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Preparation method of phosphotungstic acid @MIL(Fe) photocatalyst

A photocatalyst, a certain amount of phosphotungstic acid technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve low quantum efficiency, separation recovery and recycling Difficult to use, high pH requirements of the reaction system, etc., to achieve the effects of no secondary pollution, easy centrifugal recovery, and easy promotion

Inactive Publication Date: 2015-12-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soluble heteropolyacids have problems such as separation, recovery and recycling difficulties, high requirements on the pH value of the reaction system, and low quantum efficiency. Therefore, the immobilization of heteropolyacids has become a research hotspot.

Method used

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  • Preparation method of phosphotungstic acid @MIL(Fe) photocatalyst
  • Preparation method of phosphotungstic acid @MIL(Fe) photocatalyst
  • Preparation method of phosphotungstic acid @MIL(Fe) photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of phosphotungstic acid@MIL-53(Fe) composite material

[0027] Ultrasonic disperse 0.498g of terephthalic acid in 15mL of DMF, then add 0.8109g of FeCl in sequence 3 ·6H 2 O and 0.162g phosphotungstic acid, stirred by magnetic force for 15min; in a Teflon-lined autoclave, reacted at 150°C for 5h; cooled to room temperature, centrifuged, washed with water and ethanol, and finally vacuum-dried at 60°C 24h; meanwhile, MIL-53(Fe) was prepared by this method.

[0028] (2) Photocatalyst performance evaluation

[0029] The organic dye rhodamine B was selected as the probe molecule to study the performance of the prepared photocatalyst. Prepare 25mL of rhodamine B dye wastewater with a concentration of 20mg / L, add a certain amount of photocatalyst, stir magnetically at room temperature, and degrade the organic pollutants in the water under the irradiation of an LED lamp 10cm above the water surface with a power of 20W and a wavelength of 450nm; Sampling was ...

Embodiment 2

[0032] (1) Preparation of phosphotungstic acid@MIL-88B(Fe) photocatalyst

[0033] Ultrasonic disperse 0.348 g terephthalic acid in 15 mL DMF and 1.2 mL 2mol / L NaOH mixed solution, then add 1.212 g Fe(NO 3 ) 3 9H 2 O and 0.405g phosphotungstic acid, magnetically stirred for 15min; reacted in a polytetrafluoroethylene-lined autoclave at 100°C for 12h; cooled to room temperature, centrifuged, washed with water and ethanol, and finally vacuum-dried at 60°C 24h; meanwhile, MIL-88B(Fe) was prepared by this method.

[0034] (2) Photocatalyst performance evaluation

[0035] With embodiment 1.

[0036] Add 5mg of phosphotungstic acid@MIL-88B(Fe), phosphotungstic acid and MIL-88B(Fe) to Rhodamine B wastewater, and after 120min degradation reaction, the degradation rates of Rhodamine B are 82.32%, 5.64% and 57.20%, respectively. %.

Embodiment 3

[0038] (1) Preparation of phosphotungstic acid@MIL-100(Fe) photocatalyst

[0039] Ultrasonic dispersion of 0.4102g trimesic acid in 15mLH 2 O, and then sequentially added 0.605gFeCl3 ·6H 2 O and 0.605g phosphotungstic acid, magnetically stirred for 15min; reacted in a Teflon-lined autoclave at 150°C for 15h; cooled to room temperature, centrifuged, washed with water and ethanol, and finally vacuum-dried at 60°C 24h; meanwhile, MIL-100(Fe) was prepared by this method.

[0040] (2) Photocatalyst performance evaluation

[0041] With embodiment 1.

[0042] Add 5mg of phosphotungstic acid@MIL-100(Fe), phosphotungstic acid and MIL-100(Fe) to Rhodamine B wastewater, and after 120min degradation reaction, the degradation rates of Rhodamine B are 95.38%, 5.64% and 53.16%, respectively. %.

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Abstract

The invention discloses a preparation method of a phosphotungstic acid @MIL(Fe) photocatalyst. The method comprises the following steps: firstly, dispersing phosphotungstic acid in a solvent; secondly, preparing MIL(Fe) through a solvothermal method so as to obtain the phosphotungstic acid @MIL(Fe) photocatalyst, wherein the phosphotungstic acid exists in a pore channel of the MIL(Fe) in a molecular state. The photocatalyst is high in catalytic activity, environmentally-friendly, easy to recover and recyclable; moreover, the method is simple in equipment requirement and convenient to operate, and has a great application prospect, and organic pollutants in water can be efficiently decomposed in a wider pH value range.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a preparation method of phosphotungstic acid@MIL(Fe) photocatalyst. Background technique [0002] Photocatalytic photocatalytic oxidation technology has good selectivity, can react at normal temperature and pressure, and has mild conditions, and can degrade organic pollutants into non-toxic and harmless inorganic substances. It is an important application prospect in the field of energy and environment. green technology. In recent years, there have been more and more research reports on the treatment of organic wastewater by photocatalytic oxidation, and various semiconductor materials are used, mainly TiO 2 , ZnO, Fe 2 o 3 , CdS, WO 3 wait. Among them WO 3 The photocatalytic stability of ZnO is good, but the activity is relatively small; the reactivity of ZnO is high, but the photostability is poor; and TiO 2 Although the photostability is good, TiO 2 It h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/34B01J35/10C02F1/30C02F1/72C02F101/38
Inventor 李祥惠国伟林岳馨馨刘中华张琪颖王瑞芹刘华
Owner UNIV OF JINAN
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