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Comprehensive recycling method of solid polymer electrolyte water-electrolysis membrane electrode

A solid polymer, electrolyzed water technology, used in recycling technology, fuel cell disposal/recycling, battery recycling, etc., can solve the problems of environmental pollution, reagent pollution, cumbersome process, etc. The effect of simple process flow

Inactive Publication Date: 2020-01-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (3) The extraction of precious metals in the prior art requires multiple purifications of the leaching solution, which is cumbersome, time-consuming, and pollutes the environment
[0012] For the time-consuming, high cost, and certain pollution of the reagents, the existing technology is difficult to solve

Method used

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  • Comprehensive recycling method of solid polymer electrolyte water-electrolysis membrane electrode
  • Comprehensive recycling method of solid polymer electrolyte water-electrolysis membrane electrode
  • Comprehensive recycling method of solid polymer electrolyte water-electrolysis membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061] Soak the disassembled SPE electrolytic water membrane electrode in acetone for 2 hours, ultrasonic for 30 minutes, wait until the catalyst on the cathode and anode completely falls off the Nafion membrane, and obtain the filter residue by centrifugation. Wash the filter residue with water and ethanol, and dry the washed filter residue in a blast oven for standby use, the drying temperature is 60° C., and the drying time is 3 hours.

[0062] Add the dried filter residue to 6mol L -1 In the hydrochloric acid solution, the molar mass of hydrochloric acid is 8 times that of the filter residue. After fully reacting for 1 hour, the unreacted filter residue and the filtrate are centrifuged and separated. The filter residue produced in this step is also washed with deionized water and absolute ethanol. Dried in an air oven for subsequent use, the same drying temperature was 60°C, and the drying time was 3 hours.

[0063] Slowly add sodium hydroxide solution dropwise in the fil...

example 2

[0067] Soak the disassembled SPE water electrolysis membrane electrode in acetone for 1.5 hours, ultrasonic for 45 minutes, wait until the catalyst on the cathode and anode completely falls off the Nafion membrane, obtain the filter residue by centrifugation, use deionized water and anhydrous Wash the filter residue with water and ethanol, and dry the washed filter residue in a blast oven for standby use, the drying temperature is 70° C., and the drying time is 2.5 hours.

[0068] Add the dried filter residue to 5mol L -1 In the hydrochloric acid solution, the molar mass of hydrochloric acid is 10 times that of the filter residue. After fully reacting for 1 hour, the unreacted filter residue and the filtrate are centrifuged and separated. The filter residue produced in this step is also washed with deionized water and absolute ethanol. Dried in an air oven for subsequent use, the same drying temperature was 70°C, and the drying time was 2.5 hours.

[0069] Slowly add sodium h...

example 3

[0073] Soak the disassembled SPE electrolytic water membrane electrode in acetone for 1 hour, and ultrasonicate for 60 minutes. After the catalyst on the cathode and anode completely falls off from the Nafion membrane, obtain the filter residue by centrifugation, and use deionized water and anhydrous Wash the filter residue with water and ethanol, and dry the washed filter residue in a blast oven for standby use, the drying temperature is 80° C., and the drying time is 2 hours.

[0074] Add the dried filter residue to 4mol L -1 In the hydrochloric acid solution, the molar mass of hydrochloric acid is 12 times that of the filter residue. After fully reacting for 1 hour, the unreacted filter residue and the filtrate are centrifuged. The filter residue produced in this step is also washed with deionized water and absolute ethanol, and then the Dried in an air oven for subsequent use, the drying temperature was also 80° C., and the drying time was 2 hours.

[0075] Slowly add sod...

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Abstract

The invention belongs to the technical field of comprehensive recycling of SPE water-electrolysis membrane electrodes, and discloses a comprehensive recycling method of a solid polymer electrolyte water-electrolysis membrane electrode. The SPE water-electrolysis membrane electrode is soaked and subjected to ultrasound treatment and flushing to separate a catalyst from a perfluor ion exchange membrane; obtained filter residues are dried and added into a plenty of a hydrochloric acid solution, and after the reaction is thorough, the obtained filter residues and a filtrate are subjected to centrifugal separation; a sodium hydroxide solution is added into the obtained filtrate to obtain blue powder; the blue powder is heated to obtain a black solid; the black solid is added into aqua regia, and then centrifugal separation is conducted; an obtained filtrate is added into hydrazine hydrate to obtain metal platinum; the perfluor ion exchange membrane which is separated out is soaked and subjected to heat treatment, and obtained carbon and a catalyst are combined with the filter residues. The comprehensive recycling method has the advantages that the technological process is simple, the cost is low, the pollution is small, and the recovery rate is high and reaches 99% or above; the pressure that precious metal resources are scarce is greatly relieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recycling of SPE electrolytic water membrane electrodes, and in particular relates to a comprehensive recycling method of solid polymer electrolyte electrolytic water membrane electrodes. It specifically relates to the comprehensive recovery and utilization of platinum, iridium dioxide and perfluorinated ion exchange membranes in electrolyzed water, and is also suitable for the recovery and utilization of platinum in fuel cells. Background technique [0002] Currently, the closest prior art: [0003] Solid polymer electrolyte (SPE) water electrolysis hydrogen production technology has the advantages of high efficiency, zero emission, environmental friendliness, safety and reliability, and has been widely used in industrial hydrogen and oxygen production. At the same time, high-purity hydrogen and oxygen produced by electrolysis of water are also widely used in energy, medical treatment, ana...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00H01M8/008
CPCC22B7/007C22B11/046H01M8/008Y02P10/20Y02W30/84
Inventor 赵宏滨陈哲赵康宁叶代新方建慧
Owner SHANGHAI UNIV
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