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MOF-based composite material and preparation method and application thereof

A composite material and processing method technology, applied in the field of MOF-based composite materials and their preparation, can solve the problems of unsatisfactory visible light response, increase the concentration of active substances, etc., and achieve high visible light activity and stability, low cost, and good visible light catalytic activity. and stability effects

Active Publication Date: 2020-07-03
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies have found that the visible light response of MIL-53(Fe) is not ideal, and hydrogen peroxide needs to be added to increase the concentration of active species

Method used

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  • MOF-based composite material and preparation method and application thereof
  • MOF-based composite material and preparation method and application thereof
  • MOF-based composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of MOF-based photocatalyst FePMo / MIL-53 (Fe), the steps are as follows:

[0036] (1) Disperse 0.32g ferric chloride and 0.33g terephthalic acid in 41mL N,N-dimethylformamide in sequence to obtain the MIL-53(Fe) precursor solution, which is transferred to the reaction kettle at 150 The solvothermal reaction was carried out in an oven at ℃ for 15 hours. After the reaction, it was centrifuged with methanol, dried in a vacuum oven at 80° C. for 10 h, and ground with an agate mortar to obtain MIL-53(Fe).

[0037] (2) Evenly disperse 0.034g of ferric nitrate in 20mL of methanol to obtain Fe 3+ Solution; 0.155g of phosphomolybdic acid was uniformly dispersed in 20mL of methanol to obtain a phosphomolybdic acid solution. Will Fe 3+ The solution was added dropwise into the phosphomolybdic acid solution to obtain the FePMo precursor solution.

[0038] (3) Disperse 0.2g MIL-53(Fe) evenly in the FePMo precursor solution, transfer it to the reaction kettle...

Embodiment 2

[0044] Take 0.05g of the catalyst FePMo, MIL-53(Fe) and FePMo / MIL-53(Fe) (1:10) prepared in Example 1 and dissolve in 0.5mL Nafin solution, ultrasonically disperse for 15min, and drop-coat it on the conductive glass , the size of the drop coating is 1cm×1cm, coating 2 times, each drop coating 20μL, and drying in a vacuum oven at 80°C for 1h to prepare FePMo, MIL-53(Fe) and FePMo / MIL-53(Fe) (1 :10) Electrodes.

[0045] The prepared three photocatalytic electrodes were respectively placed in 0.1mol / L Na 2 SO 4 and Na 2 SO 3 In the solution, under the 3-electrode system of the electrochemical workstation, the conductive glass coated with photocatalyst is used as the working electrode, the platinum sheet is used as the counter electrode, the Ag / AgCl electrode is used as the reference electrode, and the xenon lamp is used as the light source. Under visible light, light and dark alternate at a certain interval , to obtain the time-current curves of different photocatalysts, the ...

Embodiment 3

[0048] The electrode prepared in Example 2 was placed in 0.5M Na 2 SO 4 In the solution, electrochemical impedance spectroscopy was performed under visible light to obtain image 3 . From image 3 It can be seen that the arc radius of the electrochemical impedance spectrum of FePMo / MIL-53(Fe)(1:10) under visible light is the smallest, indicating that the introduction of FePMo into the MIL-53(Fe) framework makes the photogenerated carriers generated on the surface of the catalyst The transfer rate increases, the charge transfer resistance decreases, and the separation rate of photogenerated electrons and holes on the interface becomes faster.

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Abstract

The invention discloses an MOF-based composite material and a preparation method and application thereof. The preparation method comprises the following steps: (1) dispersing ferric nitrate in methanol to obtain a Fe<3+> solution, and dispersing phosphomolybdic acid in methanol to obtain a phosphomolybdic acid solution, (2) dropwise adding the Fe<3+> solution into the phosphomolybdic acid solutionto obtain a FePMo precursor solution, and (3) dispersing MIL-53(Fe) in the FePMo precursor solution, and carrying out a solvothermal reaction process to obtain the MOF-based photocatalyst FePMo / MIL-53(Fe). The preparation method disclosed by the invention is simple and low in cost, and the prepared MOF-based photocatalyst has very high visible light activity and stability under the mutual synergistic effect of FePMo and MIL-53(Fe). The invention further discloses a treatment method of Cr (VI)-containing wastewater, which comprises the following steps: adding the MOF-based photocatalyst FePMo / MIL-53(Fe) into the Cr (VI)-containing wastewater, carrying out dark reaction adsorption equilibrium, irradiating with visible light, and carrying out photocatalytic degradation.

Description

technical field [0001] The invention relates to the technical field of visible light catalysis, in particular to a MOF-based composite material and its preparation method and application. Background technique [0002] In recent years, water pollution has become one of the urgent problems to be solved in environmental governance. Toxic heavy metals in water have become an important reason for the high incidence of human and aquatic animals. Taking heavy metal Cr as an example, it is widely used as a raw material in leather, electroplating, printing and dyeing, rubber and other industries, and produces a large amount of chromium-containing wastewater. In nature, chromium exists in the form of zero-valent chromium (Cr), divalent chromium (Cr(II)), trivalent chromium (Cr(III)), and hexavalent chromium (Cr(VI)). Trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) exist in the form. Among them, hexavalent chromium (Cr(VI)) is the most toxic, about 100 times more toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/34B01J31/22C02F1/30C02F101/22
CPCB01J31/34B01J31/1691B01J31/223C02F1/30B01J2531/842C02F2101/22C02F2305/10B01J35/39Y02W10/37
Inventor 王齐岑檠郭佳允钟腾辉贺琴陈瀚遐
Owner ZHEJIANG GONGSHANG UNIVERSITY
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