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CD (cyclodextrin) modified starch dye adsorbent and preparation method thereof

A cyclodextrin and adsorbent technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of complex operation, pollution, and low adsorption efficiency, and achieve simple preparation process and high adsorption effect Good, convenient and easy to implement effect

Inactive Publication Date: 2018-12-14
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, the dye has a stable structure and bright colors, and it dissolves into water, soil, atmosphere or living environment, causing sensory pollution to people.
And many dyes or their degradation products are biologically toxic, can cause cancer, teratogenicity and even induce gene mutations. These toxic substances will directly cause harm to the human body through the food chain. Therefore, the removal of dye molecules in water is of great significance to protect the environment.
[0004] At present, there are many methods used in printing and dyeing wastewater treatment, such as membrane separation, microbial degradation, adsorption, radiation, precipitation, flocculation, redox, biological treatment, solvent extraction, etc., but there are still various Defects, complex operation, or high cost, secondary pollution caused by input of treatment agent in the process of treatment, low adsorption efficiency, etc.

Method used

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  • CD (cyclodextrin) modified starch dye adsorbent and preparation method thereof
  • CD (cyclodextrin) modified starch dye adsorbent and preparation method thereof
  • CD (cyclodextrin) modified starch dye adsorbent and preparation method thereof

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preparation example Construction

[0026] The present invention simultaneously designs the preparation method (abbreviation preparation method) of β-cyclodextrin-loaded starch, which adopts the composition and process steps of the raw material mass fraction of β-cyclodextrin-loaded starch of the present invention: native starch 100 parts; 234 parts of β-cyclodextrin; 400 parts of distilled water, 20 parts of citric acid, 5 parts of sodium hypophosphite.

[0027] (1) Make a suspension from the above-mentioned portions of cornstarch, β-cyclodextrin and distilled water, transfer to a three-necked flask, and gelatinize by heating in a water bath at 85° C. for 30 minutes. Then add 20 parts of distilled water containing said parts of citric acid and sodium hypophosphite, and stir evenly. The mixture was moved into an oven at 120°C and reacted for 2h.

[0028] (2) After the reaction, it was taken out and pulverized, washed three times with 40% ethanol, and centrifuged to dry to obtain the sample β-cyclodextrin immobi...

Embodiment 1

[0037] (1) Make a suspension from 50g of cornstarch, 117g of β-cyclodextrin and 200mL of distilled water, transfer it to a three-neck flask, and heat it in a water bath at 85°C for 30min to gelatinize. Then add 100 mL of distilled water containing 10 g of citric acid and 2.5 g of sodium hypophosphite, and stir well. The mixture was moved into an oven at 120°C and reacted for 2h.

[0038] (2) After the reaction, it was taken out and pulverized, washed three times with 40% ethanol, and centrifuged to dry to obtain the sample β-cyclodextrin immobilized starch, ie CS-βCD.

[0039] Immobilization effect test: Refer to the measurement method of CS-βCD substitution degree in the previous section to determine relevant parameters. The calculated substitution degree and carboxyl content data in this example are listed in Table 1, and the structural characterization can be found in figure 1 , figure 2 and image 3 .

Embodiment 2

[0041] (1) Make a suspension from 50g of cornstarch, 117g of β-cyclodextrin and 200mL of distilled water, transfer it to a three-neck flask, and heat it in a water bath at 85°C for 30min to gelatinize. Then add 100 mL of distilled water containing 10 g of citric acid and 2.5 g of sodium hypophosphite, and stir well. The mixture was moved into an oven at 130°C and reacted for 2h.

[0042] (2) After the reaction, it was taken out and pulverized, washed three times with 40% ethanol, and centrifuged to dry to obtain the sample β-cyclodextrin immobilized starch, ie CS-βCD.

[0043] The calculated immobilization rate of this embodiment is listed in Table 1.

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Abstract

The invention discloses a natural polymer adsorbent beta-CD (cyclodextrin) immobilized starch (CS-beta CD). The adsorbent is characterized in that the starch comprises raw materials in parts by mass as follows: 100 parts of native starch, 234 parts of beta-CD, 400 parts of distilled water, 20 parts of citric acid and 5 parts of sodium hypophosphite. The invention also provides a preparation methodof the starch. The method adopts the raw material mass composition of the beta-CD immobilized starch and comprises the following process steps: (1) a suspension is prepared from 100 parts of corn starch, 234 parts of beta-CD and 400 parts of the distilled water, transferred into a three-neck flask and then heated and gelatinized for 30 min in a water bath at 85 DEG C; then 20 parts of the distilled water, 20 parts of citric acid and 5 parts of sodium hypophosphite are added, and the substances are stirred uniformly; the obtained mixture is transferred into a drying oven at 120 DEG C and subjected to a reaction for 2 h; (2) after the reaction, a product is taken out, crushed, washed three times with 40% ethanol and dried centrifugally, and the sample beta-CD immobilized starch, namely, CS-beta CD is obtained.

Description

[0001] A method for preparing and using a β-cyclodextrin-immobilized starch (CS-βCD) dye adsorbent. technical field [0002] The invention relates to the application of modified natural starch in the purification of printing and dyeing wastewater, belonging to the technical field of textile materials. Background technique [0003] With the rapid development of the textile and printing and dyeing industries, the pollution caused by a large amount of wastewater discharge is becoming more and more serious. Printing and dyeing industrial wastewater has the characteristics of complex components, often containing a variety of dyes, deep chroma, strong toxicity, refractory degradation, large pH fluctuations, high concentration, and large water volume. It is one of the most difficult industrial wastewater to treat. Secondly, the dye has a stable structure and bright colors, and it dissolves into water, soil, atmosphere or living environment, causing sensory pollution to people. And...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30C02F103/30
CPCB01J20/24C02F1/286C02F2101/308C02F2103/30
Inventor 张昊李雅兴张毅李帆孙侨曼
Owner TIANJIN POLYTECHNIC UNIV
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