Method for electrically adsorbing metal ions through porous carbon material prepared from PVC waste plastic

A metal ion, electro-adsorption technology, applied in separation methods, chemical instruments and methods, carbon preparation/purification, etc., can solve the problem of less metal ion treatment, and achieve the effects of low cost, simple operation and high safety

Inactive Publication Date: 2019-03-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There have been reports on the use of electrodes containing porous carbon materials for seawater desalination, but there are few reports on metal ion treatment.
In particular, porous nitrogen-sulfur double-doped carbon materials prepared from waste plastics have not been reported for the adsorption of heavy metal ions in water.

Method used

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  • Method for electrically adsorbing metal ions through porous carbon material prepared from PVC waste plastic
  • Method for electrically adsorbing metal ions through porous carbon material prepared from PVC waste plastic
  • Method for electrically adsorbing metal ions through porous carbon material prepared from PVC waste plastic

Examples

Experimental program
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Effect test

Embodiment 1

[0043] a. Put 1.0g of shredded waste PVC file bags into 10.0mL of dimethylformamide solution, heat and stir at 60°C for 20min. The above solution was transferred to a ball mill jar, and then 2.0 g of potassium hydroxide and 1.0 g of thiourea were added to the black slurry obtained by ball milling at room temperature for 4 hours, and dried in an oven at 60° C. to obtain a precursor of a nitrogen-sulfur double-doped porous carbon material. The precursor prepared in Example 1 was roasted at 600°C for 2 hours in a tube furnace under the protection of an inert gas at a rate of 5-10°C / min; Dry in an oven at 80°C to obtain a porous carbon material doped with nitrogen and sulfur.

[0044] b. A variety of metal chloride aqueous solutions are respectively configured to simulate industrial wastewater. The concentration of each metal ion is 40mg / L or 1mg / L (pH=6.5-6.8). 13 microSiemens / cm;

[0045] c. Mix the porous doped carbon material, acetylene black, and binder at a ratio of 80:15:...

Embodiment 2

[0048] Synthesize a nitrogen-sulfur double-doped porous carbon material according to the method of Example 1, but configure a mixed aqueous solution of three kinds of metal chlorides (magnesium, nickel, lead) to carry out electrosorption treatment (pH=6.8), and the concentration of each metal ion is respectively 20mg / L, the conductivity of the above simulated wastewater was measured to be ~250 microsiemens / cm; a voltage of 1.4V was applied for electrosorption, the flow rate of the solution was 25ml / min, and desorption was achieved by applying a reverse voltage of 1.4V; electrosorption and desorption During the process, take 1ml of the treated mixed solution from the beaker every 1 hour to the plasma emission spectrometer (ICP) for quantitative analysis of the metal element content, and obtain the concentration changes of various metal ions in the mixed solution during the adsorption and desorption process . Depend on Figure 13 and 14 It can be seen that magnesium ions still...

Embodiment 3

[0050] Except that thiourea becomes dimethyl sulfoxide, other is the same as embodiment 1.

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Abstract

The invention relates to a method for electrically adsorbing metal ions through a porous carbon material prepared from PVC waste plastic and belongs to the technical fields of the treatment and conversion of waste plastic and the electro-adsorption water treatment. The method comprises the following steps: (1) swelling the waste PVC plastic in a strong polar solvent, adding inorganic strong alkaliand a doping source, grinding at the room temperature for a certain period of time, so as to obtain a porous doped carbon material; (2) carrying out high-temperature roasting on a precursor, washingwith water to remove inorganic salt, and carrying out centrifugation, drying and the like, so as to obtain doped porous carbon which is applied to ionic adsorption and is prepared based on the PVC waste plastic; and (3) preparing an electrically adsorbed electrode material from the prepared porous doped carbon material, and processing metal ions by virtue of the electrode material, wherein the adsorption volume of each metal ion is more than 50mg/g. The invention provides a simple, clean and environment-friendly treatment method for the waste PVC plastic, and the treatment of the metal ions isrealized by virtue of an electro-adsorption technique.

Description

technical field [0001] The invention belongs to the technical field of waste plastics treatment, transformation and electro-adsorption water treatment, and in particular relates to a method for the treatment and transformation of PVC waste plastics and the treatment of metal ions by electro-adsorption technology. Background technique [0002] The rapid development of China's PVC plastic industry in recent years has accelerated the pace of research and development, promotion and application of PVC plastics, and its production and sales scale ranks first in the world. According to reports, my country's polyvinyl chloride output reached 23.48 million tons per year in 2015, and PVC plastics have been widely used in various fields of our lives. The consumption of PVC is mainly divided into two parts. One is soft products, which mainly include wires and cables, films for various purposes, flooring materials, fabric coatings, artificial leather, various hoses, gloves, toys, plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C01B32/05C02F101/10C02F101/20
CPCC01B32/05C02F1/469C02F2101/10C02F2101/20C02F2101/203
Inventor 常铮张茸茸常营娜张国新孙晓明
Owner BEIJING UNIV OF CHEM TECH
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