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Preparation method for integral polyacrylonitrile carbon fiber electrode for desalination

A technology of polyacrylonitrile and polyacrylonitrile membrane, which is applied in separation methods, electrochemical water/sewage treatment, and separation of dispersed particles. It can solve the problems of lengthy process and difficult large-scale preparation of carbon materials, and achieve high desalination capacity. , the fiber diameter is thin, and the effect of mass ratio capacitance is large

Inactive Publication Date: 2012-11-14
DALIAN UNIV OF TECH
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Problems solved by technology

However, the preparation of mesoporous carbon by the template method requires the preparation of silicon or polymer templates first. The process is lengthy and it is difficult to apply to the large-scale preparation of carbon materials.

Method used

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  • Preparation method for integral polyacrylonitrile carbon fiber electrode for desalination
  • Preparation method for integral polyacrylonitrile carbon fiber electrode for desalination
  • Preparation method for integral polyacrylonitrile carbon fiber electrode for desalination

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Embodiment Construction

[0025] The present invention will be further illustrated by examples below

[0026] In this example, the polyacrylonitrile fiber membrane was prepared by the electrospinning process ( figure 1 ), and then investigate the properties of carbon fiber under different activation temperatures (750, 800, 900°C). The specific properties are shown in Table 1. It can be seen from Table 1 that the specific surface area increases with the activation temperature; when the activation temperature is 900℃, the specific surface area is 712m 2 / g. In addition, the average pore diameter of carbon fiber is above 2nm, so it is rich in mesopores, which is advantageous for the adsorption of salt, because the mesopores are more conducive to the electrosorption of hydrated sodium ions and hydrated chloride ions.

[0027] Table 1 Hole performance characteristics of monolithic active PAN-based carbon fiber

[0028]

[0029] figure 2 When the activation temperature is 900℃, PAN-based activated carbon fiber. ...

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Abstract

The invention relates to a preparation method for an integral polyacrylonitrile carbon fiber electrode for desalination, belonging to the technical field of novel carbon material preparation and water treatment. The method is based on an electrostatic spinning technique. Polyacrylonitrile is electro-spun into a film and then preoxidation, carbonization and activation are conducted. The prepared carbon fiber material has the characteristics of good macro integrity, small fiber diameter, large mass specific capacitance, high desalination capacity and the like. When electro-adsorption treatment is conducted to NaCl solution with initial concentration being 70mg / l under 1.6V direct-current voltage, the adsorption capacity of the carbon fiber electrode reaches 4.64mgNaCl / g and therefore a strong desalination capacity is reflected. The novel carbon fiber electrode can be widely used in fields such as bitter saline water and seawater desalination, water softening, heavy metal ion removal andthe like.

Description

Technical field [0001] The invention relates to a method for preparing a monolithic polyacrylonitrile carbon fiber electrode for desalination, and belongs to the technical field of preparation of new carbon materials and water treatment. Background technique [0002] Capacitive Deionization Technology (CDT) is a brand-new electrosorption desalination method based on the principle of electric double-layer capacitors for charging desalination and discharge regeneration. Since only direct current (0.5~2V) is needed in the desalination process, and the electrode can be regenerated by short-circuiting or reverse connection, it does not need to use a large amount of acid and alkali to clean the electrode, so no secondary pollutants will be generated , It has the characteristics of energy saving, environmental protection, high efficiency and simple operation. [0003] In capacitive deionization desalination technology, the electrode material mainly uses carbon materials that meet the req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/46C02F1/469
Inventor 邱介山王刚潘超钱冰清
Owner DALIAN UNIV OF TECH
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