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Method for electrochemical removal of heavy metals in liquid

A heavy metal, electrochemical technology, applied in chemical instruments and methods, electrochemical sludge treatment, separation methods, etc., to achieve the effects of environmental friendliness, easy operation and fast speed

Active Publication Date: 2017-01-04
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology of removing metal ions based on the principle of capacitor is mostly used in Na + , Mg 2+ , Ca 2+ and other salt ions, while the removal of heavy metals has not been reported

Method used

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  • Method for electrochemical removal of heavy metals in liquid
  • Method for electrochemical removal of heavy metals in liquid
  • Method for electrochemical removal of heavy metals in liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for electrochemically removing heavy metal ions in liquid, comprising the steps of:

[0026] 1) Mix carbon nanotube-modified birnessite, acetylene black, and polyvinylidene fluoride at a mass ratio of 75:15:10, disperse with ultrasound for 30 minutes to make a slurry, coat it on carbon paper, and dry it in vacuum at 75°C Make working electrode;

[0027] 2) Place the above working electrode in the 2+ Using blank carbon paper as the counter electrode and a saturated calomel electrode as the reference electrode to form a three-electrode system, a supercapacitor is made;

[0028] 3) Perform constant current charge and discharge on the supercapacitor (current density is 0.1A / g, potential window relative to the reference electrode is 0-0.9V, cycle number is 50 times). Detection of Pb in the solution after charging and discharging 2+ content, to calculate the removal amount.

[0029] Wherein the birnessite modified by carbon nanotubes is made by the following meth...

Embodiment 2

[0032] A method for electrochemically removing liquid heavy metal ions, comprising the following steps:

[0033] 1) Mix birnessite, acetylene black, and polytetrafluoroethylene in a mass ratio of 80:10:10, ultrasonically 15 minutes to make a slurry, coat it on carbon paper, and vacuum-dry at 80°C to make a working electrode;

[0034] 2) Place the above working electrode in a Zn-containing 2+ Using blank carbon paper as the counter electrode and a saturated calomel electrode as the reference electrode to form a three-electrode system, a supercapacitor is made;

[0035] 3) Charge and discharge the supercapacitor with a constant current (the current density is 5A / g, the potential window relative to the reference electrode is -0.6-1.0V, and the number of cycles is 50). Detection of Zn in the solution after charging and discharging 2+ content, to calculate the removal amount.

[0036] From figure 2 It can be seen that Zn in solution 2+ When the content is 350mg / L, the unit ma...

Embodiment 3

[0038] A method for electrochemically removing liquid heavy metal ions, comprising the following steps:

[0039] 1) Mix carbon nanotube-modified birnessite, Super P, and polyvinyl alcohol at a mass ratio of 70:10:20, ultrasonicate for 15 minutes to make a slurry, coat it on carbon paper, and dry it in vacuum at 60°C. Working electrode;

[0040] 2) Place the above working electrode in a Cd-containing 2+ Using blank carbon paper as the counter electrode and a saturated calomel electrode as the reference electrode to form a three-electrode system, a supercapacitor is made;

[0041] 3) Charge and discharge the supercapacitor with a constant current (the current density is 2A / g, the potential window relative to the reference electrode is 0-1.0V, and the number of cycles is 40). Detection of Cd in the solution after charging and discharging 2+ content, to calculate the removal amount.

[0042] From image 3 It can be seen that the Cd in the solution 2+ When the content is 200mg / ...

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Abstract

The invention discloses a method for electrochemical removal of heavy metals in liquid. The method comprises a step 1) of mixing an electrode active material, conductive agent and binder according to a mass ratio of 50-100:10-30:5-20, performing ultrasound treatment for 5-60 min to prepare a sizing agent, coating carbon paper with the sizing agent, and performing vacuum drying at 60-90 DEG C to prepare a working electrode; a step 2) of placing the working electrode in the liquid containing the heavy metals, forming a three-electrode system by taking the blank carbon paper as a counter electrode and taking a saturated calomel electrode as a reference electrode, or utilizing the working electrode and the blank carbon paper counter electrode to form a two-electrode system, and manufacturing a supercapacitor; and a step 3) of charging and discharging the supercapacitor. According to the method, the various heavy metals in the liquid can be removed efficiently, and the method has the advantages of being high in removal capacity, quick in speed, low in cost, simple and convenient to operate and environmentally friendly and the like.

Description

technical field [0001] The invention relates to a method for removing heavy metal ions in liquid, in particular to a method for electrochemically removing heavy metal ions in liquid by utilizing the principle of a supercapacitor. Background technique [0002] As one of the main pollutants in water and soil, heavy metals originate from mineral mining, metallurgy, paint use, nuclear and other industrial production, etc. (Chem.Soc.Rev., 2013, 42, 3792-3807). At present, the main methods for removing heavy metals in water include chemical precipitation, ion exchange, membrane filtration, adsorption, and electrodialysis. Heavy metals in soil are mainly fixed chemically. However, most of these methods are limited in application due to high cost, complexity and low adsorption capacity. [0003] Supercapacitor is an energy storage device between traditional capacitors and batteries. It has attracted much attention due to its high power density, short charging time and long cycle l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F1/467C02F1/461C02F11/00
CPCC02F1/46109C02F1/4672C02F1/4676C02F1/4691C02F11/006C02F2001/46138C02F2101/20C02F2101/203C02F2101/22C02F2201/46C02F2201/46105
Inventor 邱国红刘立虎彭启川谭文峰刘凡
Owner HUAZHONG AGRI UNIV