Method for preparing modified polyamine porous starch

A technology of porous starch and amine modification, applied in the field of modified starch, achieves the effect of high removal rate of sulfonic acid group, saving social resources and high utilization efficiency

Inactive Publication Date: 2010-06-30
TONGJI UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

Polyaminated modification of porous starch and multi-directional advantages as a water treatment agent (higher molecular weight of natural polymers are conducive to adsorpt...

Method used

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  • Method for preparing modified polyamine porous starch
  • Method for preparing modified polyamine porous starch

Examples

Experimental program
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Effect test

Embodiment 1

[0029] First, 30 g of commercially available potato starch was used as a raw material and dissolved in 200 mL of a buffer solution with a pH of 5 to obtain a starch slurry with a starch concentration of 15% by mass. The buffer solution is obtained by measuring the mass ratio of citric acid: disodium hydrogen phosphate = 1:2, and then adding water and stirring evenly. Then add the compound enzyme that is made up of the glucoamylase of 0.15g and 0.75g α-amylase in the starch slurry, the addition of compound enzyme is 3.0% of starch weight, then at 45 ℃ and constant temperature reaction 8h under the condition of shaking in water bath, then Take it out from the water bath and add 5 mL of 4% sodium hydroxide solution by mass percentage to terminate the enzymatic hydrolysis reaction. Then filter and separate to obtain the solid and supernatant, wash the solid with distilled water until the pH value is neutral, and finally vacuum-dry at 45°C for 12 hours to obtain a white powder that...

Embodiment 2

[0035]30g potato starch was dissolved in the same 200mL pH as in Example 1 in the buffer solution of sodium citrate-disodium hydrogen phosphate of 5 to obtain a starch slurry with a concentration of 15% by mass. Add a compound enzyme consisting of 0.25 g of glucoamylase and 0.50 g of α-amylase to the starch slurry. The amount of the compound enzyme added is 2.5% of the weight of the starch, followed by a constant temperature reaction at 60 ° C and a water bath for 18 hours, then taken out and removed. Add 5 mL of 4% sodium hydroxide solution by mass to terminate the enzymatic hydrolysis reaction. Then filter and separate to obtain the solid and supernatant, wash the solid with distilled water until the pH value is neutral, and finally vacuum-dry at 45°C for 12 hours to obtain a white powder that is porous starch, and the porous starch has a water absorption rate of ≥1.73g / g

[0036] Add 20mL of dilute lye and 2mL of epichlorohydrin to 5g of porous starch, stir and mix well, th...

Embodiment 3

[0040] Corn starch is used as raw material, diethylenetriamine is used as polyamine agent, and other formulas and processes are the same as those in Example 1 to obtain diethylenetriamine-modified corn porous starch.

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Abstract

The invention relates to a method for preparing modified polyamine porous starch obtained through the following steps: preparing starch as the raw material and compound enzymes into porous starch; cross-linking the porous starch; modifying the porous starch through etherification; and grafting different polyamine molecules. The modified polyamine porous starch is capable of absorbing AG25 and AR18 in wastewater by the hollow structure and grafted functional groups thereof, particularly, the removal rate of both AG25 and AR18 in the wastewater is higher than 98% according to the tests; the modified polyamine porous starch can be taken out and dipped in a sodium sulfate solution with the molar concentration thereof being 0.05mol/L to 1mol/L for desorption when the absorption effect is reduced, particularly, the desorption rate of AG25 and AR18 is higher than 90%; and the absorption effect of the modified polyamine porous starch is not reduced after being subjected to desorption and analysis for multiple times. Compared with the common porous starch, the product of the invention increases the absorption capacity by more than two times and ensures the high selectivity. Therefore, the method of the invention is of significant economic and social benefits and is applicable to the absorption treatment of heavy-metal ions and wastewater containing various dyes in the industries, such as printing and dyeing, textile and cosmetics.

Description

technical field [0001] The invention discloses a preparation method of polyamine-modified porous starch, which relates to a preparation process of porous starch used for wastewater treatment. It belongs to the technical field of modified starch. technical background [0002] Porous starch, also known as microporous starch, refers to the enzyme with raw amylase activity acting on raw starch granules below the starch gelatinization temperature to form a porous honeycomb product. Porous starch is a new type of starch Modified starch, its research and application are gradually receiving people's attention. Compared with native starch, porous starch has the following characteristics: (1) larger specific pore volume; (2) larger specific surface area; (3) low bulk density and particle density; (4) good water and oil absorption capacity ; (5) Good mechanical strength in dry state; (6) Dispersed in water and other solvents, it can maintain obvious structural integrity. At present,...

Claims

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Application Information

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IPC IPC(8): C08B31/00C08B31/12C08J3/24C02F1/28C02F1/62C02F101/20
Inventor 王作华相波江志平曲乐李义久程友魁
Owner TONGJI UNIV
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