CoFe<sub>2</sub>O<sub>4</sub>/BiOI磁性光催化剂的制备及其六价铬去除应用

叶恒暄; 季璇; 李芷妍; 方青; 张慧青; 黄婷婷; 杨靖霞

doi:10.12299/jsues.21-0259

CoFe₂O₄/BiOI磁性光催化剂的制备及其六价铬去除应用

doi: 10.12299/jsues.21-0259

1.
上海工程技术大学化学化工学院, 上海 201620
2.
河南省科学院化学研究所有限公司, 郑州 450002

基金项目: 国家自然科学基金项目资助（21601121）；上海工程技术大学大学生创新训练项目资助（cx2004009）

详细信息

作者简介:
叶恒暄（2000−），女，在读本科生，研究方向为环境工程. E-mail：041518128@sues.edu.cn

通讯作者:
杨靖霞（1983−），女，教授，博士，研究方向为功能性无机材料制备级应用. E-mail: yjx09tj@foxmail.com

中图分类号: O69
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-22
- 刊出日期: 2023-03-31

Preparation of CoFe₂O₄/BiOI magnetic photocatalyst and its application in Cr(VI) removal

1.
School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
2.
Institute of Chemistry Co., Ltd. Henan Academy of Sciences, Zhengzhou 450002, China

摘要

摘要: 水体中的重金属六价铬离子对人体、环境均有严重影响，其含量是水体质量优劣的重要指标之一，需要对其进行严格控制. 以BiOI为光催化剂，CoFe₂O₄（简称CFO）作为复合材料的磁性成分，合成CFO/BiOI纳米磁性光催化材料，研究不同摩尔比的CFO/BiOI对六价铬去除性能的影响. 研究发现，CFO/BiOI复合材料在六价铬催化去除中，表现出比纯CFO和BiOI更好的性能. 此外，CFO的引入赋予了材料磁性，可将催化材料通过磁力快速分离.
- 磁性纳米材料 /
- 光催化 /
- 六价铬去除
Abstract: The heavy metal hexavalent chromium (Cr(VI)) ion in water has serious impact on human body and environment, and its concentration is one of the important indicators of water quality, which needs to be strictly controlled. CFO/BiOI nanometer magnetic photocatalyst material was synthesized with BiOI as photocatalyst and CoFe₂O₄ (CFO for short) as magnetic component of composite material, and the effect of different proportion of CFO/BiOI on the removal performance of hexavalent chromium was studied. It was found that the CFO/BiOI composite exhibited better catalytic performance than pure CFO and BiOI in the application of hexavalent chromium removal. This may be caused by the construction of heterojunction between CFO and BiOI, which accelerated the charge separation. In addition, the introduction of CFO endowed the BiOI material with magnetism, which allowed rapidly separation of the catalyst through magnetic force.
- magnetic nano-material /
- photocatalysis /
- hexavalent chromium (Cr(VI)) removal

HTML全文

图 1 CFO、BiOI和CFO/BiOI复合材料的XRD曲线

Figure 1. XRD curves of CFO, BiOI and CFO/BiOI composites

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图 2 CFO、BiOI和不同比例CFO/BiOI的SEM图

Figure 2. SEM images of CFO, BiOI and CFO/BiOI composites with various ratios

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图 3 CFO、BiOI 和各比例CFO/BiOI复合物的FTIR光谱

Figure 3. FTIR spectra of CFO, BiOI and CFO/BiOI composites with various ratios

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图 4 CFO、BiOI 和CFO/BiOI复合物的UV−Vis DRS光谱及由此计算的带隙位置图

Figure 4. UV−Vis DRS spectra of CFO, BiOI and CFO/BiOI composites and band gap calculated accordingly

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图 5 CFO和BiOI的Mott−Schottky 测试结果

Figure 5. Mott−Schottky plots of CFO and BiOI

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图 6 CFO/BiOI复合光催化剂载流子分离机理

Figure 6. Carrier separation mechanism of CFO/BiOI composite-photocatalyst

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图 7 CFO、BiOI 和各比例CFO/BiOI的PL光谱

Figure 7. PL spectra of CFO, BiOI and CFO/BiOI composites with various ratios

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图 8 各比例CFO/BiOI材料的磁力分离

Figure 8. Magnetic separation of CFO/BiOI with various ratios

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图 9 CFO、BiOI和各比例CFO/BiOI的六价铬催化去除性能

Figure 9. Cr(VI) removals for CFO, BiOI and CFO/BiOI composites with various ratios

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表 1 不同比例CFO/BiOI（n(CFO)∶n(BiOI) = 1∶1~1∶6）所用物质及使用量

Table 1. Materials and amounts used for CFO/BiOI with different ratios (n(CFO)∶n(BiOI) = 1∶1~1∶6)

药品用量	m(CFO) /g	m (KI) /g	m (Bi(NO₃)₃·5H₂O) /g	V(EG·(CH₂OH)₂) /mL
CFO/BiOI(1∶1)	0.2815	0.1992	0.5821	10
CFO/BiOI(1∶2)	0.1408	0.1992	0.5821	10
CFO/BiOI(1∶4)	0.0704	0.1992	0.5821	10
CFO/BiOI(1∶6)	0.0469	0.1992	0.5821	10

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