Preparation method and application of a magnetically recyclable Fe-mof photocatalyst

A photocatalyst and magnetic recovery technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of cost suppression and insufficient photocatalytic performance of MOFs In order to achieve the effects of easy recycling, excellent visible light catalytic activity and magnetic recyclability, and low raw material prices

Active Publication Date: 2020-12-11
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite great progress so far, the photocatalytic properties of MOFs have not been fully exploited
In particular, there is still little research on the application of MOFs to the photocatalytic reduction of Cr(VI), and the recovery and separation capabilities of many MOFs photocatalysts prepared at present have not been paid attention to, and the cost problem has also inhibited the research of MOFs photocatalysts.

Method used

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  • Preparation method and application of a magnetically recyclable Fe-mof photocatalyst
  • Preparation method and application of a magnetically recyclable Fe-mof photocatalyst
  • Preparation method and application of a magnetically recyclable Fe-mof photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0044] MOF photocatalyst [Fe(2-mim) 3· nH 2 The preparation method of O], the steps are as follows:

[0045] (1) 40mmol of organic ligand 2-MI was dissolved in 50ml methanol solution, and after mixing and stirring for about 30 minutes, a uniform methanol solution of 2-MI was obtained;

[0046] (2) 4mmol Fe(NO 3 ) 3 ·9H 2 O was dissolved in 50ml methanol solution, mixed and stirred to obtain uniform Fe 3+ solution, the uniform methanol solution of 2-MI obtained in step (1) was added dropwise to Fe 3+ In the solution, the stirring reaction was performed for about 60 minutes to obtain a suspension;

[0047] (3) After the reaction product obtained in step (2) was allowed to stand at room temperature for more than 20 hours, washed with ethanol and water respectively, and then, the washed reaction product was dried under static vacuum at 80°C for 10 hours, and finally Obtained [Fe(2-mim) 3· nH 2 O] photocatalyst.

[0048] figure 1 is [Fe(2-mim) 3· nH 2 O] Image taken un...

Embodiment 2

[0050] Different organic ligands and Fe 3+ Different MOFs with Fe as the central atom can be formed. Using the reported method, by changing the organic ligands, H 2 BDC, NH 2 -H 2 MOFs were prepared with BDC and fumaric acid as organic ligands with ferric nitrate (nonahydrate).

[0051] Taking the degradation of chromium-containing Cr(VI) wastewater as an example to test the catalyst activity, 100 mg of Fe-based MOF visible light catalysts prepared in different proportions were added to the reactor with a volume of 100 mL and a concentration of 80 μmol / L chromium-containing Cr(VI) wastewater. , do not adjust the pH, continue to stir, stir in the dark for 30min to the adsorption equilibrium, turn on the visible light source, and take samples at 15min intervals.

[0052] like figure 2 , the Fe-based MOF with 2-MI as the organic ligand prepared by the present invention has the best visible light degradation Cr(VI) effect, and is the only one with magnetic properties.

Embodiment 3

[0054] Different central metal atoms and organic ligands 2-MI can form MOFs with different central metal atoms. Take M(NO 3 ) X (where M=Ce, Co, Bi, Fe, Zn) provided the central metal atom, and using methanol as the solvent, a series of MOFs with different central metal atoms were prepared by a one-step method similar to the preparation of Fe-MOF. And compare according to the chromium reduction operation of Example 2.

[0055] like image 3 , the Fe-based MOF with Fe as the central metal atom prepared by the present invention has the best visible light degradation Cr(VI) effect, and is the only one with magnetic properties.

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Abstract

The invention discloses a preparation method and application of a magnetically recyclable Fe-MOF photocatalyst. The preparation method includes: (1) dispersing 2-MI homogeneously in methanol to obtaina 2-MI solution; and dispersing Fe(NO3)3 evenly in methanol to obtain an Fe<3+> solution; (2) adding the obtained 2-MI solution into the obtained Fe<3+> solution dropwise, and stirring the solutionsevenly to obtain a suspension; and (3) carrying out standing, washing and vacuum drying on the suspension in order so as to obtain the Fe-MOF photocatalyst. The photocatalyst provided by the inventionhas the characteristics of simple preparation method, cheap raw materials, easy separation of photogenerated holes and electrons, also has certain magnetism, and can realize separation and recovery through an external magnetic field, thus having high economic benefits.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to the technical field of visible light-responsive photocatalytic materials, and in particular to a preparation method and application of a novel Fe-MOF photocatalyst. Background technique [0002] In recent years, the global environment has been seriously polluted by toxic heavy metals due to the excessive discharge of pollutants from various industrial, agricultural and mining processes. Chromium (Cr) is a common contaminant on surfaces and groundwater, and it is widely used in electroplating, leather tanning, printing, pigments, polishing and other industries. Cr(VI)-contaminated aquatic ecosystems and drinking water sources can cause severe diarrhea and bladder, liver, kidney, and skin cancers, seriously threatening the environment and human health. Even at relatively low concentrations, Cr(VI) is still very harmful to humans due to its high toxicity, carcinoge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22C02F1/30C02F1/70C08G83/00C02F101/22
CPCB01J31/1691B01J35/0033B01J35/004C02F1/30C02F1/705C02F2101/22C02F2305/10C08G83/008
Inventor 高桥远王齐吴宏李俊峰高慧敏夏文韬林大港范勇杰
Owner ZHEJIANG GONGSHANG UNIVERSITY
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