Double Polyoxometalates⁃Based Metal⁃Organic Framework with Photocatalytic Degradation Properties

doi:10.12422/j.issn.1672-6952.2023.04.008

Abstract

Abstract:

A double polyoxometalates?based composite catalyst material was prepared by Mechanochemistry. In order to compare with the double polyoxometalates?based composite catalyst material, one polyoxometalates?based were prepared by the same method. The structures of these catalysts were characterized by X?ray powder diffraction, Fourier transform infrared spectroscopy, and liquid ultraviolet spectroscopy. The photocatalytic degradation of rhodamine B (RhB) was selected as a model reaction to evaluate its photocatalytic activity and the possible mechanism were further explored in the degradation process. The results indicate that the degradation efficiency of H₃PMo₁₂O₄₀&H₄SiW₁₂O₄₀@MOF?199 is 92% while irradiating in simulated sunlight for 60 minutes, which is superior to that of the corresponding single POMs catalysts H₃PMo₁₂O₄₀ or H₄SiW₁₂O₄₀@MOF?199 and has a good cycling activity. The synergistic effect of the good photocatalytic activity of polyoxotungstates and the good oxidation?reduction ability of polyoxomolybdates, which provides a new vision for designing diverse POMs@MOFs composite catalysts with different catalytic properties.

Key words: Polyoxometalates, Metal?organic framework, Mechanochemistry, Photocatalysis, Dye degradation

摘要：

通过机械化学法，制备了一种双多酸修饰的复合型催化剂材料（H₃PMo₁₂O₄₀&H₄SiW₁₂O₄₀@MOF?199）。为了与双多酸修饰的复合型催化剂材料进行对比，通过相同的方法制备了单组分多酸复合物PMo₁₂O₄₀@MOF?199和H₄SiW₁₂O₄₀@MOF?199。通过X?射线粉末衍射、傅里叶红外光谱及液体紫外光谱，对上述材料的结构进行了表征，并以光催化降解罗丹明B（RhB）的反应为模型反应，评价了其光催化活性，探究了降解的可能机理。结果表明，在模拟太阳光下照射60 min，H₃PMo₁₂O₄₀&H₄SiW₁₂O₄₀@MOF?199对RhB的降解率约为92%，优于单组分多酸复合物对RhB的降解率，且具有良好的循环活性；多钨酸的光活性和多钼酸的氧化还原性在光催化染料的反应中起了协同作用。研究结果为设计具有不同催化特性的多种类多酸基金属有机框架复合催化剂提供了新思路。

关键词: 多酸, 金属有机框架, 机械化学, 光催化, 染料降解

CLC Number:

TQ110

Xiangyu Ren, Baokuan Chen, Jing Sun, Yanfeng Bi. Double Polyoxometalates⁃Based Metal⁃Organic Framework with Photocatalytic Degradation Properties[J]. Journal of Liaoning Petrochemical University, 2023, 43(4): 51-58.

任翔宇, 陈宝宽, 孙京, 毕研峰. 双多酸基金属有机框架材料的合成及其光催化降解性能[J]. 辽宁石油化工大学学报, 2023, 43(4): 51-58.

Figures/Tables 12

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