Preparation method of magnetic mesoporous silicon dioxide adsorbent for removing aflatoxin in edible oil

A technology of mesoporous silica and aflatoxin, applied in chemical instruments and methods, oil/fat refining, alkali metal oxides/hydroxides, etc. Long time, small specific surface area of ​​particles, etc., to achieve the effect of low raw material cost, high detoxification efficiency, and improved utilization rate

Active Publication Date: 2015-04-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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)

Method used

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  • Preparation method of magnetic mesoporous silicon dioxide adsorbent for removing aflatoxin in edible oil

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Take by weighing 6.4g of rice husk ash and 8.0g of sodium hydroxide solid in a mass ratio of 0.8:1, heat and dissolve in deionized water, and filter with suction, and the filtrate is constant to 250mL to obtain a rice husk ash-alkali solution;

[0021] (2) Add 150mL deionized water and 2mL hydrazine hydrate into a 250mL three-neck flask, stir mechanically for 30min to remove oxygen, and 3+ :Fe 2+ =1.75:1 After adding ferric chloride hexahydrate and ferrous sulfate nonahydrate into the flask, quickly add 8mL ammonia water (v / v=25%), heat to 80°C, and continue stirring for 30min; Wash with absolute ethanol for several times, vacuum dry and grind to obtain magnetic particles;

[0022] (3) Weigh 0.1g of magnetic particles and 0.75g of CTAB into a 500mL beaker, add 2mL of absolute ethanol dropwise, ultrasonically disperse for 30min, mechanically stir at 80°C, add 50mL of rice husk ash-alkali solution, adjust the pH value to 3, maintain the temperature and continue Stir...

Embodiment 2

[0025] (1) Weigh 9.6g of rice husk ash and 8.0g of sodium hydroxide solid at a mass ratio of 1.2:1, add deionized water to dissolve, heat for dissolution, and filter with suction, and the filtrate is constant to 250mL to obtain a rice husk ash-alkaline solution;

[0026] (2) Add 150mL deionized water and 2mL hydrazine hydrate into a 250mL three-neck flask, stir mechanically for 30min to remove oxygen, and 3+ :Fe 2+ =1.75:1 After adding ferric chloride hexahydrate and ferrous sulfate nonahydrate into the flask, quickly add 8mL of ammonia water, heat to 80°C, and continue stirring for 30min; the precipitate is separated by filtration, washed several times with deionized water and absolute ethanol, Vacuum drying and grinding to obtain magnetic particles;

[0027] (3) Weigh 0.15g of magnetic particles and 1.5g of CTAB into a 500mL beaker, add 2mL of absolute ethanol dropwise, ultrasonically disperse for 30min, stir mechanically at 80°C, add 65mL of rice husk ash-alkali solution, ad...

Embodiment 3

[0030] (1) Take by weighing 12.8g of rice husk ash and 8.0g of sodium hydroxide solid in a mass ratio of 1.6:1, add deionized water to heat and dissolve, and filter with suction, and the filtrate is constant to 250mL to obtain a rice husk ash-alkali solution;

[0031] (2) Add 150mL deionized water and 2mL hydrazine hydrate into a 250mL three-neck flask, stir mechanically for 30min to remove oxygen, and 3+ :Fe 2+ =1.75:1 After adding ferric chloride hexahydrate and ferrous sulfate nonahydrate into the flask, quickly add 8mL of ammonia water, heat to 80°C, and continue stirring for 30min; the precipitate is separated by filtration, washed several times with deionized water and absolute ethanol, Vacuum drying and grinding to obtain magnetic particles;

[0032] (3) Weigh 0.2g of magnetic particles and 1.5g of CTAB into a 500mL beaker, add 2mL of absolute ethanol dropwise, ultrasonically disperse for 30min, stir mechanically at 80°C, add 50mL of rice husk ash-alkali solution, adju...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C11B3/10
CPCB01J20/06B01J20/103B01J20/28009B01J20/28016B01J20/28054B01J20/28057C11B3/10
Inventor 陈正行赵秀平王韧王莉李亚男罗小虎
Owner JIANGNAN UNIV
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