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Preparation method and application of tungsten-molybdenum disulfide composite photocatalyst

A technology of sulfide and composite light, applied in the field of photocatalysis, can solve the problem of less reporting of gaseous pollutants, and achieve the effects of good photocatalysis response, reduced load rate, and large specific surface area.

Active Publication Date: 2020-10-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When they are bulk structures, their energy bands belong to the indirect bandgap, which are 1.2eV (MoS2) and 1.4eV (WS2), respectively. When they are stripped When it is a nanosheet, the bandgap changes from an indirect bandgap to a direct bandgap, which are 1.8eV (MoS2) and 1.9eV (WS2) respectively, which has a new and its photocatalytic removal of gaseous pollutants is relatively seldom reported, especially the catalytic oxidation of gaseous elements mercury (Hg0) and AsH3 at the same time The photocatalyst has not been reported

Method used

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  • Preparation method and application of tungsten-molybdenum disulfide composite photocatalyst
  • Preparation method and application of tungsten-molybdenum disulfide composite photocatalyst
  • Preparation method and application of tungsten-molybdenum disulfide composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: The preparation method of this tungsten-molybdenum disulfide composite photocatalyst is as follows:

[0031] (1) Under the condition of magnetic stirring, tungsten chloride (hexachloro Tungsten chloride), ammonium molybdate, and thiourea were added to deionized water to dissolve, and kept stirring;

[0032] (2) Stir the solution in step (1) until the color no longer deepens to obtain a mixed solution;

[0033] (3) Put the mixed solution of step (2) in a 100mL digestion tank, and microwave digestion for 40min at a temperature of 180°C (heating rate: 10°C / min), cool down, take out the precipitate, and wash with deionized water and After washing with absolute ethanol to remove surface ions, dry at 60°C to obtain a tungsten-molybdenum disulfide composite photocatalyst;

[0034] Catalytic performance test: Weigh 0.1g of the disulfide composite catalyst prepared in this example, and use it for photocatalytic removal of Hg in simulated flue gas under ultraviole...

Embodiment 2

[0035] Embodiment 2: The preparation method of this tungsten-molybdenum disulfide composite photocatalyst is as follows:

[0036] (1) Under the condition of magnetic stirring, the molar ratio of Mo ions, W ions and S ions is 6.5:4:21, adding tungsten chloride, ammonium molybdate, and thiourea to deionized water for dissolution, and keep stirring;

[0037] (2) Stir the solution in step (1) until the color no longer deepens to obtain a mixed solution;

[0038] (3) Put the mixed solution in step (2) in a 100mL digestion tank, and digest it with microwave for 40min at a temperature of 150°C, 180°C, and 200°C (the heating rate is 10°C / min), cool down, take out the precipitate, and then After washing with deionized water and absolute ethanol to remove surface ions, dry at 60°C to obtain a tungsten-molybdenum disulfide composite photocatalyst;

[0039] Catalytic performance test: Weigh 0.1g of the disulfide composite catalyst prepared in this example, and use it for photocatalytic re...

Embodiment 3

[0040] Embodiment 3: The preparation method of this tungsten-molybdenum disulfide composite photocatalyst is as follows:

[0041] (1) Under the condition of magnetic stirring, the molar ratio of Mo ion, W ion and S ion is 6.5:4:21, add tungsten hexacarbonyl, sodium molybdate and sodium sulfide to deionized water respectively for dissolution, and keep stirring;

[0042] (2) Stir the solution in step (1) until the color no longer deepens to obtain a mixed solution;

[0043] (3) Put the mixed solution of step (2) in a 100mL digestion tank, and microwave digestion at 180°C (heating rate: 10°C / min) for 20min, 40min and 60min, cool down, take out the precipitate, and use it in sequence After washing with deionized water and absolute ethanol to remove surface ions, dry at 60°C to obtain a tungsten-molybdenum disulfide composite photocatalyst;

[0044] Table 1 MoS prepared at different digestion times 2 / WS 2 List of specific surface area, pore volume and average pore diameter

...

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Abstract

The invention discloses a preparation method of a tungsten-molybdenum disulfide composite photocatalyst, and belongs to the technical field of photocatalysts. The preparation method comprises the following steps: under a stirring condition, respectively adding tungsten salt, molybdate and a sulfur source into deionized water for dissolving, and stirring until the color of the solution is not deepened, so as to obtain a mixed solution; and putting the mixed solution into a digestion tank, digesting for 20-60 minutes at the temperature of 150-200 DEG C under the microwave condition, carrying outcooling, taking out precipitates, washing the precipitates with deionized water and absolute ethyl alcohol in sequence, and carrying out drying to obtain the tungsten-molybdenum disulfide composite photocatalyst. According to the present invention, the prepared catalyst can remove gaseous heavy metal pollutants in the presence of ultraviolet light, the preparation method has characteristics of simple operation, economy and environmental protection, and the prepared catalyst has high utilization value in the field of removal of heavy metal pollutants in reductive flue gas.

Description

technical field [0001] The invention relates to a preparation method of a disulfide high-efficiency adsorption synergistic photocatalytic material for removing gaseous heavy metals in reducing flue gas, and belongs to the technical field of photocatalysis. Background technique [0002] Heavy metal pollution seriously affects human health and environmental safety. Atmospheric heavy metal pollution is an important form of heavy metal pollution. Heavy metal pollution in the atmosphere has the characteristics of strong migration and wide coverage, causing direct harm to human health, and has the characteristics of non-degradability, biotoxicity and bioaccumulation. Heavy metal pollution in reducing flue gas is serious. Taking yellow phosphorus tail gas as an example, about 2500~3000 mg / m3 is produced per 1 ton of yellow phosphorus 3 Exhaust gas, which contains mercury 40~400μg / m 3 , Arsenic 80~180mg / m 3 . Mercury and arsenic in yellow phosphorus tail gas mainly come from pho...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J37/10B01J37/34B01D53/86B01D53/64
CPCB01J27/051B01J37/346B01J37/10B01D53/8665B01D2257/602B01D2257/60B01D2258/0283B01J35/39
Inventor 王学谦蔡君夏仡宁平王郎郎
Owner KUNMING UNIV OF SCI & TECH