A kind of preparation method of modified dialdehyde starch for adsorbing lead ions

A technology of dialdehyde starch and lead ions, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem that the modified dialdehyde starch lead ion has no ideal effect, and achieve easy industrial production , good adsorption performance, simple process effect

Active Publication Date: 2022-03-11
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, until now, the modified dialdehyde starch has not had a very satisfactory effect on the removal of lead ions in water.

Method used

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  • A kind of preparation method of modified dialdehyde starch for adsorbing lead ions
  • A kind of preparation method of modified dialdehyde starch for adsorbing lead ions
  • A kind of preparation method of modified dialdehyde starch for adsorbing lead ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of Dialdehyde Starch (DAS)

[0024] Weigh 4g of potato starch, add 5mL of deionized water and stir constantly to form a suspension, place it in a dark box, then slowly add 80mL of sodium periodate with a concentration of 0.5mol / L dropwise, and then adjust the pH value with 0.05mol / L of dilute sulfuric acid for 3. Under the condition of 30° C., react in the dark for 1 hour, filter and wash with deionized water until neutral, and dry in an oven at 50° C. to obtain dialdehyde starch (DAS).

[0025] (2) Preparation of 5-aminoisophthalate-modified dialdehyde starch (DASD5-A)

[0026] 3g of methyl 5-aminoisophthalate was dissolved in a three-necked flask with 50mL of organic solution, and 4g of DAS obtained in step (1) was added to the above-mentioned three-necked flask, and 0.2mL of glacial acetic acid was added dropwise. After reacting at 30° C. for 4 hours under the protection of the protection, it was washed with absolute ethanol and dried overnight at 5...

Embodiment 2

[0032] (1) Preparation of Dialdehyde Starch (DAS)

[0033] Weigh 6g of corn starch, add 10mL of deionized water and stir continuously to form a suspension, place it in a dark box, then slowly add 100mL of sodium periodate with a concentration of 1.0mol / L dropwise, and then adjust the pH value with 0.1mol / L of dilute sulfuric acid for 4. Under the condition of 50° C., react in the dark for 4 hours, filter and wash with deionized water until neutral, and dry in an oven at 60° C. to obtain dialdehyde starch (DAS).

[0034] (2) Preparation of 5-aminoisophthalate-modified dialdehyde starch (DASD5-A)

[0035] 5g of methyl 5-aminoisophthalate was dissolved in a three-necked flask with 80mL of organic solution, and 6g of DAS obtained in step (1) was added to the above-mentioned three-necked flask, and 0.3mL of glacial acetic acid was added dropwise. After reacting at 60° C. for 8 hours under the protection of gas, it was washed with anhydrous methanol and dried overnight at 60° C. t...

Embodiment 3

[0041] (1) Preparation of Dialdehyde Starch (DAS)

[0042] Weigh 8g of tapioca starch, add 20mL of deionized water and stir continuously to form a suspension, place it in a dark box, then slowly add 120mL of sodium periodate with a concentration of 1.2mol / L dropwise, and then adjust the pH value with 0.15mol / L of dilute sulfuric acid for 4. Under the condition of 60°C, react in the dark for 6 hours, filter and wash with deionized water until neutral, place in an oven and dry at 70°C to obtain dialdehyde starch (DAS).

[0043] (2) Preparation of 5-aminoisophthalate-modified dialdehyde starch (DASD5-A)

[0044]The 5-aminoisophthalic acid methyl ester of 7g is dissolved in the three-necked flask that 100mL organic solution is housed, the DAS that 8g step (1) obtains is added in the above-mentioned three-necked flask again, 0.5mL glacial acetic acid is added dropwise, under argon After reacting at 70° C. for 12 hours under the protection of gas, it was washed with anhydrous DMSO...

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Abstract

The invention relates to a preparation method of modified dialdehyde starch for adsorbing lead ions, which belongs to the field of heavy metal ion adsorbent preparation. The preparation method first oxidizes starch into dialdehyde starch, which is DAS, 5-aminoisophenylene Methyl formate is introduced into its surface to obtain 5-aminoisophthalate-modified dialdehyde starch, which is DASD5-A, and then the surface is hydrazinolylated to obtain hydrazinolylated modified dialdehyde starch, which is NH 2 ‑DAS, and finally undergo a Schiff base reaction to obtain 2‑acetylthiophene modified dialdehyde starch, which is DAS2‑AT. This method not only broadens the method of dialdehyde starch surface functionalization, but also endows dialdehyde starch with good adsorption performance for lead ions. The method has the advantages of simple and flexible process, mild reaction conditions, low cost and easy industrial production.

Description

technical field [0001] The invention belongs to the field of adsorbent preparation, in particular to a method for preparing modified dialdehyde starch for adsorbing lead ions. Background technique [0002] In recent years, with the development of industry and agriculture, the pollution of heavy metal ions has become more and more serious. Reports of getting sick due to heavy metal ion pollution are not uncommon in various places. Heavy metal ion pollution has become a problem that human beings must face and urgently need to be solved. [0003] Adsorption is an important method for industrial separation and recovery of heavy metal ions in water. Commonly used adsorbents include activated carbon, molecular sieves, graphene, and biopolymers. Starch is a natural biological polysaccharide material, which has attracted the attention of researchers because of its low price and easy availability. Starch can be oxidized by periodate to obtain dialdehyde starch (DAS). At this time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24C02F1/286C02F2101/20
Inventor 郭宇肖昱吴红梅
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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