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Ionic crystal visible light catalyst based on dawson type polytungstate and preparation method thereof

A technology of ionic crystals and polytungstate, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the difficulty of catalyst separation and recovery and reduce photocatalytic reactions Quantum efficiency, low light quantum efficiency and other problems, to achieve the effect of enriching varieties and solving the difficulty of recycling and separation

Inactive Publication Date: 2014-10-08
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 visible light catalyst based on dawson type polytungstate and preparation method thereof
  • Ionic crystal visible light catalyst based on dawson type polytungstate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: get 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

[0020] Embodiment 2: get 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

[0021] Embodiment 3: get 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 specifically relates to an ionic crystal visible light catalyst based on Dawson type polytungstate and W / Ni heteronuclear metal clusters and a preparation method thereof. Salt, trishydroxymethylaminomethane, potassium carbonate and hydrochloric acid are used as raw materials and prepared by hydrothermal method. The invention can be used for the degradation of methylene blue and organic dyes with the same chromogenic group, and the decolorization rate of methylene blue can reach 97.8%. The material has obvious absorption in the visible light region, which can make up for the shortcoming that the general polyacid-based photocatalyst only shows catalytic activity under ultraviolet light irradiation. At the same time, it is difficult to dissolve in water, which overcomes the shortcomings of polyacid photocatalysts that are easily soluble in polar solvents and difficult to recycle, so it has an important application prospect 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. Background technique [0002] 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 the major ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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