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Ionic crystal type visible-light-induced photocatalyst based on Dawson type poly-tungstate and preparation method thereof

A technology of ionic crystals and polytungstates, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of reducing the quantum efficiency of photocatalytic reactions and catalyst separation Difficult to recycle, low photon efficiency and other problems, to achieve the effect of solving the difficulty of recycle and separation and enriching varieties

Inactive Publication Date: 2013-05-22
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 The photoquantum efficiency of the photocatalytic reaction is low, and the rapid recombination of photogenerated electrons and holes inhibits the capture of carriers and the process of surface charge migration, thereby reducing the quantum efficiency of the photocatalytic reaction.
Moreover, the nano-titanium dioxide photocatalyst is dispersed in emulsion with the reaction solution during the reaction process, and the loss of the catalyst is serious.
However, heteropolyacids are very soluble in polar solvents, which brings difficulties to the separation and recovery of catalysts.

Method used

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  • Ionic crystal type visible-light-induced photocatalyst based on Dawson type poly-tungstate and preparation method thereof
  • Ionic crystal type visible-light-induced photocatalyst based on Dawson type poly-tungstate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Take sample K 12 [α-H 2 P 2 W 12 o 48 ]·24H 2 O (0.667 g), NiCl 2 ·6H 2 O (0.333 g), Tris (0.167 g) and K 2 CO 3 (0.14 g) dissolved in 8 mL of water, with 4 mol L -1 Hydrochloric acid solution to adjust the pH value of the above solution to 6.4, stir at room temperature for 4 hours, add 0.6 mL of ethylenediamine, transfer the above solution to a 18 mL autoclave, react at 180 °C for 3 days, and cool naturally to After room temperature, dark blue blocky crystals can be obtained.

Embodiment 2

[0022] Example 2: Take sample K 12 [α-H 2 P 2 W 12 o 48 ]·24H 2 O (0.667 g), Ni (NO 3 ) 2 ·6H 2 O (0.406 g), Tris (0.167 g) and K 2 CO 3 (0.14 g) dissolved in 8 mL of water, with 4 mol L -1 Hydrochloric acid solution to adjust the pH value of the above solution to 6.5, stir at room temperature for 4 hours, add 0.6 mL of ethylenediamine, transfer the above solution to a 18 mL autoclave, react at 170 °C for 3 days, and cool naturally to After room temperature, dark blue blocky crystals can be obtained.

Embodiment 3

[0023] Example 3: Take sample K 12 [α-H 2 P 2 W 12 o 48 ]·24H 2 O (0.667 g), NiCl 2 ·6H 2 O (0.333 g), Tris (0.167 g) and K 2 CO 3 (0.14 g) dissolved in 8 mL of water, with 4 mol L -1 Hydrochloric acid solution to adjust the pH value of the above solution to 6.6, stir at room temperature for 4 hours, add 0.6 mL of ethylenediamine, transfer the above solution to a 18 mL autoclave, react at 160 °C for 3 days, and cool naturally to After room temperature, dark blue blocky crystals can be obtained.

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Abstract

The invention belongs to the field of chemical material preparation, and in particular relates to an ionic crystal type visible-light-induced photocatalyst based on Dawson type poly-tungstate and W / Ni heteronuclear metal clusters, and a preparation method of the ionic crystal type visible-light-induced photocatalyst. The ionic crystal type visible-light-induced photocatalyst is prepared by using six-absence tungsten phosphate, nickel salt, trihydroxymethyl amino methane, potassium carbonate and hydrochloric acid as the raw materials and using a hydrothermal method. The ionic crystal type visible-light-induced photocatalyst can be used for degrading methylene blue and organic dyes with the same chromophores as the methylene blue, and the decolourization ratio of the methylene blue can be 97.8%. The photocatalyst has remarkable absorption effect in a visible light area, so that the defect that the ordinary poly-acid base photocatalyst shows the catalytic activity only when being radiated by ultraviolet rays is overcome; and meanwhile the photocatalyst is insoluble in water, and the defects that the poly-acid photocatalyst is easy to be dissolved in polar solvents and hard to recycle are overcome, so that the photocatalyst has significant application prospects in the treatment of industrial dye wastewater.

Description

technical field [0001] The invention belongs to the field of chemical material preparation, and relates to an ion crystal visible light catalyst based on Dawson type polytungstate and W / Ni heteronuclear metal clusters and a preparation method thereof. [0002] Background technique [0003] After entering the 21st century, the control and treatment of environmental pollution is a major issue that human society needs to solve urgently. At the same time, solar energy has become an ideal renewable energy because of its clean, efficient and inexhaustible characteristics. Using the energy provided by sunlight to degrade organic pollution in wastewater is a completely sustainable development and utilization process, and the key to realizing this process is the acquisition of high-performance photocatalysts. Therefore, the development and utilization of new and efficient photocatalysts that can absorb and utilize visible light accounting for more than 45% of solar energy is one of ...

Claims

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Application Information

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IPC IPC(8): B01J31/34C02F1/30
CPCY02W10/37
Inventor 姚爽张志明王恩波刘竹君
Owner CHANGCHUN UNIV OF SCI & TECH
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