在5次循环实验中,光催化产物产量仅有小幅卜降,其主要产物CH4,CO和CH3OH的产量仍然维持在18.05,6.88和5.78 pmol·g-1.此项工作为定向合成CeO2基复合纤维光催化材料提供了 一种简便有效的制备方法,为清洁能源转换探索了一条可行路径.
Abstract
Excessive CO2 emissions have led to serious environmental problems.The photocatalytic reduction of CO2 to value-added chemicals is a promising strategy to reduce carbon emissions and alleviate the energy crisis simultaneously.Herein,a novel Ni(OH)2/CeO2 composite fibres photocatalyst was constructed by embeding CeO2 nanofibers assembled from the Ni(OH)2 nanosheets via an electrospinning combined with hydrothermal method.The composition,morphology and photoelectric properties were characterized by X-ray diffraction,scan-ning electron microscopy,high resolution transmission electronmicroscopy,X-ray photoelectric spectroscopy,ul-traviolet-visible absorption spectrum and carbon adsorption.The results show that Ni(OH)2/CeO2 heterojunction can significantly improve the photocatalytic performance.10％Ni(OH)2/CeO2 exhibits the best photocatalytic ac-tivity under simulation of the sunlight.The CH4,CO and CH3OH yields of the optimal Ni(OH)2/CeO2 catalyst reach 21.96,9.18 and 7.31 μmol·g-1,respectively,after 8 h of simulation of the sunlight.The photocatalytic activity of 10％Ni(OH)2/CeO2 slightly decreases at the eighth cycling,but its CH4,CO and CH3OH yields still reach 18.05,6.88 and 5.78 μmol·g-1,respectively.This work provides a simple and efficient method for the di-rectional synthesis of CeO2 based composite photocatalytic materials and illustrates an applicable tactic to devel-op potent photocatalysts for clean energy conversion.
关键词
鳞片状/分层结构/Ni(OH)2/CeO2/光催化/CO2还原Key words
scaly-like/hierarchical structure/Ni(OH)2/CeO2/photocatalyst/CO2 reduction引用本文复制引用
基金项目
国家自然科学基金项目(21573003)
国家级大学生创新创业项目(202110206008)
出版年
2024
NETL
NSTL
万方数据