Preparation method of rice husk based porous carbon fungaltoxin adsorbent

A technology of mycotoxins and adsorbents, which is applied in the field of food and feed detoxification, can solve the problems such as no reports on the adsorption of mycotoxins, and achieve the effects of stable adsorption, low desorption rate and simple preparation process.

Active Publication Date: 2013-01-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption of rice husk-based porous carbon to mycotoxins has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take aflatoxin as an example

[0030] After cleaning and drying 100g of rice husk, pre-carbonize in a muffle furnace at 220°C for 1 hour, then impregnate the pre-carbonized product with 10% sodium hydroxide solution for 24 hours, filter it, place it in a sintering furnace for 2 hours at 500°C, and cool it to After washing at room temperature to neutrality, the solid matter was dried to obtain rice husk-based porous carbon with a specific surface area of ​​85m 2 / g. When the concentration of aflatoxin was as high as 1 μg / mL, the removal rate of aflatoxin was 98.9%, and the desorption rate was 3.1% in 8 hours.

Embodiment 2

[0032] Taking zearalenone as an example

[0033] After cleaning and drying 100g of rice husk, pre-carbonize in a muffle furnace at 250°C for 1 hour, then impregnate the pre-carbonized product with 10% sodium hydroxide solution for 24 hours, filter it, place it in a sintering furnace for 4 hours at 600°C, and cool it to After washing at room temperature to neutrality, the solid matter was dried to obtain rice husk-based porous carbon with a specific surface area of ​​351m 2 / g. When the concentration of zearalenone was as high as 1 μg / mL, the removal rate of zearalenone was 99.3%, and the 8h desorption rate was 1.0%.

Embodiment 3

[0035] Take aflatoxin as an example

[0036] After cleaning and drying 100g of rice husk, pre-carbonize in a muffle furnace at 250°C for 0.5h, then impregnate the pre-carbonized product with 5% sodium hydroxide solution for 22h, filter it, place it in a sintering furnace for 3h at 600°C, and cool it. After reaching room temperature, wash to neutrality, dry the solid to obtain rice husk-based porous carbon, and its specific surface area is 138m 2 / g. When the concentration of aflatoxin was as high as 1 μg / mL, the removal rate of aflatoxin was 99.7%, and the desorption rate was 1.0% in 8 hours.

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Abstract

The invention discloses a preparation method of a rice husk based porous carbon fungaltoxin adsorbent. The preparation method uses rice husks to serve as raw materials, immersion treatment is carried out by using aqueous alkali in certain concentration through low temperature pre-carbonization, and finally firing is carried out under a condition that air is isolated to generate end products of the adsorbent. In a scope from acidic property to neutral, when the concentration of various fungaltoxins is as high as 1mng/mL, removing rate of rice husk based porous carbon on the various fungaltoxins is higher than 98%, adsorption is stable, and desorption rate in 8h is all lower than 5%, so that the rice husk based porous carbon is an excellent fungaltoxin adsorbent. The rice husk based porous carbon is safe, non-toxic and low in content of impurities such as heavy metal, and is an ideal adsorbent product for removing fungaltoxin pollution in foods and feeds.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent, in particular to a method for preparing a mycotoxin adsorbent by using rice husk as a raw material, and belongs to the technical field of food and feed detoxification. Background technique [0002] Fungi are widely distributed in nature, with various types and large numbers, and are closely related to humans. Many fungi are beneficial to humans, while some are harmful to humans. Mycotoxins are secondary metabolites produced by fungi. As early as the 1920s, people have noticed the phenomenon of mycotoxin poisoning. Due to the biological characteristics of the fungus, it mainly pollutes wet or semi-dry stored foods, so the contamination of grain soybeans is particularly serious. According to the report of the Food and Agriculture Organization of the United Nations (FAO), about 25% of the crops in the world are polluted by fungi and their toxins every year, and about 2% of the crops lose thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30A23L1/015A23K1/14A23K1/16A23L5/20
CPCY02P60/87
Inventor 李晓瑄陆凤凤
Owner JIANGNAN UNIV
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