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Method for photocatalytic dissolution of metal by using phosphate radical modified photocatalyst

A photocatalyst and phosphate radical technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, and improvement of process efficiency. Catalyst activity etc.

Active Publication Date: 2021-09-10
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is convenient for large-scale dissolution of metals, but oxygen activation is the key rate-determining step in the metal dissolution reaction. Traditional photocatalysts have a certain effect on the activation of oxygen, but photocatalytic technology is limited in actual production and application. Due to the rapid recombination of electron-holes and the low utilization rate of visible light
[0004] At present, researchers at home and abroad have enhanced the visible light absorption of photocatalysts and improved the efficiency of photocatalytic oxygen activation by changing the morphology and size of nanostructures, noble metal deposition, heterojunction semiconductor recombination, and non-metallic doping. When metal photocatalysts are used, the effect is not good
The deposition of noble metals in the reaction system will affect the dissolution percentage of noble metals; the compound synthesis process of heterojunction semiconductors is complicated, and hydrothermal synthesis is often used, which consumes energy at high temperatures; non-metallic doping usually introduces defects, and too many defects are easy to As a recombination center for photogenerated electrons and holes, it affects the activity of the catalyst

Method used

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  • Method for photocatalytic dissolution of metal by using phosphate radical modified photocatalyst
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  • Method for photocatalytic dissolution of metal by using phosphate radical modified photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for photocatalytically dissolving metals using a phosphate-modified photocatalyst, comprising the following steps:

[0038] (1) Preparation of inorganic phosphate-modified photocatalysts

[0039] Take 0.1g K 3 PO 4 Add it into 100mL deionized aqueous solution, stir at room temperature for 1h, add 0.1g of titanium dioxide during stirring, and continue stirring at 90°C for 20h. After centrifugal separation and drying, the phosphate-modified photocatalyst was obtained. attached figure 1is the SEM image of the obtained phosphate-modified titanium dioxide, as can be seen from the element distribution diagram, uniform stirring for a certain period of time makes the phosphate evenly distributed on the surface of the titanium dioxide photocatalyst, and obtains an inorganic phosphate-modified photocatalyst, its structural formula as follows.

[0040]

[0041] (2) Dissolved metal

[0042] Disperse 0.1 g of the metal-containing material to be dissolved (Au ore cr...

Embodiment 2

[0050] A method for photocatalytically dissolving metals using a phosphate-modified photocatalyst, comprising the following steps:

[0051] (1) Preparation of inorganic phosphate-modified photocatalysts

[0052] Take 1g, 2g, 3g, 4g, 5g K respectively 3 PO 4 Add 100 mL of deionized water solution, stir at room temperature for 1 h, add 0.1 g of titanium dioxide during stirring, and continue stirring at 90° C. for 20 h. After centrifugal separation and drying, the phosphate-modified photocatalyst was obtained. attached figure 1 It is the EDS mapping diagram of the obtained phosphate-modified titanium dioxide. It can be seen from the element distribution diagram that the phosphate is evenly distributed on the surface of the titanium dioxide photocatalyst, and the mass percentages of the phosphate are 1%, 2%, and 3%, 4%, 5% photocatalyst.

[0053] The object of photocatalytic dissolution of metal is silver, that is, extract the metal Ag in the Ag ore, crush the Ag ore to 10-20...

Embodiment 3

[0059] Repeat the operation steps of Example 2, the difference is that the object of photocatalytic dissolution of metal is platinum, that is, the metal Pt in the Pt ore is extracted, and the Pt ore is pulverized to 10-20nm, the results are shown in Table 3 below

[0060] The dissolution rate and dissolution rate of Pt were detected by inductively coupled plasma spectrometer (ICP).

[0061] The results obtained are shown in Table 3 below:

[0062]

[0063] It can be seen from the above table that the rate of photocatalytic dissolution of platinum can be significantly improved with the increase of the modification amount of phosphate.

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Abstract

The invention relates to a method for photocatalytic dissolution of metal by using a phosphate radical modified photocatalyst. The method comprises the following steps that a metal-containing material to be dissolved is dispersed into a mixed solution containing a nitrile compound and an organic chloride, an inorganic phosphate radical modified photocatalyst is added, oxygen is introduced or a substance capable of generating oxygen is added, metal is dissolved under the condition of light irradiation, and after the metal is dissolved, a metal organic coordination compound is formed in the solution and has the general formula of (NH4) xMCly. Compared with the prior art, the preparation process of the photocatalyst is simple and convenient, after inorganic phosphate modification, oxygen adsorption can be improved, more superoxide free radicals are generated, visible light absorption of the catalyst can be improved so as to enhance the reaction rate of photocatalytic dissolution of metal, a feasible scheme is provided for actual production development, and the method has extremely high application value in the aspects of waste metal dissolution and recovery, photocatalytic oxidation reaction and the like.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a method for photocatalytically dissolving metals by modifying photocatalysts with phosphate radicals. 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 impact on the environment, metal mining and smelting use up 7% to 8% 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 ne...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/44C22B11/00B01J27/18B01J27/16
CPCC22B7/006C22B3/44C22B11/04C22B11/042B01J27/1806B01J27/16B01J35/39Y02P10/20
Inventor 卞振锋乔倩瑜
Owner SHANGHAI NORMAL UNIVERSITY
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