薄荷碳点/TiO<sub>2</sub>复合光催化剂的制备及其性能研究

张英; 任旺; 郑兴文; 周慧眠; 瞿香; 李敏娇

doi:10.7513/j.issn.1004-7638.2024.03.011

薄荷碳点/TiO₂复合光催化剂的制备及其性能研究

doi: 10.7513/j.issn.1004-7638.2024.03.011

张英^1,,
任旺¹,
郑兴文¹,
周慧眠¹,
瞿香¹,
李敏娇^2, ,

1.
四川轻化工大学化学与环境工程学院, 四川自贡 643000
2.
四川轻化工大学化学工程学院, 四川自贡 643000

基金项目: 钒钛资源综合利用四川省重点实验室项目(2018FTSZ15, 2020FTSZ04)；乡村低成本环境治理技术四川省高校重点实验室开放项目（XCH2022ZB-04）；四川轻化工大学大学生创新基金项目（S20221062209）。

详细信息

作者简介:
张英，1980年出生，女，四川简阳人，副教授，主要从事光电分析及光电催化研究，E-mail：zhyrw@163.com

通讯作者:
李敏娇，1965年出生，女，江西泰和人，教授，主要从事光电催化研究，E-mail：lmj0621@126.com

中图分类号: TF823,TQ426
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出版历程
- 收稿日期: 2024-01-17
- 刊出日期: 2024-07-02

Study on preparation and photocatalytic performance of mint carbon dots/TiO₂ composite photocatalyst

1.
College of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China
2.
College of Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China

摘要

摘要: 以薄荷粉为生物碳源，采用一步水热法成功制备出薄荷碳点/TiO₂复合光催化剂。利用X射线衍射仪(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)、孔隙比表面分析仪(BET)、表面光电压(SPS)对薄荷碳点/TiO₂复合光催化剂的结构、形貌、比表面积及光生电荷分离特性进行了表征；考察了薄荷碳点/TiO₂复合光催化剂对模拟污染物罗丹明B(RhB)的催化降解性能。结果表明，薄荷碳点改善了TiO₂的光催化性能，超氧自由基•O₂⁻是薄荷碳点/TiO₂复合催化剂光催化降解反应中的主要活性自由基。与纯TiO₂样品相比，2%薄荷碳点/TiO₂的复合光催化剂的光生电子-空穴分离速率最高，对RhB表现出最好的脱色性能，光催化活性提高了2.24倍。
- 复合光催化剂 /
- TiO₂ /
- 薄荷粉 /
- 水热法 /
- 降解性能
Abstract: In this study, mint powder was employed as biological carbon source to prepare mint carbon dots (mint-CDs)/TiO₂ composite photocatalyst by a one-step hydrothermal method. The structure, morphology, specific surface area and photogenerated charges separation characteristics were carefully investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET) method, and surface photovoltage spectroscopy (SPS). Rhodamine B (RhB) was employed as model pollutant to study the photocatalytic activities of mint-CDs/TiO₂ photocatalysts. The results show that mint-CD improve the photocatalytic activity of TiO₂, and superoxide free radical •O₂⁻ is the main active free radical in the photocatalytic degradation reaction. When the mass ratio of mint-CDs/TiO₂ is 2%, the composite photocatalyst demonstrates the maximum photogenerated charges separation efficiency and degradation activity for RhB, and the photocatalytic activity was increased by 2.24 times compared with reference TiO₂.
- composite photocatalyst /
- TiO₂ /
- mint powder /
- hydrothermal method /
- photocatalytic performance

HTML全文

图 1 (a) 薄荷碳点/TiO₂复合催化剂的XRD谱；(b) 复合催化剂XRD谱的局部放大

Figure 1. (a) XRD patterns of mint CDs/TiO₂ composite photocatalysts with different mass ratio;(b) The enlarged XRD patterns of composite photocatalysts

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图 2 (a) 纯TiO₂ 和(b) 2%薄荷碳点/TiO₂催化剂的SEM形貌

Figure 2. SEM images of (a) TiO₂ and (b) 2% mint CDs/TiO₂

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图 3 TiO₂与薄荷碳点/TiO₂的红外光谱（插图为薄荷碳点荧光照片）

Figure 3. FT-IR spectra of mint CDs/TiO₂ and TiO₂, inset is photograph of mint carbon dots under irradiation of a 365 nm UV lamp

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图 4 不同质量比薄荷碳点/TiO₂复合催化剂SPS图谱

Figure 4. Surface photovoltage response of mint CDs/TiO₂ photocatalysts with different mass ratio

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图 5 不同催化剂光催化降解RhB活性（500 W氙灯照射240 min）

Figure 5. Decolorization efficiency of RhB over mint CDs/TiO₂ photocatalysts with different mass ratio

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图 6 催化剂降解RhB的(a)浓度随时间变化和(b)一级反应拟合曲线

Figure 6. Photocatalytic destruction of RhB with different samples (a); and (b) fitted first-order kinetic curve of RhB over different samples

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图 7 (a) 不同捕获剂对2% 薄荷碳点/TiO₂催化RhB脱色率的影响; (b) NBT在不同催化剂体系中可见光照4 h后紫外-可见吸收光谱 (RhB初始浓度为10 mg/L)

Figure 7. (a) Effect of different scavengers on decolorization efficiency of RhB over 2% mint CDs/TiO₂; (b) UV-Vis spectra of NBT in different photocatalytic systems after visible light irradiation for 4 h (The initial concentration of RhB is 10 mg/L)

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表 1 不同质量比薄荷碳点/TiO₂光催化剂的比表面积

Table 1. Specific surface of mint CDs/TiO₂ composite photocatalysts with different mass ratio

薄荷/TiO₂(质量比) 比表面积 /(m²·g⁻¹)

0∶100 115.4

1.0∶100 154.4

2.0∶100 162.0

3.0∶100 160.8

4.0∶100 155.3

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