稀土掺杂硼酸盐Bi2ZnB2O7: xDy3+光催化剂的合成及其催化机理

doi:10.16085/j.issn.1000-6613.2022-0079

化工进展 ›› 2022, Vol. 41 ›› Issue (11): 5843-5849.DOI: 10.16085/j.issn.1000-6613.2022-0079

稀土掺杂硼酸盐Bi₂ZnB₂O₇: xDy³⁺光催化剂的合成及其催化机理

赵文武(), 周海静, 黄雁, 王秀文, 郝斌, 刘剑()

唐山学院新材料与化学工程学院，河北唐山 063000

收稿日期:2022-01-11 修回日期:2022-03-22 出版日期:2022-11-25 发布日期:2022-11-28
通讯作者: 刘剑
作者简介:赵文武（1984—），女，博士，副教授，研究方向为光催化与发光材料。E-mail：zww995@163.com。
基金资助:
河北省高等学校科学技术研究项目(QN2020521);唐山市科技计划(21130235C)

Photocatalytic mechanism and synthesis of rare earth doped borate Bi₂ZnB₂O₇: xDy³⁺ photocatalyst

ZHAO Wenwu(), ZHOU Haijing, HUANG Yan, WANG Xiuwen, HAO Bin, LIU Jian()

School of New Materials and Chemical Engineering, Tangshan University, Tangshan 063000, Hebei, China

Received:2022-01-11 Revised:2022-03-22 Online:2022-11-25 Published:2022-11-28
Contact: LIU Jian

摘要/Abstract

摘要：

采用高温固相反应法制备了一系列镝离子掺杂Bi₂ZnB₂O₇（BZBO）光催化剂。通过XRD、TEM和HRTEM等手段对BZBO: xDy³⁺材料的结构及形貌等进行了表征，通过RhB溶液在紫外灯下的光降解实验研究了不同浓度镝离子掺杂对BZBO光催化性能的影响。RhB光降解实验结果表明，当Dy³⁺在BZBO中的掺杂量为4%时，BZBO: 4%Dy³⁺具有最好的光降解活性，其光降解活性为纯BZBO的1.56倍。通过光吸收性能分析可知，Dy³⁺的引入增强了BZBO的紫外吸收强度，并稍降低了其禁带宽度。光吸收性能、光致发光光谱、光电流和EIS实验结果表明，BZBO: 4%Dy³⁺的光催化活性增强的主要原因是BZBO中掺杂的镝不仅提高了BZBO光催化剂的光吸收能力，更促进了光生电子-空穴对的分离和转移。因此，在稀土元素和极化电场的作用下，BZBO: 4%Dy³⁺的光催化活性要高于其他所制备的样品。

关键词: 降解, 镝掺杂, Bi₂ZnB₂O₇, 催化剂, 电化学

Abstract:

A series of dysprosium doped Bi₂ZnB₂O₇(BZBO) photocatalysts were prepared by high temperature solid-state reaction. The crystal structure and morphology of BZBO: xDy³⁺ were detected by XRD, TEM and HRTEM. Effects of dysprosium doping with different concentration on their photocatalytic performance were investigated by degradation of RhB under UV light irradiation. The RhB photodegradation results revealed that the optimum photodegradation activity of Dy³⁺ doped BZBO (BZBO: 4%Dy³⁺) was 1.56 times higher than pure BZBO. The results of optical absorption indicated that the introduction of Dy³⁺ in BZBO could enhance absorption intensity in UV region and reduced forbidden band width of BZBO. The optical absorption, photoluminescence spectra, photocurrent and EIS experimental results demonstrated that the enhanced photocatalytic activity of BZBO: 4%Dy³⁺ was mainly ascribed to that the doped dysprosium in BZBO could promote the separation and transfer of photogenerated electron-hole pairs and improve photoabsorption ability of BZBO photocatalyst. Thus, BZBO: 4%Dy³⁺ exhibited the highest photocatalytic activity than that of other as-prepared samples under the effects of both rare earth elements and polarization electric field.

Key words: degradation, dysprosium doped, Bi₂ZnB₂O₇, catalyst, electrochemistry

中图分类号:

O643.36

赵文武, 周海静, 黄雁, 王秀文, 郝斌, 刘剑. 稀土掺杂硼酸盐Bi₂ZnB₂O₇: xDy³⁺光催化剂的合成及其催化机理[J]. 化工进展, 2022, 41(11): 5843-5849.

ZHAO Wenwu, ZHOU Haijing, HUANG Yan, WANG Xiuwen, HAO Bin, LIU Jian. Photocatalytic mechanism and synthesis of rare earth doped borate Bi₂ZnB₂O₇: xDy³⁺ photocatalyst[J]. Chemical Industry and Engineering Progress, 2022, 41(11): 5843-5849.

图/表 12

图1 BZBO:xDy3+（x=0，2%，4%，6%，8%）样品的XRD图谱

表1 BZBO:xDy3+（x=0，2%，4%，6%，8%）样品的晶胞参数

催化剂	a/Å	b/Å	c/Å	V/Å³
BZBO	10.8256	11.0324	4.8860	583.537
BZBO：2%Dy³⁺	10.8230	11.0309	4.8841	583.093
BZBO：4%Dy³⁺	10.8215	11.0218	4.8859	582.738
BZBO：6%Dy³⁺	10.8212	11.0215	4.8855	582.675
BZBO：8%Dy³⁺	10.8192	11.0202	4.8837	582.292

图2 BZBO和BZBO:4%Dy3+样品的SEM图谱

图3 BZBO:4%Dy3+样品的EDS图谱

图4 BZBO:4%Dy3+粉体与BZBO粉体的TEM和HRTEM图

图5 BZBO:xDy3+样品的吸收光谱及吸收[(αhν)1/2]与能量(hν)的关系图

图6 BZBO:xDy3+样品的光催化性能

表2 不同光催化剂的k和R2值

催化剂	k/min^-1	R²
BZBO	0.0639	0.96034
BZBO：2%Dy³⁺	0.0798	0.8986
BZBO：4%Dy³⁺	0.179	0.94955
BZBO：6%Dy³⁺	0.103	0.99378
BZBO：8%Dy³⁺	0.134	0.95315

图7 BZBO和BZBO:4%Dy3+样品光电流-时间曲线和Nynquist图(λ=254nm, Na2SO4浓度为0.1mol/L)

图8 BZBO:4%Dy3+和BZBO样品的荧光光谱

图9 BZBO:4%Dy3+的活性物质检测

图10 BZBO:4%Dy3+的光催化反应机理

参考文献 10

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稀土掺杂硼酸盐Bi₂ZnB₂O₇: xDy³⁺光催化剂的合成及其催化机理

Photocatalytic mechanism and synthesis of rare earth doped borate Bi₂ZnB₂O₇: xDy³⁺ photocatalyst

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