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Method for electrodepositing palladium from ionic liquid

An ionic liquid and electrodeposition technology, applied in the field of environmentally friendly electrochemical technology and high efficiency, can solve the problems of long electrodeposition time, increased energy consumption and high cost, and achieve the effects of simple operation process, avoiding energy consumption and low equipment cost.

Inactive Publication Date: 2014-05-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the bistrifluoromethanesulfonimide (TFSI-) anionic ionic liquid used in the experiment can not only exist stably, but also is immiscible with water, but its cost is relatively high, and the electrodeposition time is also long (42h) to increase energy consume

Method used

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  • Method for electrodepositing palladium from ionic liquid
  • Method for electrodepositing palladium from ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 0.05mol of 1-ethyl-3-methylimidazolium trifluoroacetate (EMIMCF3 COO) ionic liquid.

[0035] (2) to EMIMCF 3 Add 0.2gPdCl to COO 2 , under constant temperature magnetic stirring for 30min at 25°C, the PdCl 2 To reach a supersaturated state, the purpose is to avoid the continuous consumption of Pd during the constant current electrodeposition process. 2+ , such that Pd 2+ It cannot diffuse around the cathode in time, resulting in an increase in the degree of concentration polarization while maintaining a constant current.

[0036] (3) Perform cyclic voltammetry curve test on the mixed system to obtain the reduction peak of palladium ions, which corresponds to the current of palladium ions reduced to elemental palladium, and the calculated current density is 0.02mA / mm 2 .

[0037] (4) Calculate the current of the electrodeposition process according to the current density in (3) and the surface area of ​​the cathode used in the electrodeposition, and conduct...

Embodiment 2

[0041] (1) Weigh 0.05mol 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMIMCF 3 SO 3 ) ionic liquids.

[0042] (2) to EMIMCF 3 SO 3 Add 0.2gPdCl to 2 , under constant temperature magnetic stirring for 30min at 35°C, the PdCl 2 To reach a supersaturated state, the purpose is to avoid the continuous consumption of Pd during the constant current electrodeposition process. 2+ , such that Pd 2+ It cannot diffuse around the cathode in time, resulting in an increase in the degree of concentration polarization while maintaining a constant current.

[0043] (3) Perform cyclic voltammetry curve test on the mixed system to obtain the reduction peak of palladium ions, which corresponds to the current of palladium ions reduced to elemental palladium, and the calculated current density is 0.016mA / mm 2 .

[0044] (4) Calculate the current of the electrodeposition process according to the current density in (3) and the surface area of ​​the cathode used in the electrodepositi...

Embodiment 3

[0048] (1) Weigh 0.05mol 1-ethyl-3-methylimidazolium hexafluorophosphate (EMIMPF 6 ) ionic liquids.

[0049] (2) Heating up to 70°C, at this time EMIMPF 6 has completely melted into a liquid state, then add 0.2g of PdCl to it 2 , under constant temperature magnetic stirring at 70°C for 1h, the PdCl 2 To reach a supersaturated state, the purpose is to avoid the continuous consumption of Pd during the constant current electrodeposition process. 2+ , such that Pd 2+ It cannot diffuse around the cathode in time, resulting in an increase in the degree of concentration polarization while maintaining a constant current.

[0050] (3) Perform cyclic voltammetry curve test on the mixed system to obtain the reduction peak of palladium ions, which corresponds to the current of palladium ions reduced to elemental palladium, and the calculated current density is 0.03mA / mm 2 .

[0051] (4) Calculate the current of the electrodeposition process according to the current density in (3) an...

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Abstract

The invention relates to a method for electrodepositing palladium from an ionic liquid. The method is characterized in that an ionic liquid containing PdCl2 is utilized as an electrolyte, and a palladium element is directly obtained on a cathode in a constant current electrodeposition mode at a low temperature (25-70DEG C). The cation of the ionic liquid used in the invention is a 1,3-dialkyl substituted imidazole ionic liquid, and concretely is a 1-ethyl-3-methylimidazolium cation [EMIm]<+> having a low viscosity and a good conductivity at normal temperature, and the anion of the ionic liquid is trifluoroacetate (CF3COO<->), trifluoromethanesulfonate (CF3SO3<->), dicyanamide (DCA<->), ethylsulfate (C2H5SO4<->) and hexafluorophosphate (PF6<->). The cation is combined with one or more anions to form a substance, and the substance can be used as a PdCl2 solvent and an electrolyte. The method has the advantages of simple operation and low apparatus cost, and the electrolytic medium ionic liquid has the advantages of wide electrochemical window, good thermal stability, wide difference between a solidifying point and a boiling point and the like, so environment pollution caused by the inflammableness and the volatility of a common organic solvent is avoided.

Description

technical field [0001] The invention relates to a method for electrodepositing palladium from ionic liquids, which utilizes imidazole-based non-aluminum chloride ionic liquids substituted by ethyl groups with low viscosity and good conductivity at normal temperature as solvent and electrolyte, which is an efficient and environmentally friendly method. electrochemical technology. Background technique [0002] Palladium is a precious metal with silver-white metallic luster, excellent corrosion resistance, ductility, wear resistance, high temperature resistance, high catalytic activity and extremely high economic value. At present, it has been widely used in the fields of automobile, jewelry processing, industry and investment. [0003] Traditional electrolysis systems include aqueous solution systems and high-temperature molten salts, but the electrochemical window of aqueous solutions is relatively narrow, and the hydrogen evolution side reaction is serious, resulting in hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/52
Inventor 席晓丽聂祚仁宋姗姗孙晓凯马立文张力文
Owner BEIJING UNIV OF TECH
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