Fe-doped walnut shell activated carbon for treating dye wastewater as well as preparation method and application of activated carbon

A technology for dye wastewater and walnut shells, which is applied in energy wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of slow adsorption rate, difficulty in meeting production needs, poor effect, etc., and achieve fast adsorption rate and reduce Remarkable effect on treatment cost and adsorption capacity

Active Publication Date: 2016-06-15
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this material has dual functions of adsorption and catalytic degradation, in the process of treating organic dye wastewater, only 85% to 95% of organic dyes of 20mg / L to 70mg / L after 30min, the adsorption rate is slow, and the effect is relatively low. Poor, difficult to meet actual production needs

Method used

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  • Fe-doped walnut shell activated carbon for treating dye wastewater as well as preparation method and application of activated carbon
  • Fe-doped walnut shell activated carbon for treating dye wastewater as well as preparation method and application of activated carbon
  • Fe-doped walnut shell activated carbon for treating dye wastewater as well as preparation method and application of activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method for Fe-doped walnut shell activated carbon, comprising the following steps:

[0046] (1) Acid treatment: Grind and sieve walnut shells, take walnut shell powder larger than 100 mesh, and dry at 110° C. for 24 hours. Weigh 5 g of the dried walnut shell powder, add it to a mixed solution of hydrochloric acid and hydrofluoric acid with a mass fraction of 5%, heat it in a water bath at 25°C, stir it with a magnetic force at a speed of 260 rpm / min, and stir it for 2 hours for washing. Suction filtration until the filtrate is neutral. The filter cake was dried in an electric blast drying oven at 120°C for 12 hours to obtain a walnut shell pickling product.

[0047] (2) Inorganic salt treatment: Take 2g of the walnut shell pickling product, add it to 200mL of 10mmol / L ferrous ammonium sulfate solution, heat in a water bath at 25°C, stir magnetically at a speed of 260rpm / min for 12h, and then mix the obtained The solution was rotary evaporated at 80°C for...

Embodiment 2

[0066] The preparation method of the Fe-doped walnut shell activated carbon of the present embodiment may further comprise the steps:

[0067] The preparation steps are basically the same as in Example 1, except that in step (2), the concentration of the ferrous ammonium sulfate solution is 20mmol / L, and all the other steps are the same.

[0068] The Fe-doped walnut shell activated carbon obtained in Example 2 was adsorbed on the methylene blue solution of 100mg / L~600mg / L under the same conditions as in Example 1. The results showed that the maximum adsorption capacity of Fe-doped walnut shell activated carbon to methylene blue solution was lower than 400mg / g.

Embodiment 3

[0070] The preparation method of the Fe-doped walnut shell activated carbon of the present embodiment may further comprise the steps:

[0071] The preparation steps are the same as in Example 1, except that in step (2), the concentration of ammonium ferrous sulfate solution is 5mmol / L, and all the other steps are the same.

[0072] The Fe-doped walnut shell activated carbon obtained in Example 3 was adsorbed on the methylene blue solution of 100mg / L~600mg / L under the same conditions as in Example 1. The results showed that the maximum adsorption capacity of Fe-doped walnut shell activated carbon to methylene blue solution was 491.327mg / g.

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Abstract

The invention discloses Fe-doped walnut shell activated carbon for treating dye wastewater as well as a preparation method and an application of the activated carbon. The Fe-doped walnut shell activated carbon takes walnut shells as a raw material and is prepared through acid solution treatment, inorganic salt treatment, pyrolysis treatment, activating treatment and high-temperature heat treatment. The Fe-doped walnut shell activated carbon has the Fe content of 2.15%(wt%), the specific surface area of 1779.31 m<2>/g, the maximum adsorption of 531.08 mg/g for methylene blue as well as the adsorption exceeding 500 mg/g for other dyes including methyl orange, malachite green and methyl red. The Fe-doped walnut shell activated carbon is high in adsorption capacity, high in adsorption speed, easy to recycle and reusable, and the treatment cost is greatly saved. Meanwhile, according to the method, the waste walnut shells are taken as the raw material, operation is convenient, the cost is low, secondary pollution cannot be caused, and agricultural waste is recycled.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to Fe-doped walnut shell activated carbon for treating dye wastewater, a preparation method and application thereof. Background technique [0002] With the improvement of human living standards, synthetic dyes are used in various industrial fields to meet human needs, including textile industry, plastic product manufacturing, paper industry, paint processing, rubber synthesis, leather processing, food industry, cosmetics manufacturing, etc. It has been proven that approximately 10% to 15% of the dye is lost during dye processing and is discharged into the environment as waste water. Dye wastewater has five characteristics: high concentration, high chroma, high pH value, multiple changes and refractory degradation. Therefore, as a major threat to water pollution, the treatment of dye wastewater has attracted more and more attention. More importantly, the dyes in the water will be en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/20B01J20/28C02F1/28
CPCY02W10/37B01J20/20B01J20/02B01J20/0281B01J20/041B01J20/28066B01J2220/485C02F1/283C02F2101/308C02F2101/36C02F2101/38
Inventor 李爽张超
Owner NORTHWEST UNIV(CN)
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