Fe3O4@Ag3PO4/AgCl光催化剂的制备及光降解性能研究

doi:10.19965/j.cnki.iwt.2020-1046

摘要/Abstract

摘要：

光催化作为一种绿色环境治理技术，成为学界的重要研究方向之一。然而，绝大部分光催化反应需要依靠紫外光激发，发展前景受到极大限制。采用两步沉淀法制备了磁性可见光催化剂Fe₃O₄@Ag₃PO₄/AgCl，通过X射线衍射（XRD）、透射电子显微镜（TEM）和紫外-可见吸收光谱（UV-Vis）对其进行结构和组成特性分析。与此同时，以亚甲基蓝（MB）为目标污染物，研究了Fe₃O₄@Ag₃PO₄/AgCl光催化剂的可见光催化降解性能。XRD和TEM分析表明，Fe₃O₄@Ag₃PO₄/AgCl光催化剂是由Ag₃PO₄包覆在磁性纳米Fe₃O₄粒子表面，并由AgCl表面修饰Fe₃O₄@Ag₃PO₄形成。UV-Vis分析表明，Fe₃O₄@Ag₃PO₄/AgCl是可见光催化剂，且Fe₃O₄的负载能提高Ag₃PO₄对可见光的利用率。Ag₃PO₄光催化剂的循环利用性能较差，而Fe₃O₄@Ag₃PO₄/AgCl的循环利用性能较好。此外，Fe₃O₄@Ag₃PO₄/AgCl光催化降解MB过程中，主要的活性物质是O₂^·-和h⁺，其中h⁺的影响更为显著。

关键词: Fe₃O₄@Ag₃PO₄/AgCl, 光催化, 亚甲基蓝, 可见光

Abstract:

As a green environmental treatment technology, photocatalysis has become one of the important research fields. However, most photocatalysis reactions depend on ultraviolet excitation, which limits the development of photocatalysis. Magnetic photocatalyst Fe₃O₄@Ag₃PO₄/AgCl was synthesized via two-step precipitation method. The structural and composition characteristics were analyzed using X-ray diffraction(XRD), transmission electron microscope(TEM) and ultraviolet-visible(UV-Vis) absorption spectroscopy. In the meantime, the photocatalytic activity of Fe₃O₄@Ag₃PO₄/AgCl was evaluated by monitoring its degradation performance for methylene blue(MB) under visiblelight irradiation. XRD and TEM results showed that Ag₃PO₄ was loaded on the surface of magnetic Fe₃O₄ nanoparticles, and AgCl modified the surface of Fe₃O₄@Ag₃PO₄. UV-Vis absorption spectroscopy indicated that Fe₃O₄@Ag₃PO₄/AgCl was a visible light-driven photocatalyst, and the loading of Fe₃O₄ could improve the utilization of visible light for Ag₃PO₄. The Ag₃PO₄ photocatalyst had poor recycling performance, while Fe₃O₄@Ag₃PO₄/AgCl was good. In addition, holes and O₂^·- were the main reactive species in the photocatalytic process for the MB degradation, and holes played the most obvious role.

Key words: Fe₃O₄@Ag₃PO₄/AgCl, photocatalysis, methylene blue, visible light

中图分类号:

X703
TQ032

张先盼,罗秋霞,严小琴,谢逸峰,罗琨. Fe₃O₄@Ag₃PO₄/AgCl光催化剂的制备及光降解性能研究[J]. 工业水处理, 2021, 41(8): 81-86.

Xianpan Zhang,Qiuxia Luo,Xiaoqin Yan,Yifeng Xie,Kun Luo. Study on preparation and photocatalytic degradation performance of Fe₃O₄@Ag₃PO₄/AgCl[J]. Industrial Water Treatment, 2021, 41(8): 81-86.

https://www.iwt.cn/CN/Y2021/V41/I8/81

图/表 6

图1 Fe₃O₄、Ag₃PO₄和Fe₃O₄@Ag₃PO₄/AgCl的XRD谱图

Fig.1 XRD patterns of Fe₃O₄, Ag₃PO₄ and Fe₃O₄@Ag₃PO₄/AgCl

图2 样品的TEM

Fig.2 TEM images of Fe₃O₄(a, b), Ag₃PO₄(c, d), Fe₃O₄@Ag₃PO₄/AgCl(e, f)
a, b-Fe₃O₄; c, d-Ag₃PO₄; e, f-Fe₃O₄@Ag₃PO₄/AgCl

图3 光催化剂的紫外-可见吸收光谱

Fig.3 UV-Vis spectra of Ag₃PO₄ and Fe₃O₄@Ag₃PO₄/AgCl

图4 MB初始质量浓度对光催化效果的影响

Fig.4 Effect of initial MB mass concentration on photocatalytic degradation efficiency(a-Ag₃PO₄; b-Fe₃O₄@Ag₃PO₄/AgCl)
a-Ag₃PO₄; b-Fe₃O₄@Ag₃PO₄/AgCl

图5 循环利用次数对光催化降解率的影响

Fig.5 Effect of recycling on photocatalytic degradation efficiency(a-Ag₃PO₄; b-Fe₃O₄@Ag₃PO₄/AgCl)
a-Ag₃PO₄; b-Fe₃O₄@Ag₃PO₄/AgCl

图6 Fe₃O₄@Ag₃PO₄/AgCl光降解过程活性物质捕获实验（a），可见光催化机制（b）

Fig.6 Photocatalytic degradation of under visible light in the presence of different scavengers(a), photocatalytic mechanism scheme under visible light(b)

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Fe₃O₄@Ag₃PO₄/AgCl光催化剂的制备及光降解性能研究

Study on preparation and photocatalytic degradation performance of Fe₃O₄@Ag₃PO₄/AgCl

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