Application and preparation method of a biomass adsorbent modified by straw

A technology of biomass adsorbent and adsorbent, which is applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problem of high cost of activated carbon, achieve high adsorption efficiency, improve adsorption capacity, and improve the effect of capacity

Active Publication Date: 2020-11-10
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used adsorbent is activated carbon, which has excellent adsorption performance, but usually the preparation process includes two steps of anaerobic roasting and chemical activation, resulting in high cost of activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The preparation method of the above-mentioned biomass adsorbent modified by straw comprises the following steps:

[0018] (1) Straw pretreatment: wash and pulverize the straw, sieve it, and dry it in a vacuum oven;

[0019] (2) Alkalinization of straw: Disperse the dried straw in lye, take it out after ultrasonic vibration for 10-15min, put it in a constant temperature water bath, stir it at a constant temperature of 60-75°C for 1-2h, filter and wash to neutrality, then centrifuged and then placed in an oven to dry at 80°C to constant weight and set aside;

[0020] (3) Modification of straw: Weigh 2 g of straw after alkalization treatment, add 20 mL of glacial acetic acid, 2-8 g of acetic anhydride, 0.1-0.2 g of catalyst, and stir at a constant temperature of 60-80 °C for 4-6 h; After natural cooling, the straw is washed, and finally dried at 60° C. to a constant weight to obtain a straw-modified biomass adsorbent.

[0021] Further, the straw in step (1) is corn straw...

Embodiment 1

[0031] The preparation method of the biomass adsorbent utilizing straw modification in this embodiment is:

[0032] (1) Straw pretreatment: Wash and pulverize the straw, pass it through an 80-mesh sieve, take out the part under the sieve, put it in a vacuum oven, dry it at 60°C for 24 hours, and take it out.

[0033] (2) Alkalinization of straw: Take 5 g of straw powder obtained in step (1), disperse it in 100 mL of NaOH solution with a mass fraction of 7%, take it out after ultrasonic vibration for 10 min, put it in a constant temperature water bath, and heat it at 75 ° C Stir at constant temperature for 1 hour, filter, wash until neutral, centrifuge, put in an oven, and dry at 80°C until constant weight.

[0034] (3) Modification of straw: Weigh 2 g of straw after alkalization treatment in step (2) and put it into a three-necked flask, add 20 mL of glacial acetic acid, 6 g of acetic anhydride, and 0.2 g of catalyst p-toluenesulfonic acid at 60°C Stir at constant temperature...

Embodiment 2

[0040] The preparation method of the biomass adsorbent utilizing straw modification in this embodiment is:

[0041] (1) Straw pretreatment: Wash and pulverize the straw, pass it through a 100-mesh sieve, take out the part under the sieve, place it in a vacuum oven, dry it at 50°C for 24 hours, and take it out.

[0042] (2) Alkalinization of straw: Take 5 g of the straw powder obtained in step (1), disperse it in 100 mL of NaOH solution with a mass fraction of 5%, take it out after ultrasonic vibration for 10 min, put it in a constant temperature water bath, and heat it at 60°C Stir at constant temperature for 2 hours, filter, wash, and centrifuge, then place in an oven, and dry at 80°C until constant weight.

[0043](3) Modification of straw: Weigh 2 g of straw after alkalization treatment in step (2) and put it into a three-necked flask, add 20 mL of glacial acetic acid, 4 g of acetic anhydride, 0.1 g of catalyst perchloric acid, and stir at a constant temperature for 5 h at ...

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PUM

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Abstract

The invention relates to an application and a preparation method of a biomass adsorbent modified by straws. The straw modified biomass adsorbent is applied to removal of chlorinated aromatic hydrocarbons in a gas phase. The application process comprises the following steps: adding a certain mass of modified biomass adsorbent into a gas containing chlorinated aromatic hydrocarbon; under the conditions that the adsorption temperature is 50 DEG C and the total gas flow is 60 ml / min, performing adsorption for 5-90 min. The acetylated straw material is used for adsorbing chlorinated aromatic hydrocarbon in a gas phase, a new method is provided for removing chlorinated aromatic hydrocarbon in flue gas, and the application range of the biomass modified material is widened. The invention providesa new idea for effective resource utilization of the agricultural waste straw.

Description

technical field [0001] The invention belongs to the technical field of preparation of adsorption materials, and in particular relates to the application and preparation method of a straw-modified biomass adsorbent. Background technique [0002] A variety of chlorinated aromatics are emitted in industrial processes such as waste incineration, fossil fuel combustion, and iron ore sintering. Most of the chlorinated aromatics are highly toxic and refractory persistent organic pollutants, which have great harm to the environment and human health. The research on the reduction technology of chlorinated aromatic hydrocarbons has become a hot spot in the field of environmental chemistry at home and abroad. The technologies for eliminating chlorinated aromatics pollutants in incineration flue gas mainly include adsorption method, biodegradation method, photocatalytic degradation method, combustion method, wet catalytic oxidation method, catalytic hydrodechlorination method, etc. Ads...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/02
Inventor 俞勇梅马小东李咸伟王淑荣刘道清胡子国
Owner NANKAI UNIV
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