静电纺丝法制备氧化铈纳米纤维及光催化性能  

Synthesis and Photocatalytic Properties of Cerium Oxide Nanofibers by Electrospinning

作　　者：李百裕[1] 周杰[1] 陈玲霞[1] 朱蓓蓓[1] 王璐[1] 黄艳芳[1] 李亚 LI Bai-yu;ZHOU Jie;CHEN Ling-xia;ZHU Bei-bei;WANG Lu;HUANG Yan-fang;LI Ya(College of Pharmaceutical and Environmental Engineering,Nantong Vocational University,Nantong 226007,China;College of Environment and Bioengineering,Nantong College of Science and Technology,Nantong 226007,China)

机构地区：[1]南通职业大学药品与环境工程学院,江苏南通226007 [2]南通科技职业学院环境与生物工程学院,江苏南通226007

出　　处：《化学试剂》2023年第8期104-110,共7页Chemical Reagents

基　　金：江苏省“333”高层次人才培养工程;南通市科技局科技计划项目(MS2202033,JC2021008);江苏省社会科学基金项目(19GLD016)。

摘　　要：采用静电纺丝法合成了CeO_(2)纳米纤维,利用X-射线衍射光谱(XRD)、扫描电镜(SEM)、透射电镜(TEM)、红外光谱(FT-IR)、X-射线光电子能谱(XPS)和紫外-可见漫反射(UV-Vis DRS)对氧化铈纳米纤维进行表征。通过光催化还原Cr(Ⅵ)评估CeO_(2)纳米纤维的光催化活性。结果表明,制备的CeO_(2)纳米纤维纯度较高、分散均匀,具有较大的长径比;纳米材料中Ce元素主要以+4和+3价态存在,部分Ce^(3+)的存在促进了氧缺陷的形成;CeO_(2)纳米纤维的形成有效调节了CeO_(2)的禁带宽度,增强了其可见光吸收性能;在酸性条件下,可在60 min内实现Cr(Ⅵ)的完全还原,其反应速率常数是P25的8.2倍,同时CeO_(2)纳米纤维具有良好的稳定性,电子是该还原反应的主要活性物种。CeO_(2)nanofibers were synthesized by electrospinning,and characterized by X-ray diffraction spectroscopy(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and ultraviolet visible diffuse reflectance(UV-Vis DRS).The photocatalytic activity of CeO_(2)nanofibers was evaluated by photocatalytic reduction of Cr(Ⅵ).The results suggested that the prepared CeO_(2)nanofibers had high purity,uniform dispersion,and a large aspect ratio.In nanomaterials,Ce mainly exists in the+4 and+3 valence states,and the presence of some Ce^(3+)promotes the formation of oxygen defects.The formation of CeO_(2)nanofibers effectively adjusts the band gap width of CeO_(2)and enhances its visible light absorption performance.Under acidic conditions,the complete reduction of Cr(Ⅵ)could be achieved within 60 min,with a reaction rate constant of 8.2 times that of P25.Meanwhile,CeO_(2)nanofibers had good stability,and electrons were the main active species in this reduction reaction.

关 键 词：静电纺丝法 CeO 2 Cr(Ⅵ)还原 光催化 

分 类 号：O643.36[理学—物理化学]