高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (11): 20220472.doi: 10.7503/cjcu20220472

• 物理化学 • 上一篇    下一篇

表面水热碳层对磁性NiFe2O4八面体光催化活性的影响

郭彪1, 赵晨灿1, 刘芯辛1(), 于洲1, 周丽景1, 袁宏明2, 赵震1()   

  1. 1.沈阳师范大学化学化工学院, 沈阳 110034
    2.吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012
  • 收稿日期:2022-07-11 出版日期:2022-11-10 发布日期:2022-08-12
  • 通讯作者: 刘芯辛,赵震 E-mail:liuxinxin1114@163.com;zhenzhao@cup.edu.cn
  • 基金资助:
    辽宁省教育厅科学研究经费项目(LQN201909);辽宁省自然科学基金(2019-ZD-0481);吉林大学无机合成与制备化学国家重点实验室开放课题(2020-32)

Effects of Surface Hydrothermal Carbon Layer on the Photocatalytic Activity of Magnetic NiFe2O4 Octahedron

GUO Biao1, ZHAO Chencan1, LIU Xinxin1(), YU Zhou1, ZHOU Lijing1, YUAN Hongming2, ZHAO Zhen1()   

  1. 1.College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China
    2.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
  • Received:2022-07-11 Online:2022-11-10 Published:2022-08-12
  • Contact: LIU Xinxin,ZHAO Zhen E-mail:liuxinxin1114@163.com;zhenzhao@cup.edu.cn
  • Supported by:
    the Project of Education Office of Liaoning Province, China(LQN201909);the Natural Science Foundation of Liaoning Province, China(2019-ZD-0481);the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, China(2020-32)

摘要:

采用葡萄糖水热碳化法合成了一系列碳层包覆的NiFe2O4核壳八面体(NiFe2O4@C). 通过调控葡萄糖的含量可以有效控制NiFe2O4表面包覆的碳层厚度. 利用X射线衍射(XRD)、 拉曼光谱(Roman)、 X射线光电子能谱(XPS)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)和紫外-可见漫反射光谱(UV-Vis DRS)等对NiFe2O4@C的组成、 结构、 形貌和光学性能进行了表征. 考察了表面水热碳层对NiFe2O4光催化降解亚甲基蓝(MB)性能的影响. 结果表明, NiFe2O4的光催化活性很大程度上依赖于在其表面包覆的碳层厚度, 碳层厚度为5.5 nm的NiFe2O4@C-3展现了最佳的光催化活性. 荧光光谱(PL)、 瞬态光电流和电化学阻抗谱(EIS)表征结果证明, NiFe2O4@C的光催化性能的提升归因于在NiFe2O4核和碳壳之间形成了异质结, 有效地促进了光生载流子的传输和分离效率. NiFe2O4@C复合材料展现了较好的稳定性和可回收性, 在污水处理方面有很大的应用潜力.

关键词: 磁性, 铁酸镍, 碳包覆, 核壳结构, 光催化

Abstract:

A series of magnetic carbon-coated NiFe2O4 core-shell octahedron(NiFe2O4@C) was synthesized by hydrothermal carbonization of glucose. The thickness of carbon layer on the NiFe2O4 surface could be precisely tuned by controlling the content of glucose. The composition, structure, morphology and optical properties of NiFe2O4@C composites were characterized by X-ray diffraction(XRD), Raman spectroscopy(Roman), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS). The photocatalytic performance for the MB-degradation of various NiFe2O4@C were explored. It is found that the photocatalytic activity strongly depended on the thickness of carbon layer on the surface of NiFe2O4. The NiFe2O4@C-3 with 5.5 nm carbon layer is endowed with the best photocatalytic performance for the MB photodegradation. Fluorescence spectroscopy(PL), transient photocurrent and electrochemical impedance spectroscopy(EIS) results show that the improvement of photocatalytic performance can be attributed to the formation of the heterojunction between the NiFe2O4 core and carbon shell, which effectively promotes the transmission and separation of photo-generated carriers. In addition, NiFe2O4@C possesses relatively high stability and retrievability, indicating that NiFe2O4@C has great potential for applications in sewage treatment.

Key words: Magnetism, NiFe2O4, Carbon coating, Core-shell structure, Photocatalysis

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