Preparation method of porous starch-metal organic framework composite material

A metal organic framework, porous starch technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve problems such as limited application, achieve fast adsorption rate, low cost, strong sulfonamide adsorption effect of ability

Active Publication Date: 2020-01-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MOF materials are silty crystals with nanoscale sizes, which greatly limits their applications.

Method used

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  • Preparation method of porous starch-metal organic framework composite material
  • Preparation method of porous starch-metal organic framework composite material
  • Preparation method of porous starch-metal organic framework composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of raw materials

[0040]a) Preparation of porous starch: Disperse 10 g of corn starch in citric acid buffer (50 mL) at pH 5.0, add 0.10 mL of α-amylase and glucoamylase compound enzyme (1:3, v / v) at 50 ° C React for 5 hours, inactivate the enzyme, dry, and pass through a 100-mesh sieve to prepare porous starch.

[0041] b) Synthesis of metal-organic framework materials: 4.8 g of zirconium chloride and 4.4 g of phthalic acid were dispersed in 100 mL of deionized water, and treated at 100° C. for 24 h using the reflux method. The sample obtained after reflux was further washed with deionized water, and 80 mL of deionized water was added to reflux for a second time for 16 h. The sample is centrifuged, freeze-dried, and pulverized to obtain the metal-organic framework material.

[0042] (2) Immobilization of porous starch-metal organic framework composites

[0043] a) Electrostatic adsorption: First, 0.2g of low-viscosity chitosan was heated and dissolve...

Embodiment 2

[0055] (1) Preparation of raw materials

[0056] a) Preparation of porous starch: Disperse 12 g of corn starch in citric acid buffer (60 mL) at pH 5.0, add 0.15 mL of α-amylase and glucoamylase complex enzyme (1:2, v / v) at 55 ° C React for 6 hours, inactivate the enzyme, dry, and pass through a 100-mesh sieve to prepare porous starch.

[0057] b) Synthesis of metal-organic framework materials: 2.4 g of zirconium chloride and 2.2 g of phthalic acid were dispersed in 50 mL of deionized water, and treated at 110° C. for 20 h using the reflux method. The sample obtained after reflux was further washed with deionized water, and 90 mL of deionized water was added to reflux for a second time for 15 h. The sample is centrifuged, freeze-dried, and pulverized to obtain the metal-organic framework material.

[0058] (2) Immobilization of porous starch-metal organic framework composites

[0059] a) Electrostatic adsorption: First, 0.3g of low-viscosity chitosan was dissolved by heating...

Embodiment 3

[0065] (1) Preparation of raw materials

[0066] a) Preparation of porous starch: Disperse 9 g of corn starch in citrate buffer (55 mL) at pH 5.2, add 0.10 mL of α-amylase and glucoamylase complex enzyme (1:3, v / v) at 55 ° C React for 5 hours, inactivate the enzyme, dry, and pass through an 80-mesh sieve to prepare porous starch.

[0067] b) Synthesis of metal-organic framework materials: 4.8 g of zirconium chloride and 4.4 g of phthalic acid were dispersed in 100 mL of deionized water, and treated at 95° C. for 30 h using the reflux method. The sample obtained after reflux was further washed with deionized water, and 80 mL of deionized water was added to reflux for a second time for 20 h. The sample is centrifuged, freeze-dried, and pulverized to obtain the metal-organic framework material.

[0068] (2) Immobilization of porous starch-metal organic framework composites

[0069] a) Electrostatic adsorption: First, 0.1 g of low viscosity was dissolved by heating with 0.01 mo...

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Abstract

The invention discloses a preparation method of a porous starch-metal organic framework composite material. The method comprises the following steps: dispersing starch in a citric acid buffer solution, and adding a compound enzyme to prepare porous starch; synthesizing a metal organic framework material; carrying out an ultrasonic reaction on chitosan and the metal organic framework material at apH value of 4.5-5.5; and dropwise adding the obtained suspension into a porous starch suspension with the concentration of 5-8 wt%, and drying and crushing the obtained mixture to obtain the porous starch-metal organic framework composite material. The MOF loading rate of the composite material can reach 10.76%, test of the capacity of the composite material for adsorbing sulfonamides in water shows that the adsorption capacity of the composite material in a low-sulfonamide solution with a concentration of 40 mg / L is 46.46 mg / g, and the adsorption capacity is 31.11 mg / g after the composite material is repeatedly used for four times. The composite material absorbs medicinal chemical substances in water, has the characteristics of simple process and low cost, and realizes immobilization andrecycling of the nano-scale MOF material.

Description

technical field [0001] The invention relates to a metal organic framework material, in particular to a porous starch-metal organic framework composite material adsorbing sulfonamide and a preparation method thereof; it belongs to the field of pharmaceutical wastewater treatment and is used for the removal of pharmaceutical chemical substances in environmental water bodies. Background technique [0002] In the pharmaceutical industry, natural or synthetic pharmaceutical chemicals and their secondary products are often inevitably migrated from industrial sewage and domestic water to environmental water bodies, some of which are sensitizing, teratogenic or even mutagenic chemicals Substances have greatly threatened the safety of domestic water, agricultural products and aquatic products. It is understood that more than 200 different medicinal chemicals have been detected in rivers, lakes and oceans. The broad-spectrum antibiotic sulfonamide has strong sensitization and certain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/34C02F101/38C02F103/34
CPCB01J20/226B01J20/24B01J20/3042C02F1/288C02F2101/34C02F2101/38C02F2101/40C02F2103/343
Inventor 黄强贾祥泽张斌扶雄
Owner SOUTH CHINA UNIV OF TECH
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