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Suaeda-salsa-base porous carbon and application thereof

A technology of Suaeda salsa and porous carbon, applied in inorganic chemistry, water/sludge/sewage treatment, water/sewage treatment, etc., can solve problems that have not yet been reported, achieve important social significance and strong industrial operability , the effect of uniform distribution

Inactive Publication Date: 2017-05-10
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Suaeda salsa is an annual herbaceous salt-accumulating plant, which is one of the herbaceous plants with the highest salt content in the world. There have been reports on the production and development of plant salt using Suaeda salsa, but at present, the use of Suaeda salsa carbonization to prepare porous Carbon materials have not yet been reported

Method used

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  • Suaeda-salsa-base porous carbon and application thereof
  • Suaeda-salsa-base porous carbon and application thereof
  • Suaeda-salsa-base porous carbon and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A kind of Suaeda salsa base porous carbon, it is prepared by following method:

[0035] (1) In early December 2015, the mature Suaeda salsa was collected, washed with water, dried naturally until the water content was 10%, and crushed to 150 mesh. It was determined that the sodium content in the Suaeda salsa plant was 2.67 mg / g, and the potassium content was 3.24 mg / g.

[0036] (2) Weigh 20g of Suaeda salsa powder and place it in a tube furnace, under the protection of nitrogen, raise the temperature to 700°C at a rate of 12°C / min, and keep the constant temperature for 180min.

[0037] (3) Naturally cool to room temperature under the condition of nitrogen gas flow, and wash with 500 mL of 60°C mixed acid (containing 10% hydrochloric acid and 7% hydrofluoric acid) by shaking for three times, each time for 30 minutes. After filtering, wash with hot deionized water until the pH value is 7.0 (no chlorine ion is detected), and dry to obtain the Suaeda salsa-based porous car...

Embodiment 2

[0040] Capacitive deionization applications of Suaeda-based porous carbons in saline. Mix the Suaeda-based porous carbon material prepared in the above-mentioned Example 1 with acetylene black and polytetrafluoroethylene at a mass ratio of 8:1:1, add it to the ethanol dispersant, and disperse it ultrasonically until it is evenly distributed. Spread evenly on the graphite plate, and dry overnight at 105°C to form a porous carbon electrode. Then take two porous carbon electrodes of the same quality, separate them with plastic nets of the same size, connect the two ends of the electrodes with a DC power supply, and inject the solution to be deionized into a single capacitor. In 0.5mol / L sodium chloride, calcium chloride and ferric chloride solution, the specific capacitance of Suaeda-based porous carbon in saline land is 88F / g, 94F / g and 112F / g respectively. In a 1mol / L sodium chloride solution, under the test voltage range of -0.5 to 0.5V, the constant current charge and discha...

Embodiment 3

[0043] A kind of Suaeda salsa base porous carbon, it is prepared by following method:

[0044] (1) In the first ten days of December 2015, the mature Suaeda salsa was collected, washed with water, dried naturally until the water content was 11%, and crushed to 200 mesh. It was determined that the sodium content in the Suaeda salsa plant was 2.69 mg / g, and the potassium content was 3.26 mg / g.

[0045] (2) Weigh 20g of Suaeda salsa powder and place it in a tube furnace. Under the protection of nitrogen, the heating rate is raised to 800°C at a rate of 15°C / min, and the temperature is kept at a constant temperature for 240min.

[0046] (3) Naturally cool to room temperature under the condition of nitrogen gas flow, and wash with 500 mL of 70°C mixed acid (containing 12% hydrochloric acid and 8% hydrofluoric acid) by shaking for three times, each time for 30 minutes. After filtering, wash with hot deionized water until the pH value is 7.0 (no chlorine ion is detected), and dry to...

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Abstract

The invention discloses a Suaeda-salsa-base porous carbon and application thereof. The preparation method of the Suaeda-salsa-base porous carbon comprises the following steps: collecting mature-stage Suaeda salsa, cleaning with clear water, naturally airing until the moisture content is lower than 12-15%, and pulverizing to 150-200 meshes; in an inert gas protective atmosphere, heating activation temperature, and keeping the temperature constant for 120-240 minutes; and after cooling, sufficiently removing impurities by using hot mixed acid, cleaning with deionized water until the pH value is 7.0, and drying to obtain the Suaeda-salsa-base porous carbon. The salt impurities are removed from the carbonized high-salt-content plant to leave abundant pores, thereby implementing regulation on the pore size and distribution. The prepared Suaeda-salsa-base porous carbon material with abundant pore structures and uniform distribution has excellent properties when being used as an electrode active material in capacitor deionization. The Suaeda-salsa-base porous carbon has abundant raw material sources, and has important social meanings, economic value and environmental protection benefits.

Description

technical field [0001] The invention relates to the technical field of high-value utilization of halophytes and the preparation and application of biochar-based electrode materials, in particular to a Suaeda-based porous carbon and its application. Background technique [0002] Due to the characteristics of low energy consumption, high desalination efficiency and no secondary pollution, capacitive deionization technology is a seawater and brackish water desalination technology with good development prospects. The basic technical idea of ​​capacitive deionization is to apply a certain voltage on both sides of the electrode, and an electric double layer with a thickness of 1-10nm is formed on the surface of the electrode. It will move in the direction opposite to the polarity of the electrode and be adsorbed by the electric double layer. [0003] The key to affect the performance of capacitive deionization is the choice of electrode material. The selection of electrode mater...

Claims

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Application Information

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IPC IPC(8): C01B32/318C02F1/469
CPCC02F1/4691C01P2004/03C01P2006/12C01P2006/16C01P2006/40
Inventor 严金龙全桂香王慧
Owner YANCHENG INST OF TECH
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