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Preparation method and application of crosslinking-enzymolysis composite superfine modified starch adsorbent

An adsorbent and starch technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of small pore volume, shallow pore depth, easy damage, etc., and increase the specific surface area. and pore volume, the preparation process is simple, and the effect of improving the adsorption capacity

Inactive Publication Date: 2016-06-08
ANHUI AGRICULTURAL UNIVERSITY
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Problems solved by technology

However, the unsuitable enzymatic method will cause the disadvantages of porous starch such as small specific surface area, small pore volume, shallow pore depth, poor particle firmness, and easy breakage. These problems seriously affect the adsorption effect and practical application of porous starch.

Method used

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  • Preparation method and application of crosslinking-enzymolysis composite superfine modified starch adsorbent
  • Preparation method and application of crosslinking-enzymolysis composite superfine modified starch adsorbent

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Embodiment Construction

[0027] A preparation method of a cross-linking-enzymolysis composite ultrafine modified starch adsorbent, comprising the following steps:

[0028] (1) Dry three kinds of starches of corn, sweet potato and potato until the water content is less than 1%, and then carry out superfine pulverization respectively with a superfine pulverizer, the speed of the runner is 3500r / min, the speed of the cyclone separator is 3000r / min, and the pulverization time is 5h, the particle diameter is 10-50 μm superfine starch; then three kinds of superfine starches of corn, sweet potato and potato are mixed evenly with the ratio of mass ratio 1:4:3, then added into water and stirred to obtain starch emulsion; the total mass of starch and The mass ratio of water is preferably 40:60.

[0029] (2) Use sodium hydroxide solution with a mass concentration of 3% to adjust the pH of the starch emulsion to 7.5-8.5, then add sodium tripolyphosphate solution, mix well, and cross-link at 75°C-80°C for 1-1.5h. ...

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Abstract

Provided is a preparation method of a crosslinking-enzymolysis composite superfine modified starch adsorbent. The method comprises the steps that 1, corn, sweet potatoes and potatoes are superfinely ground into superfine starch with the granule size of 10-50 micrometers through a superfine grinder separately; 2, the three kinds of superfine starch are mixed to be uniform according to the mass ratio of 1:4:3, water is added into the materials, stirring is conducted, and starch emulsion is obtained; 3, the pH of the starch emulsion is adjusted to be 7.5-8.5, a certain amount of sodium tripolyphosphate solution is added, and crosslinking is conducted for 1-1.5 h at the temperature of 75 DEG C-80 DEG C; 4, centrifugal dewatering is conducted on crosslinked starch emulsion, the dewatered starch emulsion is washed with deionized water, and freeze drying is conducted; 5, the crosslinked starch is added with water and blended into starch emulsion again, the pH is adjusted to be 6.5-7.5, alpha-amylase and isoamylase are added, and an enzymolysis reaction is conducted for 12-15 h at the temperature of 50 DEG C; 6, the starch emulsion subjected to enzymolysis is centrifuged, washed and dried and then sieved through a 40-100-mesh sieve, and the crosslinking-enzymolysis composite superfine modified starch is obtained. The modified starch significantly increases the specific surface area of porous starch, improves the mechanical strength of the porous starch and improves the adsorption capacity of the porous starch on harmful ingredients, especially, heavy metal elements.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and in particular relates to ultrafinely modified starch through a cross-linking-enzymolysis method, which is used as an adsorbent in industrial waste water containing heavy metal ions and pollutants. Background technique [0002] Starch is a polysaccharide natural polymer compound formed by the condensation of glucose. It is a renewable substance with the most abundant sources in nature. It can be degraded and will not pollute the environment. There are a large number of reactive hydroxyl groups in its molecular chain, which provides a structural basis for the modification of starch. Modified starch is based on the inherent characteristics of natural starch. In order to improve the performance of starch and expand its application range, physical, chemical or enzymatic treatment is used to introduce new functional groups on starch molecules or change the size and size of starch molecules. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62C08J3/24C08L3/02
CPCB01J20/24B01J2220/4825C02F1/286C08J3/246C08J2303/02
Inventor 郭丽王水林朱晨晨
Owner ANHUI AGRICULTURAL UNIVERSITY
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