化工学报 ›› 2019, Vol. 70 ›› Issue (3): 1198-1207.DOI: 10.11949/j.issn.0438-1157.20181233

• 材料化学工程与纳米技术 • 上一篇    下一篇

反溶剂沉淀法合成Fe3+掺杂ZnO纳米结构及其可见光催化性能

段云彪1(),徐存英2,3(),王祥2,刘海2,黄梦婷2   

  1. 1. 昆明理工大学材料科学与工程学院,云南 昆明 650093
    2. 昆明理工大学冶金与能源工程学院,云南 昆明 650093
    3. 复杂有色金属资源清洁利用国家重点实验室,云南 昆明 650093
  • 收稿日期:2018-10-19 修回日期:2018-12-05 出版日期:2019-03-05 发布日期:2019-03-05
  • 通讯作者: 徐存英
  • 作者简介:<named-content content-type="corresp-name">段云彪</named-content>(1963—),男,高级实验师,<email>1037550651@qq.com</email>|徐存英(1971—),女,博士,教授,<email>xucunying@foxmail.com</email>
  • 基金资助:
    国家自然科学基金项目(51764027)

Synthesis of Fe3+-doped ZnO nanostructures by antisolvent precipitation method and their visible photocatalytic activity

Yunbiao DUAN1(),Cunying XU2,3(),Xiang WANG2,Hai LIU2,Mengting HUANG2   

  1. 1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    3. State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization, Kunming 650093, Yunnan, China
  • Received:2018-10-19 Revised:2018-12-05 Online:2019-03-05 Published:2019-03-05
  • Contact: Cunying XU

摘要:

以氯化胆碱-草酸低共熔溶剂(ChCl-OA DES)为溶剂,ZnO和Fe2O3为原料,通过简单的反溶剂沉淀法制备出不同掺杂浓度的Fe3+掺杂ZnO(Fe-ZnO)纳米结构。采用SEM、XRD、拉曼光谱、XPS等手段对所制Fe-ZnO结构与形貌进行了表征。结果表明,Fe-ZnO是由直径为20~30 nm纳米晶组装而成的微米棒。不同掺杂浓度的Fe-ZnO纳米晶均为六方铅锌矿结构,Fe3+很好地进入ZnO晶格。同时考察了所制Fe-ZnO的光吸收特性和光催化活性,发现Fe3+掺杂使其吸收峰红移至可见光范围,有效增强了可见光区域的催化活性。当Fe掺杂量为1.0%(atom)时,样品的光催化活性最好,比ZnO增大了约102倍。这说明Fe3+掺杂可改善ZnO对可见光光子的捕获能力。

关键词: 低共熔溶剂, 反溶剂沉淀法, 制备, 铁掺杂氧化锌, 纳米结构, 催化

Abstract:

Fe3+-doped ZnO (Fe-ZnO) nanostructures with different dopant concentrations were successfully synthesized by a simple antisolvent precipitation method from the choline chloride-oxalic acid deep eutectic solvent (ChCl-OA DES). The structure and morphology of the prepared Fe-ZnO were characterized by SEM, XRD, Raman spectroscopy and XPS. The as-prepared Fe3+-doped ZnO sample was micro-rods that were composed of nanoparticles with diameter of 20—30 nm. All of Fe3+-doped ZnO samples with various Fe3+-doping concentration were hexagonal wurtzite structure and the Fe3+ ions were well incorporated into the ZnO crystal lattice. In addition, the optical properties and photocatalytic activities of the samples were investigated based on ultraviolet-visible (UV-Vis) spectra analysis as well as the degradation of Rhodamine B in aqueous solution under visible light. Compared with ZnO catalysts, the threshold wavelength of Fe3+-doped ZnO nanostructure was shifted to the full visible light region (red shift) and their absorption in the visible region increased with increasing of Fe3+-doping concentration from 0 to 5.0%(atom). The content of iron ion was found to be significant to the photocatalytic efficiency of Fe-ZnO nanostructures. The results demonstrated that the most optimal Fe3+-doping concentration was 1.0% (atom), and its photocatalytic activity was increased by 102% compared with ZnO under visible light. The enhanced photoactivity of the Fe3+-doped ZnO nanostructure was mainly due to the improved visible photon harvesting achieved by Fe3+ doping.

Key words: deep eutectic solvent, antisolvent precipitation method, preparation, Fe-doped ZnO, nanostructure, catalysis

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