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Preparation method of diatomite-surface As (III) ion imprinting adsorbing material

An adsorption material, ion imprinting technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc. Deep and other problems, to achieve the effect of high selectivity, low cost and high recognition

Inactive Publication Date: 2019-09-06
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a simple device and strong applicability, but there are still some problems: (1) template ions are embedded too deeply and are not easy to elute; (2) the distribution of imprinted sites is uneven, and the mass transfer rate decreases; (3) grinding Destruction of imprinted sites, template ion selectivity decreased

Method used

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  • Preparation method of diatomite-surface As (III) ion imprinting adsorbing material
  • Preparation method of diatomite-surface As (III) ion imprinting adsorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Pre-adsorption: Mix chitosan, sodium arsenite, and methanol aqueous solution at a ratio of 1:0.03:2 (g / g / L), adjust the pH of the mixture to 4.0 with acetic acid, and disperse evenly by ultrasonication. Magnetically stirred at 300 rpm for 30 min to prepare an As(III) adsorption solution.

[0017] (2) Cross-linking polymerization: diatomaceous earth, γ-(2,3-glycidoxy) propyltrimethoxysilane and epichlorohydrin in a ratio of 1:2:0.4 (g / mL / mL ) into the As(Ⅲ) adsorption solution prepared in step (1) in turn, and stirred at 400rpm in a constant temperature water bath at 70°C for 12h, took it out and cooled it, and washed off the composite The unreacted matter on the surface of the object was filtered to obtain a complex.

[0018] (3) Drying-elution-drying: The complex prepared in step (2) was vacuum-dried at 60°C for 12 hours. After taking it out, the complex was eluted with 0.5mol / L sodium hydroxide aqueous solution until the eluent As(Ⅲ) was not detected, filtered, ...

Embodiment 2

[0024] (1) Pre-adsorption: Mix chitosan, sodium arsenite, and methanol aqueous solution at a ratio of 1:0.04:2.5 (g / g / L), adjust the pH value of the mixture to 5.0 with acetic acid, and disperse evenly by ultrasonication. Under 350rpm magnetic stirring for 30min, the As(Ⅲ) adsorption solution was obtained.

[0025] (2) Cross-linking polymerization: diatomaceous earth, γ-(2,3-glycidoxy) propyltrimethoxysilane and epichlorohydrin in a ratio of 1:2:0.4 (g / mL / mL ) into the As(Ⅲ) adsorption solution prepared in step (1) in turn, and stirred at 450rpm in a constant temperature water bath at 70°C for 15h, took it out and cooled it, and washed off the composite The unreacted substance on the surface of the substance is filtered to obtain the complex.

[0026] (3) Drying-elution-drying: The complex prepared in step (2) was vacuum-dried at 60°C for 12 hours. After taking it out, the complex was eluted with 0.5mol / L sodium hydroxide aqueous solution until the eluent As (Ⅲ) was not dete...

Embodiment 3

[0032] (1) Pre-adsorption: Mix chitosan, sodium arsenite and methanol / water at a ratio of 1:0.06:2.5 (g / g / L), adjust the pH value of the mixture to 5.5 with acetic acid, and disperse evenly by ultrasonication. Magnetically stirred at 400 rpm for 30 min at room temperature to obtain an As(III) adsorption solution.

[0033] (2) Cross-linking polymerization: diatomaceous earth, γ-(2,3-glycidoxy) propyltrimethoxysilane and epichlorohydrin in a ratio of 1:2:0.4 (g / mL / mL ) into the As(Ⅲ) adsorption solution prepared in step (1) in turn, and stirred in a constant temperature water bath at 70°C at 500rpm for 18h, took it out and cooled it, and washed off the complex with a methanol / water mixture with a volume ratio of 1:1 The unreacted substance on the surface of the substance is filtered to obtain the complex.

[0034] (3) Drying-elution-drying: The complex prepared in step (2) was vacuum-dried at 60°C for 12 hours. After taking it out, the complex was eluted with 0.5mol / L sodium hy...

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Abstract

The invention discloses a preparation method of a diatomite-surface As (III) ion imprinting adsorbing material. The method comprises the steps that by adopting a pre-adsorption-post-crosslinking polymerization surface imprinting method, chitosan pre-adsorbs As (III) ions, then diatomite, gamma-(2,3-epoxypropoxy) propyltrimethoxysilicane and epoxy chloropropane are added in sequence for a crosslinking polymerization reaction for 12-18 hours, drying, elution and drying are carried out, and the diatomite-surface As (III) ion imprinting adsorbing material is prepared and can be used for selectiveremoval of the As (III) ions in an aqueous solution. The prepared diatomite-surface As (III) ion imprinting adsorbing material is low in cost and environmentally friendly, and has high selectivity andhigh identifiability for template ions.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a preparation method of an As(III) ion imprinted adsorption material on the surface of diatomite. Background technique [0002] As(Ⅲ) ion has high toxicity, and it is easy to produce enrichment effect on aquatic organisms and human body, leading to the "three hazards" of teratogenicity, carcinogenicity and mutagenicity. Most of the traditional treatment methods use adsorption, which has the advantages of low cost and simple operation, but lacks pertinence and blindness to target ions. Therefore, it is particularly important to research and develop an adsorption material that can selectively separate target ions. [0003] Ion imprinting technology is currently one of the main methods for preparing highly selective materials. The traditional preparation method of imprinted materials is to dissolve template ions, functional monom...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/268B01J20/28011C02F1/285C02F2101/103
Inventor 杨勤桃解庆林陈南春代俊峰曾鸿鹄梁延鹏
Owner GUILIN UNIVERSITY OF TECHNOLOGY