FeVO4/Cu3(BTC)2(H2O)3异质结制备及光催化性能

刘颖琪; 翁文斌; 岑檠; 肖维; 王齐; 丛燕青; 张轶

doi:10.13801/j.cnki.fhclxb.20200917.001

FeVO₄/Cu₃(BTC)₂(H₂O)₃异质结制备及光催化性能

doi: 10.13801/j.cnki.fhclxb.20200917.001

浙江工商大学　环境科学与工程学院，杭州 310018

基金项目: 国家自然科学基金(21876154)；浙江省自然科学基金(LR18B070001)

详细信息

通讯作者:
王齐，博士，教授，研究方向为光催化　E-mail：wangqi8327@zjgsu.edu.cn

中图分类号: O643
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出版历程
- 收稿日期: 2020-07-23
- 录用日期: 2020-09-15
- 网络出版日期: 2020-09-17
- 刊出日期: 2020-12-15

Preparation and photocatalytic properties of FeVO₄/Cu₃(BTC)₂(H₂O)₃ heterojunction

School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China

摘要

摘要: 以Cu片和1, 3, 5-苯三甲酸为原料，电化学法制备经典Cu-MOF材料Cu₃(BTC)₂(H₂O)₃，即HKUST-1，作为基底金属有机框架材料(MOFs)，采用室温沉积法制备FeVO₄/HKUST-1异质结复合材料，通过XRD、SEM、BET、UV-Vis DRS等对其晶体结构、形貌、比表面积、光吸收性能等进行了表征。结果表明：FeVO₄与HKUST-1复合形成异质结后，有利于光生电子-空穴的产生和转移，对目标染料污染物罗丹明B(RhB)的降解性能显著增强。可见光照射120 min后，异质结体系中RhB的降解率可达93%，而单一FeVO₄或HKUST-1体系中仅为12%和5%。此外，对材料的组成比例进行了优化，当FeVO₄与HKUST-1摩尔比为1∶1时，制备的FeVO₄/HKUST-1复合材料具有最佳的光催化性能。进一步，考察了其循环使用的稳定性，循环5次后对RhB的降解效率仍保持在90%以上，稳定性良好。
- 金属有机骨架(MOFs) /
- FeVO₄ /
- 电化学法 /
- 复合材料 /
- 光催化
Abstract: The classic Cu-MOF material Cu₃(BTC)₂(H₂O)₃, which was also named HKUST-1, was prepared by electrochemical method using Cu flakes and 1, 3, 5-benzenetricarboxylic acid as the raw materials. Furthermore, the FeVO₄/HKUST-1 heterojunction composites were prepared by room temperature deposition using HKUST-1 as the base metal organic framework material (MOFs). The crystal structure, morphology, specific surface area and optical absorption properties were characterized by XRD, SEM, BET, UV-Vis DRS, etc. The results indicate that the formation of the heterojunction between FeVO₄ and HKUST-1 is beneficial for the generation and transfer of the photogenerated electron-hole pairs. The degradation performance of target dye pollutant rhodamine B (RhB) is significantly enhanced. After visible light irradiating for 120 min, the degradation efficiency to RhB can reach 93% in the heterojunction system, while only 12% and 5% can be observed in the system of FeVO₄or HKUST-1, respectively. In addition, the composition ratio of the composite was also optimized. When the molar ratio of FeVO₄ to HKUST-1 is 1∶1, the as-prepared FeVO₄/HKUST-1 composite has the best photocatalytic performance. Furthermore, the stability was investigated. After 5 cycles, the degradation efficiency to RhB is still above 90%, indicating good stability of the FeVO₄/HKUST-1 composite.
- metal organic framework material (MOFs) /
- FeVO₄ /
- electrochemical method /
- composite /
- photocatalysis

HTML全文

图 1 FeVO₄、HKUST-1和FeVO₄/HKUST-1的XRD图谱

Figure 1. XRD patterns of FeVO₄, HKUST-1 and FeVO₄/HKUST-1

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图 2 FeVO₄(a)、HKUST-1(b)、FeVO₄/HKUST-1((c),(d))的SEM图像

Figure 2. SEM images of FeVO₄(a), HKUST-1 (b) and FeVO₄/HKUST-1 ((c), (d))

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图 3 FeVO₄、HKUST-1和FeVO₄/HKUST-1的吸附-脱附曲线

Figure 3. Adsorption-desorption isotherms of FeVO₄, HKUST-1 and FeVO₄/HKUST-1

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图 4 FeVO₄、HKUST-1和FeVO₄/HKUST-1的TAG曲线

Figure 4. TGA curves of FeVO₄, HKUST-1 and FeVO₄/HKUST-1

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图 5 FeVO₄、HKUST-1、FeVO₄/HKUST-1的紫外/可见漫反射光谱(a)及带隙图(b)

Figure 5. UV-Vis DRS (a) and band gap (b) of FeVO₄, HKUST-1 and FeVO₄/HKUST-1

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图 6 FeVO₄、HKUST-1、FeVO₄/HKUST-1的光电流(a)和交流阻抗谱(b)

Figure 6. Photocurrent (a) and EIS Nyquist plots (b) of FeVO₄, HKUST-1 and FeVO₄/HKUST-1

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图 7 不同比例的FeVO₄/HKUST-1对RhB的降解动力学曲线(a)和准一级动力常数拟合(b)

Figure 7. Degradation (a) and pseudo-first-order kinetic curves (b) of RhB with different proportions of FeVO₄/HKUST-1

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图 8 可见光下FeVO₄/HKUST-1催化剂光催化降解不同污染物的效果

Figure 8. Reduction of different dyes by FeVO₄/HKUST-1 under visible light irradiation

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图 9 不同pH下FeVO₄/HKUST-1对RhB的降解动力学曲线

Figure 9. Degradation kinetics curves of RhB under different pH values

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图 10 FeVO₄/HKUST-1降解染料循环稳定性

Figure 10. Stability of FeVO₄/HKUST-1 for degradation of dye

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图 11 HKUST-1和FeVO₄的Mott-Schottky曲线

Figure 11. Mott-Schottky plots of HKUST-1 and FeVO₄

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图 12 不同光催化捕获剂的捕获效率(a) 和FeVO₄/HKUST-1在可见光下照射的ESR图谱(b)

Figure 12. Removal efficiency with addition of different scavengers (a) and ESR signals of FeVO₄/HKUST-1 under visible light (b)

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图 13 FeVO₄/HKUST-1光催化降解RhB反应机制示意图

Figure 13. Proposed mechanism for photocatalytic reduction of RhB by FeVO₄/HKUST-1

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