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Preparation method and application of visible light Fenton catalyst

A catalyst and visible light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of insufficient reactivity and poor photocatalytic performance, and achieve a wide range of visible light response frequency, large Good specific surface area and good stability

Inactive Publication Date: 2018-02-09
周开珍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] FeWO 4 It is a material with broad application prospects in the fields of optics, electricity, magnetism, conductor / superconductor, catalysis, and biology. Research hotspots for scientific researchers, but the current FeWO 4 Its photocatalytic performance is poor, and its reactivity in the visible light Fenton reaction is insufficient. Studies have found that its photo-Fenton reaction activity can be improved by doping and modifying it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of visible light Fenton composite catalyst, comprising the following steps:

[0024] (1) Take ferrous nitrate and lithium nitrate and add them to deionized water, so that the molar ratio of ferrous ions and lithium ions is 1:1, stir and dissolve to obtain solution A;

[0025] (2) Weigh Li 2 WO 4 2H 2 O was added to deionized water, stirred and dissolved to obtain Li 2 WO 4 solution, to Li 2 WO 4 Add isobutanol in the solution, the addition of isobutanol is every 1mmolM 2 WO 4 2H 2 O was added to 8mL, and stirred evenly to obtain solution B;

[0026] (3) Slowly add solution A to solution B and stir evenly so that the molar ratio of ferrous ions, lithium ions and tungsten ions is 2:2:1, then add sodium hydroxide solution to adjust the pH of solution B to 8.5, The mixture C was obtained, and the mixture C was transferred to a hydrothermal reactor and sealed, and reacted at 190° C. for 18 hours;

[0027] (4) After the reaction kettle is natur...

Embodiment 2

[0030] A preparation method of visible light Fenton composite catalyst, comprising the following steps:

[0031] (1) Take ferrous chloride and lithium nitrate and add them to deionized water, so that the molar ratio of ferrous ions and lithium ions is 1:1, stir and dissolve to obtain solution A;

[0032] (2) Weigh tungstate Na 2 WO 4 2H 2 O was added to deionized water, stirred and dissolved to obtain Na 2 WO 4 solution, to Na 2 WO 4 Add isobutanol in the solution, the addition amount of isobutanol is every 1mmol Na 2 WO 4 2H 2 Add 10mL of O and stir evenly to obtain solution B;

[0033] (3) Slowly add solution A to solution B and stir evenly so that the molar ratio of ferrous ions, lithium ions and tungsten ions is 2:2:1, then add sodium hydroxide solution to adjust the pH value of solution B to 8.8, The mixture C was obtained, and the mixture C was transferred to a hydrothermal reactor and sealed, and reacted at 195° C. for 16 hours;

[0034] (4) After the reactio...

Embodiment 3

[0036] A preparation method of visible light Fenton composite catalyst, comprising the following steps:

[0037] (1) Take ferrous sulfate and lithium nitrate and add them to deionized water, so that the molar ratio of ferrous ions and lithium ions is 1:1, stir and dissolve to obtain solution A;

[0038] (2) Weigh tungstate K 2 WO 4 2H 2 O was added to deionized water, stirred and dissolved to obtain K 2 WO 4 solution, to K 2 WO 4 Add isobutanol in the solution, the addition of isobutanol is every 1mmolK 2 WO 4 2H 2 O was added to 12mL and stirred evenly to obtain solution B;

[0039] (3) Slowly add solution A to solution B and stir evenly so that the molar ratio of ferrous ions, lithium ions and tungsten ions is 2:2:1, then add sodium hydroxide solution to adjust the pH value of solution B to 9.0, The mixture C was obtained, and the mixture C was transferred to a hydrothermal reactor and sealed, and reacted at 200° C. for 12 hours;

[0040] (4) After the reaction ke...

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Abstract

The invention provides a preparation method and application of a visible light Fenton catalyst and belongs to the technical field of preparation of photocatalysts. The method comprises the following steps: weighing soluble ferrous salt and soluble lithium salt according to the molar ratio, and adding the soluble ferrous salt and the soluble lithium salt into deionized water; weighing tungstate M2WO4.2H2O, and adding the tungstate M2WO4.2H2O into the deionized water; uniformly mixing the prepared solutions, and enabling ferrous ions, lithium ions and tungsten ions to be proportioned at 2 to 2 to 1; then adding a sodium hydroxide solution, enabling the solution to be alkaline and transferring a mixed solution into a hydrothermal reactor for reacting; after the reaction is finished, centrifugally separating, and washing and drying precipitation obtained by centrifuging to obtain visible light Fenton catalyst Li2Fe2WO7 powder. According to the method, the Li2Fe2WO7 is synthesized by adopting a hydrothermal method; the preparation method is simple and controllable; the obtained product has better visible light catalytic activity and can be used for treating organic wastewater.

Description

【Technical field】 [0001] The invention relates to the technical field of photocatalyst preparation, in particular to a preparation method and application of a visible light Fenton catalyst. 【Background technique】 [0002] The development of green, efficient, economical and less secondary pollution environmental purification technology is an important research field of environmental pollution control and prevention technology. Photocatalytic technology achieves efficient degradation of organic pollutants by utilizing hydroxyl radicals generated during the reaction process, but most of the previous photocatalytic technologies use ultraviolet light as the excitation source, which has high cost, low light utilization efficiency, and natural sunlight Mid-ultraviolet light only accounts for <5%. In recent years, the use of solar photocatalysis to treat refractory organic pollutants in wastewater has attracted widespread attention from scholars at home and abroad. Introducing vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J35/10B01J37/03B01J37/10C02F1/30C02F1/72C01G49/00C02F101/30
CPCC01G49/009C02F1/30C02F1/725B01J23/002B01J23/888B01J37/031B01J37/10C02F2101/30C02F2305/026C02F2305/10B01J2523/00B01J35/60B01J35/39B01J2523/11B01J2523/69B01J2523/842
Inventor 周开珍
Owner 周开珍
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