Preparation method for modified kieselguhr composite adsorbing material

A composite adsorption material, diatomite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as low adsorption capacity, inability to effectively remove dyes from printing and dyeing wastewater, and achieve strong adsorption capacity , the effect of large specific surface area

Inactive Publication Date: 2012-08-22
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the low adsorption capacity of natural diatomite minerals is common, and the dyes in printing and d

Method used

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  • Preparation method for modified kieselguhr composite adsorbing material
  • Preparation method for modified kieselguhr composite adsorbing material
  • Preparation method for modified kieselguhr composite adsorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) At 25°C, add 1.00g chitosan to 50mL 0.2mol / L ferric chloride solution, stir well until the chitosan is completely dissolved and a sol is formed, then add 2.0g diatom under stirring soil, continue to stir for 2 hours at 25°C;

[0028] 2) Then add 100mL ethanol to obtain a solid precipitate, filter, wash with ethanol, dry and grind into powder;

[0029] 3) At 25°C, add the product obtained in the previous step into the ethanol solution of glutaraldehyde (the concentration of glutaraldehyde is 3vol%), keep stirring for 4 hours to cause cross-linking reaction, filter, wash with ethanol, and dry The desired modified diatomite composite adsorbent is obtained, and the material can be used for dye adsorption.

Embodiment 2

[0031] 1) At 25°C, add 1.00g of chitosan to 50mL of 0.22mol / L ferric chloride solution and stir well until the chitosan is completely dissolved and a sol is formed, then add 0.5g of diatomaceous earth under stirring , continue to stir for 2h at 25°C;

[0032] 2) Then add 120mL ethanol to obtain a solid precipitate, filter, wash with ethanol, dry and grind into powder;

[0033] 3) At 25°C, add the product obtained in the previous step into an ethanol solution of glutaraldehyde (the concentration of glutaraldehyde is 7vol%), keep stirring for 4 hours to cause a cross-linking reaction, filter, wash with ethanol, and dry The desired modified diatomite composite adsorbent is obtained, and the material can be used for dye adsorption.

[0034] The application effect of the modified diatomite composite adsorption material prepared by the present invention is illustrated below in conjunction with specific application examples:

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Abstract

The invention discloses a preparation method for a modified kieselguhr composite adsorbing material. The method comprises the following steps of: 1) dissolving chitosan in the solution of a trivalent ferric salt, adding kieselguhr into the solution, and uniformly mixing the materials; 2) adding ethanol into the mixture to obtain a sediment, and filtering, washing and drying the sediment; and 3) adding the product obtained in the step 2) into the solution of ethanol of glutaraldehyde to be subjected to cross-linking reaction, and filtering, washing and drying the sediment. The preparation method has the beneficial effect that the kieselguhr prepared by the method is large in specific surface area and high in adsorption capacity. A dynamic absorbing experiment on Congo red shows that the highest adsorbing capacity of a composite material can be up to 1,250mg/g and the time for the balance of adsorption is not more than 10min.

Description

technical field [0001] The invention relates to a preparation method of a modified diatomite composite adsorption material. Background technique [0002] It is estimated that there are more than 100,000 commercially available dyes worldwide, and the discharge of dye wastewater exceeds 700,000 tons per year. Many dyes are toxic or even carcinogenic, posing a serious threat to aquatic organisms. Moreover, since dyes are refractory organic compounds with complex chemical structures, bacteria in conventional activated sludge cannot engulf and destroy them. Common biochemical treatment often makes the effluent unstable and difficult to meet discharge standards. Physical and chemical methods, such as: electrolytic coagulation method, chemical oxidation method, photocatalytic method, air flotation method, etc. Although these methods have relatively good treatment effects, they have strict operating conditions, poor stability, and high cost, making it difficult to promote and implem...

Claims

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Application Information

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IPC IPC(8): B01J20/14B01J20/30C02F1/28
Inventor 李来胜王承刚潘兆琪舒月红李旭凯严惠华
Owner SOUTH CHINA NORMAL UNIVERSITY
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