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Beta-cyclodextrin modified starch material for dye wastewater treatment

A technology of cyclodextrin and corn starch, which is applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. problem, to achieve the effect of strong removal performance, good removal effect, safe and environmentally friendly preparation process

Inactive Publication Date: 2017-09-01
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, cyclodextrin can be degraded naturally, is a green and environmentally friendly adsorption material, and has high application value, but cyclodextrin is expensive and difficult to industrialize (see Tong Linhui. Cyclodextrin Chemistry - Basics and Applications [M]. Beijing: Science Press, 2001.)
Although β-CD is easy to form inclusions with other organic substances, it is water-soluble and difficult to be directly used as an adsorption material in water

Method used

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  • Beta-cyclodextrin modified starch material for dye wastewater treatment
  • Beta-cyclodextrin modified starch material for dye wastewater treatment
  • Beta-cyclodextrin modified starch material for dye wastewater treatment

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preparation example Construction

[0027] The present invention has designed the preparation method (abbreviation preparation method) of cyclodextrin modified starch material simultaneously, this preparation method adopts the raw material mass fraction of cyclodextrin modified starch material of the present invention to form and following processing steps:

[0028] (1) Preparation of prepolymer (CA-β-CD) by semi-dry method: dissolve the stated number of β-cyclodextrin, citric acid, sodium hypophosphite and deionized water, stir thoroughly and place in blast In the oven, stand at 100°C for 1 hour, then take out and cool. The mixture was placed in a Soxhlet extractor, using absolute ethanol as a solvent, and refluxed at 90°C for 6 hours to remove the catalyst, unreacted citric acid and other by-products. Dissolve the crude product in distilled water, add isopropanol dropwise, filter after precipitation, wash three times to obtain pure prepolymer, and vacuum dry at 60°C for 24h.

[0029] (2) Preparation of cyclod...

Embodiment 1

[0039] Weigh 40.0g of β-cyclodextrin, 14.8g of citric acid (ca) and 1.9g of sodium hypophosphite into a beaker, add 24g of distilled water, stir thoroughly, place in a blast oven, and stand at 100°C for 1h Then take it out and cool it. The mixture is placed in a Soxhlet extractor, using absolute ethanol as a solvent, and refluxed at 90°C for 6 hours to remove the catalyst, unreacted citric acid and other by-products. Dissolve the crude product in distilled water, dropwise Add isopropanol, filter after precipitation, wash three times to obtain pure CA-β-CD, and vacuum dry at 60°C for 24h. The experimental results are shown in Table 2.

Embodiment 2

[0050] Weigh 4g of starch, 6g of prepolymer, and 0.18g of SHP into a beaker, then add 50ml of deionized water to make a solution, heat in a water bath to 100°C, and stir fully at this temperature, react for 30min, and filter with ethanol precipitation , Repeat the operation three times, the filter residue is the product, and at the same time dry at 60°C for 12 hours, and then put the grafted solids obtained after drying into the desiccator to balance for 5 hours. The experimental results are shown in Table 3.

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Abstract

The invention relates to a preparation method of a beta-cyclodextrin modified starch material, and an adsorption property of the beta-cyclodextrin modified starch material on a dye. The process technology is simpler and novel, the cyclodextrin content of the obtained cyclodextrin modified starch material is higher, an adsorption effect on the dye is better, the removal rate of the dye can reach up to 86.0618 percent maximally, and the adsorption effect of the beta-cyclodextrin modified starch material is superior to the adsorption effect of a common adsorption agent such as corn starch, activated carbon and zeolite. The cyclodextrin modified starch material is naturally degradable, free of toxic and side effects, green and environment-friendly, high in safety and the like.

Description

technical field [0001] The invention relates to the technical field of β-cyclodextrin immobilized cornstarch, in particular to a process for preparing β-cyclodextrin immobilized starch with relatively high cyclodextrin content, and using it as a green natural chemical dye for adsorption agent, used in the field of textile printing and dyeing wastewater. Background technique [0002] my country is the most populous country in the world, and it is also one of the 13 countries in the world where per capita water resources are scarce, accounting for only 1 / 4 of the global average level. Large areas of water bodies in my country are subject to industrial and domestic pollution to varying degrees, and a large amount of industrial wastewater cannot be effectively treated, recycled, and the reuse rate is low, which seriously hinders the sustainable development of my country's economy (see Shen Xiangyu. Starch and fiber solids Synthesis and characterization of β-cyclodextrin polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/30C02F101/36C02F101/38
CPCB01J20/22B01J20/24B01J20/265B01J2220/4825C02F1/285C02F2101/308C02F2101/36C02F2101/38
Inventor 王建坤江薇郭晶张昊范新宇
Owner TIANJIN POLYTECHNIC UNIV
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