A kind of expanded graphite electrode for the electrochemical removal of heavy metal ions in wastewater and its preparation method and application

A technology of heavy metal ions and expanded graphite, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of lack of active sites on the electrode surface, small specific surface area, poor metal ion reduction performance, etc., to achieve The preparation method is convenient, the material is simple, and the effect of low price

Active Publication Date: 2021-04-06
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area of ​​these graphite electrode forms is small, and the electrode surface lacks active sites, and the reduction performance for metal ions is poor.

Method used

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  • A kind of expanded graphite electrode for the electrochemical removal of heavy metal ions in wastewater and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Preparation of expanded graphite electrode for treatment of electroplating wastewater containing hexavalent chromium

[0023] Electroplating wastewater contains 187mg / L of hexavalent chromium, COD=50mg / L, pH=3.5. The reactor is a typical double-chamber electrolytic cell. The reactor is composed of two rectangular reaction chambers with a volume of 220ml. The length, width and height are respectively: 5cm; 4cm; 11cm. The effective volume used in the experiment is 200ml. The outer wall of the reactor is made of plexiglass. The area between the two reaction chambers is 45cm 2 The proton exchange membrane is physically separated. The two reaction chambers are connected by flanges. In order to prevent leakage, rubber rings are used to seal the flanges and the proton exchange membranes. The opening above the anode chamber is sealed with a rubber plug, and 3 openings are reserved on the rubber plug for wires, sampling ports, etc. After the reactor is built, the ...

Embodiment 2

[0026] Example 2 Preparation of Expanded Graphite Electrode for Copper-containing Wastewater Treatment

[0027] The waste water contains 78mg / L of copper ions, COD=20mg / L, pH=6.3. The reaction device is a typical double-chamber electrolytic cell. The reactor is composed of two rectangular reaction chambers with a volume of 220ml. The length, width and height are respectively: 5cm; 4cm; 11cm. The effective volume used in the experiment is 200ml. The outer wall of the reactor is made of plexiglass. The area between the two reaction chambers is 45cm 2 The proton exchange membrane is physically separated. The two reaction chambers are connected by flanges. In order to prevent leakage, rubber rings are used to seal the flanges and the proton exchange membranes. The opening above the anode chamber is sealed with a rubber plug, and 3 openings are reserved on the rubber plug for wires, sampling ports, etc. After the reactor is built, the gap is sealed with high-density sealant. ...

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Abstract

The invention discloses an expanded graphite electrode used for electrochemical removal of heavy metal ions in waste water, a preparation method and application thereof. First, the graphite paper was cut to a suitable size, ultrasonically cleaned in acid, alkali and ultrapure water for one hour each, and then dried. Then, soak the pretreated graphite paper in liquid nitrogen for 5-30min, and then quickly immerse the frozen graphite paper into the ethanol solution. At room temperature, liquid nitrogen molecules vaporize rapidly, and instantly expand in the graphite paper sheet to expand the graphite paper into three-dimensional expanded graphite. Furthermore, the expanded graphite was calcined at 700° C. for 1 h, and ultrasonicated in ethanol for 30 minutes. Finally, it is used as an electrode after being rinsed with a large amount of ultrapure water and dried. The obtained three-dimensional expanded graphite electrode has good conductivity, and heavy metal ions in wastewater can be efficiently removed by electrochemical reduction.

Description

technical field [0001] The invention relates to the fields of water treatment and material development, in particular to the field of removing and recovering metal ions in wastewater containing heavy metal ions. Background technique [0002] Chemical industry, metallurgy, tanning and other industries produce a large amount of wastewater containing heavy metals. It contains a large amount of metal elements such as chromium, copper, nickel, etc., which will cause serious harm to the water environment, soil and human health. Therefore, national, local, and industry emission standards have put forward very high requirements for the limits of heavy metals. How to efficiently treat heavy metal wastewater has become an urgent technical problem. The existing heavy metal treatment methods include: chemical precipitation method, membrane separation method, biological method and so on. However, the above-mentioned methods have their own shortcomings, such as poor treatment effect, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/467C02F101/20
CPCC02F1/46109C02F1/4676C02F2001/46138C02F2001/46152C02F2101/20
Inventor 李中坚姚佳妮黄颖杨彬侯阳雷乐成
Owner ZHEJIANG UNIV
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