A reducing ion exchange membrane for treating waste water containing precious/heavy metals and recovering high-purity metal elements, and its method and application

A technology of ion exchange membrane and metal element, which is applied in the field of heavy metal treatment, can solve the problems of unrecoverable metal element recovery, difficulty in metal element recovery, limited capacity of adsorption method, etc., and achieve effective removal/recovery of metal, high metal removal/recovery Efficiency, Ease of Scale Production

Active Publication Date: 2021-11-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical precipitation method needs to consume a large amount of chemical reagents, the operation cost is high, the removal efficiency is low, and the product is sludge containing heavy metal ions, which reduces the value of the metal (such as gold, silver, palladium, platinum and other precious metals); the operation period of the ion exchange method is long And it can only treat low-concentration heavy metal wastewater; the electrochemical method is limited by the diffusion current density, and the cost of low-concentration heavy metal wastewater treatment is high; the capacity of the adsorption method is limited, and the amount of wastewater that can be treated is low
Recently, some researchers have used direct current (DC) / alternating current (AC) electrochemical methods to deal with high and low concentrations of heavy metal pollution. This method requires a large amount of electrical energy input, and it is difficult to avoid side reactions of hydrogen and oxygen production on the electrode surface. , and it is difficult to realize the recovery of simple metal
There are also researchers who use a new ion exchange method to treat heavy metal wastewater by switching the composite membrane composed of layered zirconium phosphate (a-ZrP) nanosheets and conductive polyaniline (PANI) intercalation chains. Heavy metals can be absorbed from the aqueous solution to the membrane, and the regeneration of the membrane is completed by switching the potential again to release metal ions. However, the inventors found that this method only achieves the treatment and concentration of metal ions, and does not achieve the recovery of simple metals. Effect

Method used

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  • A reducing ion exchange membrane for treating waste water containing precious/heavy metals and recovering high-purity metal elements, and its method and application
  • A reducing ion exchange membrane for treating waste water containing precious/heavy metals and recovering high-purity metal elements, and its method and application
  • A reducing ion exchange membrane for treating waste water containing precious/heavy metals and recovering high-purity metal elements, and its method and application

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Experimental program
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Effect test

Embodiment 1

[0066] A reductive ion exchange technology for treating precious / heavy metal wastewater and recovering high-purity metal elements, comprising the following steps:

[0067] (1) With 0.6mol / L CH 3 COONa solution was used as electrolyte, reducing ion exchange membrane was used as working electrode, RuO 2 / IrO 2 The coated Ti mesh electrode was used as the counter electrode, the Ag / AgCl electrode was used as the reference electrode, and -10mA / cm was applied to the working electrode 2 The current is charged with sodium;

[0068] (2) Immerse the reducing ion exchange membrane filled with sodium into 0.1mol / L AgNO 3 Let it stand in the solution for 1 minute, then take it out with tweezers;

[0069] (3) again in CH 3 COONa solution was filled with sodium, then immersed in 0.1mol / L AgNO 3 Stand still in the solution for 1 minute, and circulate like this 10 times, and finally blow dry with nitrogen to obtain a reducing ion exchange membrane with simple Ag attached to the surface. ...

Embodiment 2

[0083] Step is the same as embodiment 1, and difference is the AgNO in step (2) and (3) 3 The solution was changed to Cu(NO 3 ) 2 solution.

[0084] Figure 6 It is the SEM photo of the surface of the reducing ion exchange membrane after reducing Cu, and the granular Cu element can be observed.

[0085] Figure 7 It is the XRD spectrum of the reducing ion exchange membrane after reducing Cu. The diffraction peak shape is sharp and there are no other impurity peaks. It matches the standard card of Cu, confirming that the surface of the membrane is reduced to Cu simple substance.

[0086] Figure 8 It is the element distribution on the surface of the reducing ion exchange membrane after reducing Cu, and the contrast between the granular Cu element and the membrane background is obvious.

Embodiment 3

[0088] Step is the same as embodiment 1, and difference is the AgNO in step (2) and (3) 3 The solution was changed to Pb(NO 3 ) 2 solution.

[0089] Figure 9 It is the SEM photograph of the surface of the reducing ion exchange membrane after Pb is reduced, and block-shaped Pb element can be observed.

[0090] Figure 10 It is the XRD spectrum of the reducing ion exchange membrane after reducing Pb. The diffraction peak shape is sharp and there are no other miscellaneous peaks, which matches the standard card of Pb, confirming that the surface of the membrane is reduced to Pb elemental substance.

[0091] Figure 11 is the element distribution on the surface of the reducing ion exchange membrane after reducing Pb, and the Pb element is uniformly distributed on the block particles, indicating that the block particles are the reduced Pb element.

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Abstract

The invention belongs to the field of heavy metal treatment, and relates to a reducing ion exchange membrane for treating waste water containing precious / heavy metals and recovering high-purity metal elements and its method and application. The technology uses sodium fast ion conductor type NaTi 2 (PO 4 ) 3 The prepared membrane is used as a reducing ion exchange membrane material. First, sodium is filled in a solution containing sodium ions to make it into a high reduction state, and then it is placed in wastewater containing metal ions so that noble / heavy metal ions are exchanged in reducing ion exchange. The surface of the membrane is reduced to simple metal, and the reduced metal can be easily recovered. The device is simple, the reduction process does not require the participation of the counter electrode, the device design has high flexibility, does not need to consume a large amount of chemical reagents, and uses clean electric energy to reduce metal ions. It has high selectivity for noble / heavy metal ions, and can It is very convenient to recover precious metals in a single state. The prepared reducing ion-exchange membrane material can still maintain good sodium storage performance after 50 cycles, and has excellent recycling performance.

Description

technical field [0001] The invention belongs to the field of heavy metal treatment, and in particular relates to a reductive ion exchange technology for treating precious / heavy metal wastewater and recovering high-purity metal elements. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the rapid growth of the world's population and the continuous expansion of industrial and agricultural activities, the available water resources are gradually decreasing, and the problems of water pollution and scarcity of fresh water resources are becoming more and more serious. At present, about 1.2 billion people in the world suffer from water shortage and water resource security issu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J39/12C02F1/42C22B7/00C22B11/00C22B13/00C22B15/00
CPCB01J39/12C02F1/42C02F2001/425C22B7/006C22B11/042C22B13/045C22B15/0063Y02P10/20
Inventor 王挺董顺
Owner SHANDONG UNIV
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