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Method for preparing activated carbon by using betel nuts and sludge as materials

A technology for preparing activated carbon and sludge, applied in the field of activated carbon, can solve the problems of poor performance, low yield and insufficient adsorption capacity, and achieve the effects of reducing energy consumption, high yield and strong iodine adsorption capacity.

Active Publication Date: 2021-12-07
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthetic activated carbon prepared from the existing sludge has poor performance, insufficient adsorption capacity, and low yield

Method used

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  • Method for preparing activated carbon by using betel nuts and sludge as materials
  • Method for preparing activated carbon by using betel nuts and sludge as materials
  • Method for preparing activated carbon by using betel nuts and sludge as materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 betel nut sludge activated carbon preparation

[0038] 1.1 Experimental equipment and chemicals

[0039] ZnCl 2 、H 3 PO 4 , sodium thiosulfate, iodine, potassium iodide, hydrochloric acid and other reagents are all chemically pure; activated sludge, betel nut (local direct sampling).

[0040] Electric blast drying oven, tube furnace, crucible, electronic precision balance, nitrogen cylinder, glass instrument, etc.

[0041] 1.2 Preparation of activated carbon

[0042] S1. Raw material preparation: wash the whole betel nut fruit with water to remove surface dirt, mix and dry the betel nut and sludge according to the mass ratio of 1:1 until the moisture content is 10%-20%, and the drying temperature is 105°C ±5°C; crush the dried product and pass through a 100-200 mesh sieve to obtain mixed particles of betel nut and sludge;

[0043]S2. High-temperature carbonization process: place the mixed particles of betel nut and sludge obtained in step S1 in a tube...

Embodiment 2

[0059] Embodiment 2-activation temperature research

[0060] The activation process mainly includes the contact between the activator and the carbonized product and the change process of the pore structure after carbonization. Activation temperature is a key factor in the preparation of high-performance activated carbon. On the basis of Example 1, the activation temperature is adjusted to be 400°C, 500°C, 600°C, 700°C, 800°C, and 900°C respectively, and the iodine value and productive rate under different activation temperatures are as follows: image 3 shown.

[0061] Such as image 3 As shown, the iodine value increases rapidly with the activation temperature from 400 °C to 800 °C, but when the temperature exceeds 800 °C, the iodine value decreases. This may be due to the increased diffusion of activated molecules into the interior of the carbonized product at higher temperatures; thus, more carbons undergo activation reactions with phosphoric acid and hydrogen chloride, ...

Embodiment 3

[0062] Example 3 - Activation Time Study

[0063] On the basis of Example 1, the activation time was adjusted to be 30-120 minutes respectively.

[0064] Such as Figure 4 As shown, the iodine value of AC increased sharply from 545.69 mg / g to 634.72 mg / g before 60 minutes, and then decreased from 634.72 mg / g to 493.99 mg / g. A better iodine value of 634.72 mg / g was exhibited with a yield of 51% as the carbonized precursor was obtained at 600°C for 60 minutes. The reason may be that the shorter the activation time, the incomplete activation, and the lower the adsorption capacity; the highly developed pore structure needs enough time to stimulate micropore corrosion to meet the adsorption demand; and the prolonged activation time has a negative impact on the formation of pores, It even causes adjacent micropores to expand into pores. With the activation time ranging from 30 min to 120 min, a continuous decrease in yield could be observed, which may be due to further decomposit...

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Abstract

The invention provides a method for preparing activated carbon by using betel nuts and sludge as materials, which comprises the following steps: S1, raw material preparation: mixing betel nuts and sludge, and conducting drying, crushing and sieving to obtain betel nut and sludge mixed particles; S2, high-temperature carbonization: putting the mixed raw material into a tubular furnace, and performing carbonization initial treatment in a nitrogen atmosphere; S3, activator soaking: mixing the carbonized betel nuts and sludge mixed particles with an activating agent aqueous solution prepared from phosphoric acid, zinc chloride and water, and conducting soaking after even stirring, so as to obtain a mixed product; S4, high-temperature activation: putting the mixed product into a tubular furnace, conducting activating in a nitrogen atmosphere, and conducting cooling to obtain a crude product; and S5, obtaining of a finished product: carrying out acid pickling, water washing and drying on the crude product to obtain a target activated carbon product. The prepared betel nut sludge activated carbon has the advantages of abundant pore structures, large specific surface area, high iodine adsorption capacity, high yield and the like. The method has the characteristics of low energy consumption and simplicity in operation.

Description

technical field [0001] The invention relates to the field of activated carbon, in particular to a method for preparing activated carbon by using betel nuts and sludge as materials. Background technique [0002] With the rapid development of urban sewage plants, a large amount of sludge is produced. Sewage sludge is a by-product of sewage treatment. About 50% of the weight of sewage sludge is organic matter, most of which are hemicellulose, cellulose, lignin, lipids and proteins, which can be utilized as resources. [0003] Lignocellulosic materials (such as coconut shells, corn stalks, sawdust, plant stalks, and betel nuts, etc.) as activated carbon materials containing a large amount of organic matter and rich in carbon can be prepared simply by pyrolysis process with large specific surface area, stable physical and chemical properties and Activated carbon with excellent adsorption capacity. In addition, these cellulose-rich materials have the advantages of abundant sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/348C01B32/324
CPCC01B32/342C01B32/348C01B32/324
Inventor 衣雪松林德鑫陈俣良杨飞王旭
Owner HAINAN UNIVERSITY
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