鳞片状分层结构Ni(OH)_(2)/CeO_(2)制备及光催化CO_(2)还原性能  

Preparation of Scaly-Like Hierarchical Structure Ni(OH)_(2)/CeO_(2) and Photocatalytic CO_(2) Reduction Performance

作　　者：李跃军[1] 曹铁平[1] 孙大伟 王雪纯 李剑飞 Li Yuejun;Cao Tieping;Sun Dawei;Wang Xuechun;Li Jianfei(Research Centre of Nano Photocatalyst Materials of Baicheng Normal University,Baicheng 137000,China)

机构地区：[1]白城师范学院纳米光催化材料研究中心,吉林白城137000

出　　处：《中国稀土学报》2024年第5期926-934,I0003,共10页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(21573003);国家级大学生创新创业项目(202110206008)资助。

摘　　要：CO_(2)的过量排放导致了严重的环境问题。光催化技术将CO_(2)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CeO_(2)纳米纤维表面,制得Ni(OH)_(2)/CeO_(2)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)/CeO_(2)异质结可以显著提高CeO_(2)纳米纤维的光催化活性。质量分数为10%的Ni(OH)_(2)/CeO_(2)表现出最佳光催化活性,在模拟太阳光照8 h后,产物CH_(4),CO和CH_(3)OH的总产量分别达到21.96,9.18和7.31μmol·g^(-1)。在5次循环实验中,光催化产物产量仅有小幅下降,其主要产物CH_(4),CO和CH_(3)OH的产量仍然维持在18.05,6.88和5.78μmol·g^(-1)。此项工作为定向合成CeO_(2)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。Excessive CO_(2) emissions have led to serious environmental problems.The photocatalytic reduction of CO_(2) to value-added chemicals is a promising strategy to reduce carbon emissions and alleviate the energy crisis simultaneously.Herein,a novel Ni(OH)_(2)/CeO_(2) composite fibres photocatalyst was constructed by embeding CeO_(2) 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,scanning electron microscopy,high resolution transmission electronmicroscopy,X-ray photoelectric spectroscopy,ultraviolet-visible absorption spectrum and carbon adsorption.The results show that Ni(OH)_(2)/CeO_(2) heterojunction can significantly improve the photocatalytic performance.10%Ni(OH)_(2)/CeO_(2) exhibits the best photocatalytic activity under simulation of the sunlight.The CH_(4),CO and CH_(3)OH yields of the optimal Ni(OH)_(2)/CeO_(2) catalyst reach 21.96,9.18 and 7.31μmol·g^(-1),respectively,after 8 h of simulation of the sunlight.The photocatalytic activity of 10%Ni(OH)_(2)/CeO_(2) slightly decreases at the eighth cycling,but its CH_(4),CO and CH_(3)OH yields still reach 18.05,6.88 and 5.78μmol·g^(-1),respectively.This work provides a simple and efficient method for the directional synthesis of CeO_(2) based composite photocatalytic materials and illustrates an applicable tactic to develop potent photocatalysts for clean energy conversion.

关 键 词：鳞片状 分层结构 Ni(OH)_(2)/CeO_(2) 光催化 CO_(2)还原 

分 类 号：O643[理学—物理化学]