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Preparation method and application of visible light and Fenton composite catalyst

A composite catalyst, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor photocatalytic performance and insufficient reactivity, and achieve large specific surface area and visible light response frequency. Wide range and high light conversion efficiency

Inactive Publication Date: 2018-01-26
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

[0027] A preparation method of visible light Fenton composite catalyst, comprising the following steps:

[0028] (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;

[0029] (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;

[0030] (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 8.5, 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;

[0031] (4) After the reaction kettle i...

Embodiment 2

[0035] A preparation method of visible light Fenton composite catalyst, comprising the following steps:

[0036] (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;

[0037] (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, and the addition amount of isobutanol is every 1mmolNa 2 WO 4 2H 2 Add 10mL of O and stir evenly to obtain solution B;

[0038] (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;

[0039] (4) After the rea...

Embodiment 3

[0042] A preparation method of visible light Fenton composite catalyst, comprising the following steps:

[0043] (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;

[0044] (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;

[0045] (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;

[0046] (4) After the reaction k...

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Abstract

The invention provides a preparation method and an application of a visible light and Fenton composite catalyst and belongs to the technical field of photocatalyst preparation. The method comprises the following steps: soluble ferrous salt and soluble lithium salt are weighed in a mole ratio and added to deionized water; tungstate M2WO4.2H2O is weighed and added to deionized water; the prepared solutions are uniformly mixed, the mole ratio of ferrous ions, lithium ions and tungsten ions is enabled to be 2:2:1, then a sodium hydroxide solution is added to enable the solution to be alkaline, andthe mixed solution is transferred into a hydrothermal reactor for a reaction; centrifugal separation is performed after the reaction, precipitates obtained through centrifugation are washed and dried, and Li2Fe2WO7 powder is obtained; the Li2Fe2WO7 powder and nano-SnO2 are uniformly mixed, the mixture is subjected to ball milling and roasting, and the composite catalyst SnO2 / Li2Fe2WO7 powder is obtained. The composite catalyst prepared with the method has better visible-light catalytic activity and high pollutant degradation rate 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 composite 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. Intr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J37/10B01J37/08C02F1/30C02F1/72C02F101/30
Inventor 周开珍
Owner 周开珍
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