Photocatalytic metal dissolution method

A photocatalysis and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of strong chlorine toxicity, cumbersome steps, environmental hazards, etc.

Active Publication Date: 2020-10-23
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steps are cumbersome, the process also needs to be heated and pressurized, and chlorine gas is extremely toxic, which is harmful to the environment

Method used

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  • Photocatalytic metal dissolution method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Disperse 500mg of a material containing 1% platinum into a mixed solution of 50ml of acetonitrile and dichloromethane (50:1), then add 50mg of a commercially available mixed-phase titanium dioxide catalyst, and irradiate it with ultraviolet light for 4 hours in the air, and the dissolution rate of platinum is 81.6%. .

[0028] figure 1 , 2 Divided into sample diagrams before and after the dissolution reaction, from figure 1 It can be seen that the sample is gray-black before dissolution; figure 2 It can be seen that the sample turns white after the dissolution reaction; image 3 It can also be clearly seen from the ICP test data in the liquid that the proportion of platinum in the liquid is continuously increasing (take a small amount of solution to evaporate the solvent and add water with the same amount of solvent to dilute it for detection).

Embodiment 2

[0030] Disperse 500mg of a material containing 1% platinum into a mixed solution of 100ml of acetonitrile and dichloromethane (50:1), then add 50mg of a commercially available mixed-phase titanium dioxide catalyst, and irradiate it with ultraviolet light for 4 hours in the air. The dissolution rate of platinum is 91.4%. .

Embodiment 3

[0032] Disperse 500 mg of a material containing 1% platinum into a mixed solution of 200 ml of acetonitrile and dichloromethane (50:1), then add 50 mg of a commercially available mixed-phase titanium dioxide catalyst, and irradiate with ultraviolet light in air for 4 hours, and the dissolution rate of platinum is 100%. .

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Abstract

The invention relates to a photocatalytic metal dissolution method. The method comprises the steps that a metal-containing material to be dissolved is dispersed into a mixed solution of a cyanide compound and organic chloride, then photocatalyst is added, oxygen-containing gas is introduced or a substance capable of generating oxygen is added, and metal can be dissolved through light irradiation for a certain period of time. Compared with the prior art, the method has the advantages of being mild in process, energy-saving, green, environmentally-friendly, low in costs and convenient to operate, and is suitable for large-scale industrialized metal dissolution treatment.

Description

technical field [0001] The invention belongs to the field of photocatalytic application, in particular to a photocatalytic metal dissolving method. Background technique [0002] Metals exist widely in nature and are widely used in daily life. They are very important and most widely used substances in modern industry. In addition to their environmental impact, metal mining and smelting consumes 7 to 8 percent of the world's energy supply. Recycling consumes less energy than primary production of metals while reducing the overall impact on the land where the mineral is mined. However, affected by the process and recycling costs, the metal recovery rate is still maintained at a low level. In particular, the dissolution of precious metals usually needs to be treated with aqua regia. These methods are harmful to the environment, the recovery cost is very high, and the pollution is serious. Therefore, there is an urgent need for green methods in the metal refining and recycling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/16
CPCC22B11/04C22B3/16Y02P10/20C22B3/1608B01J35/004B01J27/051B01J21/063B01J27/04B01J35/00B01J23/06B01J27/14B01J27/045B01J31/003B01J31/0244B01J31/0252B01J2531/26B01J2531/025
Inventor 卞振锋陈瑶徐梦娇凌丽丽闻洁雅万瑜刘丽李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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