Preparation method of KOH-microwave activated corncob activated carbon for treating cationic dye-containing wastewater

A cationic dye and microwave activation technology is applied in the field of preparation of KOH-microwave activated corncob activated carbon, which can solve the problems that the adsorption performance of cations and organic pollutants needs to be improved, and achieve the effects of shortening preparation time, simple preparation process and low cost.

Pending Publication Date: 2021-02-26
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the adsorption performance of existing activated carbon materials for cations and organic pollutants needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of KOH-microwave activated corncob activated carbon for treating cationic dye wastewater, the steps are as follows:

[0026] (1) Wash the corn cob with distilled water. Then, it is dried in a constant temperature blast drying oven. Next, take the dried corncobs and crush them with a pulverizer and pass them through a 50-mesh sieve, spread the sieved corncob powder evenly in a vacuum drying oven, and dry them at 60°C for 24 hours to remove the moisture of the raw materials . Finally, the dried corncob powder is collected and placed in a desiccator for future use.

[0027] (2) Add 5 g of corncob powder into 100 mL of KOH solution with a mass fraction of 10 wt %, stir and mix evenly.

[0028] (3) The mixture obtained in step (2) was placed in a 250mL round-bottomed flask, and after adding a magnet, it was refluxed in a constant temperature water bath at 80°C for 5h. After the reflux was completed, the mixture was placed in a vacuum drying oven and ...

Embodiment 2

[0035] A preparation method of KOH-microwave activated corncob activated carbon for treating cationic dye wastewater, the steps are as follows:

[0036] (1) Wash the corn cob with distilled water. Then, it is dried in a constant temperature blast drying oven. Next, take the dried corncobs and crush them with a pulverizer and pass them through a 50-mesh sieve, spread the sieved corncob powder evenly in a vacuum drying oven, and dry them at 60°C for 24 hours to remove the moisture of the raw materials . Finally, the dried corncob powder is collected and placed in a desiccator for future use.

[0037] (2) Add 5 g of corncob powder into 100 mL of KOH solution with a mass fraction of 10 wt %, stir and mix evenly.

[0038] (3) The mixture obtained in step (2) was placed in a 250mL round-bottomed flask, and after adding a magnet, it was refluxed in a constant temperature water bath at 80°C for 5h. After the reflux was completed, the mixture was placed in a vacuum drying oven and ...

Embodiment 3

[0045] A preparation method of KOH-microwave activated corncob activated carbon for treating cationic dye wastewater, the steps are as follows:

[0046](1) Wash the corn cob with distilled water. Then, it is dried in a constant temperature blast drying oven. Next, take the dried corncobs and crush them with a pulverizer and pass them through a 50-mesh sieve, spread the sieved corncob powder evenly in a vacuum drying oven, and dry them at 60°C for 24 hours to remove the moisture of the raw materials . Finally, the dried corncob powder is collected and placed in a desiccator for future use.

[0047] (2) Add 5 g of corncob powder into 100 mL of KOH solution with a mass fraction of 10 wt %, stir and mix evenly.

[0048] (3) The mixture obtained in step (2) was placed in a 250mL round-bottomed flask, and after adding a magnet, it was refluxed in a constant temperature water bath at 80°C for 5h. After the reflux was completed, the mixture was placed in a vacuum drying oven and d...

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Abstract

The invention relates to a preparation method of KOH-microwave activated corncob activated carbon for treating cationic dye-containing wastewater. The preparation method comprises the following steps:step 1, pretreating raw materials; step 2, weighing the raw materials; step 3, performing heating reflux; step 4, performing microwave activation; step 5, washing and filtering; step 6, drying; and step 7, cooling and storing. The activated carbon prepared by the method has a large number of microporous structures, is uniform in pore size distribution, contains rich oxygen-containing functional groups on the surface, is beneficial to attachment and deposition of dye molecules on the surface, and is more suitable for adsorption. The removal rate of methylene blue dye can reach 99.9% at most, the maximum adsorption capacity can reach 636.9 mg / g, the product can be used for treating cationic dye-containing wastewater, and the product is simple in preparation process, low in cost, green, environmentally friendly and easy to popularize.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a preparation method of KOH-microwave activated corncob activated carbon for treating wastewater containing cationic dyes. Background technique [0002] Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. Printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. There are many methods for treating printing and dyeing wastewater, including hydrogen peroxide oxidation, biodegradation, electrolysis and adsorption. The hydrogen peroxide oxidation method has a simple treatment process, can effectively reduce the chroma of wastewater, and has no secondary pollution, but the removal rate ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/30
CPCB01J20/20C02F1/283C02F2101/308
Inventor 韦会鸽周登凤李岱原王晖崔大鹏
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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