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Method for preparing porous carbon for wastewater treatment

A technology for wastewater treatment and porous carbon, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as complex processes, and achieve the effect of simple process and cost reduction.

Inactive Publication Date: 2013-01-16
ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to impregnate the porous carbon with hydrogen peroxide, which requires secondary carbonization and secondary activation, and the process is complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Soak blue charcoal (particle size: 5-18 mm) in a mixed solution of 0.1 mol / L citric acid and ferric nitrate for 20 minutes, and the drying temperature of the product is 90°C. Pour into the activation furnace after drying, under N 2 The temperature was raised under the atmosphere, the heating rate was 6°C / min, the activation temperature was 750°C, and the activation time was 60 minutes. When the activation temperature was reached, the nitrogen valve was closed and high-pressure steam was introduced. After activation, vibrate and wash in HCl solution with pH=5 for 30 minutes. The temperature of hydrochloric acid solution is 60°C, boil and wash with tap water until pH=7, and then dry to obtain porous carbon. After testing, the strength of the porous carbon is 93%, the iodine adsorption value is 458 mg / g, the methylene blue adsorbate is 235 mg / g, and the COD removal rate is 91%.

Embodiment 2

[0016] Immerse blue carbon (particle size: 5-18 mm) in a mixed solution of 0.8 mol / L oxalic acid and cobalt nitrate for 30 minutes, and the drying temperature of the product is 90°C. Pour into the activation furnace after drying, under N 2 The temperature is raised under the atmosphere, the heating rate is 8°C / min, the activation temperature is 800°C, and the activation time is 180min. When the activation temperature is reached, the nitrogen valve is closed and high-pressure water vapor is introduced. HNO at pH=3 after activation 3 Shake and wash in the solution for 40 minutes, use hydrochloric acid solution at a temperature of 90° C., boil and wash with tap water until the pH is about 7, and dry to obtain porous carbon. After testing, the strength of the porous carbon is 92%, the iodine adsorption value is 489mg / g, the methylene blue adsorption substance is 318mg / g, and the COD removal rate is 96%.

Embodiment 3

[0018] Immerse blue carbon (particle size: 5-18 mm) in a mixed solution of 1.2 mol / L oxalic acid and cobalt nitrate for 30 minutes, and the drying temperature of the product is 90°C. Pour into the activation furnace after drying, under N 2 The temperature was raised under the atmosphere, the heating rate was 10°C / min, the activation temperature was 850°C, and the activation time was 120min. When the activation temperature was reached, the nitrogen valve was closed and high-pressure steam was introduced. After activation, vibrate and wash in HCl solution with pH=2 for 60min. The temperature of hydrochloric acid solution is 90°C, boil and wash with tap water until pH=7, and then dry to obtain porous carbon. After testing, the strength of the porous carbon is 90%, the iodine adsorption value is 412mg / g, the methylene blue adsorbate is 288mg / g, and the COD removal rate is 92%.

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Abstract

The invention relates to a method for preparing porous carbon for wastewater treatment. The method comprises the following steps: (1) pretreating semi coke with the grain size of 5 to 18 mm and soaking in a mixed solution of organic matters and inorganic salts at certain concentration; (2) directly activating products which are dried and dehydrated at the temperature of between 750 and 850 DEG C for 60 to 180 minutes; and (3) performing acid treatment on the activated products, washing and drying to obtain the porous carbon. According to the scheme, the semi coke directly serves as a raw material and one-step activating treatment is adopted without the steps of crushing, deashing, kneading, forming, carbonizing and the like, so the process is simple, the cost is low, and the prepared porous carbon has abundant micropore-mesopore-macropore structures, can adsorb various metal ions and organic matters in sanitary wastewater and industrial wastewater and is widely applied.

Description

technical field [0001] The invention relates to a preparation method of porous carbon, specifically a kind of porous carbon prepared by using blue carbon as a raw material, which is mainly used for treating industrial waste water. Background technique [0002] Porous carbon material refers to a new type of carbon material with different pore structures, and its pore size ranges from micropores (<2nm) capable of adsorbing metal ions to mesopores (2-50nm) and macropores (>50nm) capable of adsorbing organic molecules. ). [0003] Patent CN 102500319 discloses a method for increasing the mesoporosity of porous carbon. The porous carbon prepared by the method has a good removal effect on organic matter in sewage, and is helpful for the industrial application of the porous carbon in water quality. However, this method needs to impregnate the porous carbon with hydrogen peroxide, which requires secondary carbonization and secondary activation, and the process is complicated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/10C01B32/336
Inventor 王耀光刘小峰刘雪松石磊
Owner ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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