A kind of liquid cathode and its application

A liquid cathode and electrode technology, applied in the field of water treatment, can solve problems such as incomplete treatment of heavy metals, and achieve the effects of high-value utilization, large adsorption capacity, and enhanced electrode activity.

Active Publication Date: 2021-12-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that it is difficult to effectively remove heavy metals in industrial wastewater and the treatment of heavy metals in polluted wastewater is not thorough, the present invention provides a liquid cathode with simple operation, large adsorption capacity of adsorption materials, low operating voltage, and high efficiency; the liquid cathode consists of Composed of hydrophobic functionalized ionic liquid, conductive electrode, and hydrophilic PVC immobilized film, the hydrophobic functionalized ionic liquid is used as the electrode body, the hydrophilic PVC film is used as the immobilized film, and the conductive electrode is used as the electrified medium; the hydrophobic function The ionic liquid is filled in a bag made of hydrophilic PVC solid film, and then the conductive electrode is placed in it to make a liquid cathode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At room temperature, take 5 mol / L 4-picoline solution, drop 0.1 mol / L 4-chlorobutyronitrile under nitrogen atmosphere, this process is accompanied by a large amount of heat generation, after the solution is cooled to room temperature, it is evaporated by rotary evaporation The solvent was removed, the solid product was washed with acetyl ethyl ester and filtered, and the acetyl ethyl ester was removed by rotary evaporation again, and the solid product was placed under vacuum for 12 hours to obtain 1-butyronitrile-4-picoline chloride, and 3 g of 1-butane Nitrile-4-picoline chloride and 5 g of potassium bis(trioxymethylsulfonyl)imide were mixed in a beaker containing 100 mL of water for 24 hours, and the acetonitrile was removed by rotary evaporation and filtered with dichloromethane and After washing with water, the product was placed under vacuum for 24 h to obtain 1-butyronitrile-4-methylpyridinium bis(trifluoromethyl)sulfonimide functionalized ionic liquid ([4MPYRCN][T...

Embodiment 2

[0024] Take 50mL trihexyl(tetradecyl)phosphonium 2(methylthio)methyl benzoate functionalized ionic liquid ([PR 4 ][MTBA]) was placed in a bag made of hydrophilic PVC solid film, and a metal Cu electrode was built in to make a liquid cathode; where [PR4 ][MTBA] Reference "Fischer L , Falta T , Koellensperger G , et al. Ionic liquids for extraction of metals and metal containing compounds from communal and industrial waste water[J]. Water Research, 2011, 45(15):0-4614 .” Preparation and synthesis, the preparation method of the hydrophilic PVC immobilized membrane is the same as in Example 1, its contact angle is 5 degrees, the pore diameter is 20 μm, and the membrane thickness is 0.12 mm.

[0025] In the case of no external power supply, first place the liquid cathode in the 2+ Concentration 200mg / L, Hg 2+ Concentration 150mg / L, Sn 4+ In 1000mL of mining wastewater with a concentration of 80mg / L and a pH of 7.5, it was adsorbed at room temperature for 25 hours, and the Cd in t...

Embodiment 3

[0027] Take 50mL of 1-methyl-1-[4,5-bis(methylsulfide)]pentylpyrrolidine bis(trifluoromethyl)sulfonimide functionalized ionic liquid ([MPYRROS 2 ][Tf 2 N]) placed in a bag made of hydrophilic PVC immobilized film, with a built-in metal Fe electrode to make a liquid cathode; where [MPYRROS 2 ][Tf 2 N] Refer to the literature "Papaiconomou N, Lee J M, Salminen J, et al. Selective Extraction of Copper, Mercury, Silver, and Palladium Ions from Water Using Hydrophobic Ionic Liquids. [J]. Industrial & Engineering Chemistry research, 2007, 47(15):5080 -5086." Preparation and synthesis, the preparation method of the hydrophilic PVC immobilized film is the same as in Example 1, its contact angle is 10 degrees, the pore diameter is 5-10 µm, and the film thickness is 0.16 mm.

[0028] When the liquid cathode is used, first put the liquid cathode in the 2+ The concentration is 300mg / L, Hg 2+ In electroplating wastewater with a concentration of 200 mg / L and a pH of 5, the liquid cathod...

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PUM

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Abstract

The invention discloses a liquid cathode, which is composed of a hydrophobic functionalized ionic liquid, a conductive electrode and a hydrophilic PVC solid support film. The hydrophobic functionalized ionic liquid is filled in a bag made of the hydrophilic PVC solid support film Then, the conductive electrode is placed in it to make a liquid cathode; the electrode preparation method is simple, the electrode specific surface area is large, the capacitance is large, and the physical adsorption, chemical adsorption, and electrosorption are organically coupled, which is not only suitable for high-concentration heavy metal wastewater. It is also suitable for the advanced treatment of several ppm low-concentration heavy metal ion wastewater in water; it solves the problems of low current density, inability to efficiently transfer mass, low electrolysis efficiency and high power consumption when conventional electrodes electrolyze low-concentration heavy metal wastewater.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a liquid cathode and its application. Background technique [0002] With the rapid development of global industrialization, the discharge of wastewater containing heavy metal ions is also increasing day by day. Their discharge leads to water cycle pollution, water quality deterioration, insufficient drinking water supply and complicated drinking water pretreatment. Water heavy metal pollution has become a threat to human beings. major environmental issues for development. [0003] The traditional methods for removing heavy metal ions from wastewater include: adsorption method, membrane separation method, chemical precipitation method, air flotation method, flocculation sedimentation method, ion exchange method, etc. These traditional methods are expensive to deal with heavy metals and are likely to cause secondary pollution . At present, the electrolysis method has been...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/469C02F101/20
CPCC02F1/46109C02F1/469C02F2101/20C02F2201/46105C02F2001/46133
Inventor 瞿广飞杨聪庆李军燕李恒宁平
Owner KUNMING UNIV OF SCI & TECH
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