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Self-supporting porous carbon fiber material as well as preparation method and application thereof

A porous carbon fiber, self-supporting technology, applied in separation methods, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problems of small specific surface area of ​​capacitive deionization electrodes, limited heavy metal ion adsorption capacity, low electric double layer capacitance, etc. , to achieve the effect of excellent cycle life, high capacitance capacity and good mechanical properties

Pending Publication Date: 2021-12-10
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, significant challenges remain in the development of capacitive deionization electrodes
There are two main reasons. One is that the specific surface area of ​​the capacitive deionization electrode is small, resulting in a low electric double layer capacitance, which severely limits its ability to adsorb heavy metal ions.
The second is that most capacitive deionization electrode materials have poor mechanical properties and need to be attached to the current collector, which also limits their ability to adsorb heavy metal ions

Method used

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  • Self-supporting porous carbon fiber material as well as preparation method and application thereof
  • Self-supporting porous carbon fiber material as well as preparation method and application thereof
  • Self-supporting porous carbon fiber material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1, preparation of nascent nanofibrous membrane: 1.0 g of polyacrylonitrile (PAN) and 0.3 g of polyvinylpyrrolidone (PVP) were sequentially added to 10 mL of N,N-dimethylformamide (DMF), and then heated at 60 °C Stir vigorously until PAN and PVP are completely dissolved to obtain a mixed solution. Then add 1.0 g of SnCl to the mixed solution 2 Stir at room temperature for 24 h to obtain a precursor solution. Electrospin the precursor solution with a roller device, specifically: transfer the precursor solution to a syringe with a stainless steel needle, connect the needle to a high-voltage power supply, push the material at a rate of 0.04ml / h, and apply 18 to the tip of the stainless steel needle. A constant voltage of kilovolts was used, and the distance between the stainless steel needle tip and the collector was fixed at 15 cm. The humidity of the electrospinning chamber was controlled at 75%, and the temperature was controlled at 25±5° C., and the nascent nanof...

Embodiment 2

[0058] Step 1, preparation of nascent nanofibrous membrane: 0.9 g of polyacrylonitrile (PAN) and 0.4 g of polyvinylpyrrolidone (PVP) were sequentially added to 11 mL of N,N-dimethylformamide (DMF), and then heated at 60 °C Stir vigorously until PAN and PVP are completely dissolved to obtain a mixed solution. Then add 0.9g SnCl to the mixed solution 2 Stir at room temperature for 24 h to obtain a precursor solution. Electrospin the precursor solution with a roller device, specifically: transfer the precursor solution to a syringe with a stainless steel needle, connect the needle to a high-voltage power supply, push the material at a rate of 0.045ml / h, and apply 21 to the tip of the stainless steel needle. A constant voltage of kilovolts was used, and the distance between the stainless steel needle tip and the collector was fixed at 17 cm. The humidity of the electrospinning chamber was controlled at 70%, and the temperature was controlled at 25±5° C., and the nascent nanofibe...

Embodiment 3

[0063] Step 1, preparation of nascent nanofibrous membrane: 0.8 g of polyacrylonitrile (PAN) and 0.2 g of polyvinylpyrrolidone (PVP) were sequentially added to 9 mL of N,N-dimethylformamide (DMF), and then heated at 60 °C Stir vigorously until PAN and PVP are completely dissolved to obtain a mixed solution. Then add 0.8g SnCl to the mixed solution 2 Stir at room temperature for 24 h to obtain a precursor solution. Electrospin the precursor solution with a roller device, specifically: transfer the precursor solution to a syringe with a stainless steel needle, connect the needle to a high-voltage power supply, push the material at a rate of 0.035ml / h, and apply 20 to the tip of the stainless steel needle. A constant voltage of kilovolts was used, and the distance between the stainless steel needle tip and the collector was fixed at 18 cm. The humidity of the electrospinning chamber was controlled at 65%, and the temperature was controlled at 25±5° C., and the nascent nanofiber...

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Abstract

The invention discloses a self-supporting porous carbon fiber material as well as a preparation method and application thereof, and belongs to the technical field of capacitive deionization. The preparation method of the self-supporting porous carbon fiber material comprises the following steps of: step 1, adding SnCl2 into a mixed solution of polyacrylonitrile, polyvinylpyrrolidone and an organic solvent to obtain a precursor solution, and performing electrostatic spinning on the precursor solution to obtain a primary nanofiber membrane; 2, sequentially performingpre-oxidation, carbonization and reduction treatment on the primary nanofiber membrane, so as to obtain a porous Sn-carbon nanofiber composite material; 3, performing acid treatment on the porous Sn-carbon nanofiber composite material in an acid solution, so as to obtain the self-supporting porous carbon fiber material. The self-supporting porous carbon fiber material prepared by the method of the invention has the advantages of great specific surface area, good mechanical property and flexibility, high capacitance capacity, long cycle service life and excellent conductivity.

Description

technical field [0001] The invention relates to the technical field of capacitive deionization, in particular to a self-supporting porous carbon fiber material and its preparation method and application. Background technique [0002] With the development of industry, water pollution, especially the pollution of heavy metal ions (mainly chromium, vanadium, copper, cobalt, cadmium, mercury, arsenic, lead, etc.), has become more and more serious and has become a global environmental problem. The accumulation and biosorption of heavy metal ions in aquatic systems and organisms will accumulate through the food chain, causing more serious safety hazards to humans. Removal and recovery of heavy metals from wastewater is one of the main concerns of water treatment technology. More stringent emission standards for heavy metal ions force people to continuously search for efficient and economical treatment methods for removing metal ions. So far, many methods for removing heavy metal...

Claims

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Application Information

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IPC IPC(8): C02F1/469D01F9/22D01F1/10C02F101/20
CPCC02F1/4691D01F9/22D01F1/10C02F2101/20
Inventor 李勇李雨果高萌谷倩倩张兴双王猛
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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