A preparation method of magnetic mesoporous silica adsorbent for removing aflatoxin in edible oil

Abstract

The invention relates to a preparation method of a magnetic mesoporous silicon dioxide adsorbent for removing aflatoxin in edible oil. The preparation method specifically comprises the following steps: (1) dissolving rice hull ash and an alkali solid to obtain a rice hull ash alkaline solution; (2) after adding ferric salt, quickly adding stronger ammonia water and heating and stirring; filtering and separating, washing, drying and grinding precipitate; (3) putting magnetic microparticles and a cationic surface active agent in a beaker, dropwise adding an adjuvant, carrying out ultrasonic dispersion, stirring, adding the rice hull ash alkaline solution to adjust the pH value, maintaining the temperature, and further stirring; and (4) after reaction, aging, carrying out centrifugal separation on the precipitate, washing the precipitate by deionized water for several times, and after drying, carbonizing and calcining the precipitate, removing the cationic surface active agent to obtain a product which is the magnetic mesoporous silicon dioxide adsorbent. The preparation method provided by the invention is simple in preparation process and mild in condition, raw materials are low in cost, and the obtained magnetic mesoporous silicon dioxide adsorbent is high in specific surface area, can be used for effectively removing aflatoxin B1 in edible oil, is easily separated from food materials, and can be repeatedly used.

Description

technical field [0001] The invention relates to the field of fine inorganic chemical industry and food pollution control, in particular to a method for removing aflatoxin B in edible oil 1 1. A method for preparing a magnetic mesoporous silica adsorbent by using rice husk ash as a silicon source. Background technique [0002] Aflatoxin (AFT) is a secondary metabolite produced by fungi such as Aspergillus flavus and A. parasiticus. There are more than 20 kinds of aflatoxins that have been isolated and identified, the common ones are AFB 1 、AFB 2 、AFG 1 、AFG 2 、AFM 1 、AFM 2 Wait for a few. The International Agency for Research on Cancer classified aflatoxins as Class I carcinogens in 1993, of which AFB 1 It is recognized as the most carcinogenic substance. Aflatoxins have strong thermal stability and can only be cracked when heated above 280°C. Aflatoxin exists in a wide range and is one of the common pollutants in food in developing countries. It is very easy to con...

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Problems solved by technology

[0006] Currently published or authorized Chinese invention patents, such as CN200710055604.6, CN201310222225.7, and CN200710171827.9 disclosed in the preparation method of mesoporous silica-magnetic composite particles, the particle specific surface area is small (10 ~ 500m 2 / g), leading to limited adsorption capacity; CN201310101163.4 discloses a method for synthesizing magnetic mesoporous silica nanospheres with a core-shell structure under acidic conditions. The specific surface area of ​​the obtained material is large, but it needs to be carried out in a reactor, and The operation method and required equipment are complicated, and the reaction takes a long time (more than 2 days)

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