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Method for preparing powder active carbon by taking cow dung as raw material

A technology of powdered activated carbon and activated carbon, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of crop yield decline, ecological environment hazards, surface water pollution, etc., and achieve low environmental pollution, low cost, The effect of solving the pollution problem

Inactive Publication Date: 2014-08-27
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the above-mentioned substances have a certain long-term accumulation of environmental pollution. When they accumulate in the environment to a certain extent, they will cause soil degradation, crop yield decline, and pollute surface water and groundwater through runoff and leaching. Great harm to the ecological environment

Method used

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  • Method for preparing powder active carbon by taking cow dung as raw material
  • Method for preparing powder active carbon by taking cow dung as raw material
  • Method for preparing powder active carbon by taking cow dung as raw material

Examples

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Effect test

Embodiment 4

[0031] Among other activated carbons described in Example 4, other activated carbons are commercial activated carbons and cow dung activated carbons obtained under the optimal process of phosphoric acid method found in public searches. The measured data were all completed under the same conditions.

[0032] The chromium solution that is adsorbed in the example of the present invention is the potassium dichromate solution that the chromium content concentration is 100mg / L, and the dye solution that is adsorbed is the reactive brilliant blue solution that concentration is 300mg / L.

[0033] Adsorption conditions in the examples of the present invention: the dosage is 6g / L, the pH is 6, and the temperature is room temperature 25°C.

[0034] In the following examples, the composite activators are all composed of phosphoric acid and potassium dihydrogen phosphate in a mass ratio of 20:1.

Embodiment 1

[0036] Select 0.5 kg of cow dung as raw material, dry it and sieve it to 0.9 mm, put it in a container and mix and impregnate it with a composite activator, wherein the impregnation ratio of cow dung and composite activator is 1:9, after 24 After one hour of immersion, the container was transferred to a muffle furnace, anaerobically carbonized at a temperature of 700 ° C for 1 h, then washed with distilled water at room temperature and dried at 105 ° C, then ground and sieved to 200 mesh , so as to obtain a cow dung activated carbon with a yield of 56%. Its iodine value was measured to be 775.97 mg / g, and the methylene blue adsorption value was 127 mg / g. The removal rate of chromium solution is 95.67%, and the decolorization rate of dye is 94.30%.

Embodiment 2

[0038] Select 0.5 kg of cow dung as raw material, dry it and sieve it to 0.9 mm, put it into a container and mix and impregnate it with a composite activator, wherein the impregnation ratio of cow dung and composite activator is 1:10, after 24 After one hour of immersion, the container was transferred to a muffle furnace, anaerobically carbonized at 600°C for 1.5 h, then washed with distilled water at room temperature to neutral, then dried at 105°C, and then ground and sieved to 200 mesh, thereby The cow dung activated carbon with a yield of 50% was obtained. Its iodine value was measured to be 792.48 mg / g, and the methylene blue adsorption value was 136.25 mg / g. The removal rate of chromium solution is 98.53%, and the decolorization rate of dye is 98.15%.

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Abstract

The invention discloses a method for preparing powder active carbon by taking cow dung as a raw material. The method is as follows: by taking the cow dung as the raw material, carrying out activation for 24 hours by a composite activator formed by mixing phosphoric acid and phosphate, and then carbonizing at a high temperature. According to the invention, livestock breeding waste-cow dung is mainly utilized as the raw material, and is sufficient in source, easy to purchase and low in price; the composite activator is relatively low in price and can be recycled in different degrees; the method for using the activator to activate the cow dung and then carbonizing radically solves influences and damage of the cow dung on environment; the prepared active carbon can be directly and practically applied to satisfy various needs on active carbon, so that waste is changed into things of value, and therefore, the method has remarkable social and economic benefits, and very good commercial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of activated carbon, and in particular relates to a method for processing cow dung by adopting a composite activation method and preparing it into activated carbon. Background technique [0002] With the rapid development of animal husbandry, the pollution of animal excrement to the environment is becoming more and more serious, especially the elements such as nitrogen, phosphorus, iron, zinc and copper in the excrement are particularly serious for environmental pollution. Moreover, the above-mentioned substances have a certain long-term accumulation of environmental pollution. When they accumulate to a certain extent in the environment, they will cause soil degradation, crop yield decline, and pollute surface water and groundwater through runoff and leaching. Great harm to the ecological environment. Among them, cow dung is one of the main excrements. A cow excretes about 20 kg of feces a day, and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/324C01B32/342
Inventor 沈泽文曹奥运刘廷凤陈文栋陈亚南甘瑜威
Owner NANJING INST OF TECH
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