Photocatalytic selective metal dissolving agent and dissolving method

A photocatalyst and selective technology, applied in the field of photocatalysis, can solve the problems of complicated preparation steps of carbon tube composite films, and achieve the effects of low cost, convenient operation and low toxicity

Active Publication Date: 2021-03-26
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation steps of its carbon tube composite film are cumbersome, and

Method used

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  • Photocatalytic selective metal dissolving agent and dissolving method
  • Photocatalytic selective metal dissolving agent and dissolving method
  • Photocatalytic selective metal dissolving agent and dissolving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Disperse 500mg of materials containing the same amount of copper, silver, and gold into 50ml of acrylonitrile solution, then add 50mg of commercially available mixed-phase titanium dioxide catalyst, irradiate with ultraviolet light in air for 4 hours, the metal dissolution rate is 100%, and the dissolution order is copper, silver ,gold.

[0030] figure 1 It is the dissolution ratio curve diagram of the three metal selective dissolution reactions. From the ICP test data, it can be clearly seen that the metal dissolution sequence in the liquid is copper, silver, gold, and the proportion of the three metals is increasing continuously (take a small amount of solution and evaporate the solvent Add an equal amount of solvent to dilute with water for detection).

Embodiment 2

[0032] Disperse 500mg of materials containing equivalent amounts of aluminum, iron, cobalt, nickel, zinc, palladium, platinum, ruthenium, rhodium, and iridium into 500ml of acrylonitrile solution, then add 50mg of commercial mixed-phase titanium dioxide catalyst, and irradiate with ultraviolet light for 4h in the air , the metal dissolution rate is 0%.

[0033] figure 2 It is the dissolution ratio curve diagram of the selective dissolution reaction of various metals. From the ICP test data, it can also be clearly seen that there is no metal dissolution in the liquid (take a small amount of solution to evaporate the solvent and add water with an equal amount of solvent to dilute it for detection), which shows that The method is exceptionally selective for the metals copper, silver and gold.

Embodiment 3

[0035] Disperse 50mg of materials containing 1% copper, 1% silver and 1% gold into 20ml acrylonitrile solution, then add 50mg commercial mixed-phase titanium dioxide catalyst, irradiate with ultraviolet light in air for 4h, the dissolution rate of metal is 100%.

[0036] From image 3 It can be seen that the samples were purple (gold), red (silver) and green (copper) before dissolution, and all the samples turned white after the dissolution reaction.

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Abstract

The invention relates to a photocatalytic selective metal dissolving agent and a dissolving method. The photocatalytic selective metal dissolving agent is a cyanide compound solution containing a photocatalyst, the water content in the cyanide compound solution is 0-50 wt%, and the content of the photocatalyst in the cyanide compound solution is 0.01-50 mg/mL. The photocatalytic selective metal dissolving method comprises the following steps that a metal material is dispersed into the photocatalytic selective metal dissolving agent, and selectively dissolving is carried out on each metal in the metal material after light irradiation for a certain period of time. Compared with the prior art, existing understanding of a precious metal selective dissolution process is broken through, and thephotocatalytic selective metal dissolving agent and the dissolving method have guiding significance for evolution of metal in the environment and metal exploitation or metal separation and purification treatment.

Description

technical field [0001] The invention relates to the application field of photocatalysis, in particular to a photocatalytic selective metal dissolving agent and a dissolving method. Background technique [0002] With the rapid development of science and technology, the utilization rate of metals is getting higher and higher, and the combination of most metals can play a greater role. However, the metal content is limited, and it is very important to recover and reuse the metal. Among them, the selective dissolution of metals is one of the most important processes in recovery. In existing methods, metals are mostly dissolved with strong acid (aqua regia) to recover precious metals. The metal ion solution obtained by this method is non-selective, and the entire The process is harmful to the environment, the cost of recycling is very high, and the pollution is serious. [0003] Patent CN108728645A discloses a process method for acid dissolution and activation of ferroalloys co...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCC22B7/009C22B7/007C22B11/048C22B15/0067Y02P10/20
Inventor 卞振锋陈瑶徐梦娇闻洁雅万瑜李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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