不同pH下KBiFe2O5可见光催化性能研究

doi:10.15541/jim20170610

无机材料学报 ›› 2018, Vol. 33 ›› Issue (7): 805-810.DOI: 10.15541/jim20170610 CSTR: 32189.14.10.15541/jim20170610

所属专题：光催化材料与技术

• • 上一篇

不同pH下KBiFe₂O₅可见光催化性能研究

李健¹, 张刚华², 范立坤², 黄国全¹, 高志鹏³, 曾涛^1,2

1. 上海电力学院环境与化学工程学院, 上海 200090;
2. 上海材料研究所上海市工程材料应用与评价重点实验室, 上海 200437;
3. 中国工程物理研究院流体物理研究所, 冲击波和爆轰物理国家重点实验室, 绵阳 621900

收稿日期:2017-12-28 出版日期:2018-07-10 网络出版日期:2018-06-19
作者简介:李健. E-mail: 18521099679@163.com

Enhanced Visible-light-driven Photocatalytic Activity of Multiferroic KBiFe₂O₅ by Adjusting pH Value

LI Jian¹, ZHANG Gang-Hua², FAN Li-Kun², HUANG Guo-Quan¹, GAO Zhi-Peng³, ZENG Tao^1,2

1. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
2. Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai Research Institute of Materials, Shanghai 200437, China;
3. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China

Received:2017-12-28 Published:2018-07-10 Online:2018-06-19
About author:LI Jian(1990-), male, candidate of Master degree. E-mail: 18521099679@163.com
Supported by:
Foundation item: National Natural Science Foundation China (51772184, 11704353);LSD Engineering Project (2016Z-04);Dean Fund of CAEP (YZJJLX2016001);CSS Project (YK2015-0602006);Shanghai Materials Genome Institute No.5 (16DZ2260605)

摘要/Abstract

摘要：

采用温和的水热法制备了多铁KBiFe₂O₅粉体。利用X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)等手段对样品的纯度及形貌进行了表征。利用紫外-可见漫反射(UV-Vis DRS)测试了样品的光吸收性能。通过降解罗丹明B(RhB)和甲基橙(MO)研究了染料溶液pH值对KBiFe₂O₅可见光催化性能的影响。结果显示, KBiFe₂O₅的可见光催化性能随着溶液pH值的下降而显著提升, 这是由于溶液中的催化剂在酸性条件下具有更好的分散性, 并且染料分子更容易吸附到催化剂表面, 从而提高催化效率。

关键词: KBiFe₂O₅, 光催化剂, 可见光照射, pH

Abstract:

Multiferroic KBiFe₂O₅ was successfully prepared by a facile hydrothermal method. Its phase purity and morphology were investigated by powder X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The visible-light absorption was confirmed by UV-Vis diffuse reaction spectroscopy (UV-Vis DRS). Effect of pH value on visible-light-driven photocatalytic properties of KBiFe₂O₅ was evaluated by degrading rhodamine B (RhB) and methyl orange (MO). It can be found that lower pH value contributed to smaller average particle size. The D₅₀of the sample at pH 7 is about 10 times larger than that at pH 2. Acid condition is beneficial to the dispersion of KBiFe₂O₅ nanoparticles, which leads to an enhanced photocatalytic performance. Photocatalytic activity of KBiFe₂O₅ is significantly improved by decreasing pH value of the solution, which is attributed to the promoted dispersion of catalyst particles in the suspension and the enhanced adsorption of dye molecules on the catalyst surface.

Key words: KBiFe₂O₅, photocatalyst, visible-light irradiation, pH value

中图分类号:

X703

李健, 张刚华, 范立坤, 黄国全, 高志鹏, 曾涛. 不同pH下KBiFe₂O₅可见光催化性能研究[J]. 无机材料学报, 2018, 33(7): 805-810.

LI Jian, ZHANG Gang-Hua, FAN Li-Kun, HUANG Guo-Quan, GAO Zhi-Peng, ZENG Tao. Enhanced Visible-light-driven Photocatalytic Activity of Multiferroic KBiFe₂O₅ by Adjusting pH Value[J]. Journal of Inorganic Materials, 2018, 33(7): 805-810.

图/表 5

Fig. 1 XRD patterns of as-grown KBiFe2O5 and after degradation at pH 2

Fig. 2 FE-SEM image (a, b), diffuse reflection spectrum (c), and (F(R)hv)2 against hv (d) of KBiFe2O5

Fig. 3 Degradation rates of RhB (a) and MO (b) using KBiFe2O5 at different pH values, and absorption changes of RhB (c) and MO (d) solution in photocatalytic process at pH 2

Fig. 4 Corresponding reaction rate constant k for the photocatalytic degradation of RhB (a) and MO (b) by KBiFe2O5 at various pH value, and circulating runs in the photocatalytic degradation of RhB (c) and MO (d) at pH 2

Table 1 Average particle size of KBiFe2O5 in suspensions at various pH values

Sample	pH=2	pH=3.5	pH=5	pH=7
D₅₀/μm	0.341	0.654	1.576	2.796

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不同pH下KBiFe₂O₅可见光催化性能研究

Enhanced Visible-light-driven Photocatalytic Activity of Multiferroic KBiFe₂O₅ by Adjusting pH Value

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