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Chitosan modified diatom-based As (V) ion imprinting material and preparation and application methods thereof

A technology of ion imprinting and chitosan, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as poor selective adsorption effect

Inactive Publication Date: 2019-02-22
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, silicon materials, carbon nanotubes, magnetic materials, alumina or titanium oxide, etc. are used as substrates. After surface modification or modification, surface ion imprinting technology is used to make the recognition sites located on the surface of the substrate or in the pores, thereby improving The combination speed and separation efficiency of template ions, but there is still the problem of poor selective adsorption of As(V) ions

Method used

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  • Chitosan modified diatom-based As (V) ion imprinting material and preparation and application methods thereof
  • Chitosan modified diatom-based As (V) ion imprinting material and preparation and application methods thereof
  • Chitosan modified diatom-based As (V) ion imprinting material and preparation and application methods thereof

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preparation example Construction

[0050] The present invention provides a kind of preparation method based on chitosan modified diatom As(V) ion imprinting material, comprising the following steps:

[0051] After mixing diatomite and methanesulfonic acid solution, activate it to obtain activated diatomite;

[0052] Chitosan, As(V) solution and HAc solution are mixed to obtain chitosan sol;

[0053] Mixing the activated diatomite, chitosan sol and γ-glycidyl etheroxypropyltrimethoxysilane for polymerization reaction to obtain a diatom-based cross-linked polymer;

[0054] The template ions in the diatom-based cross-linked polymer are eluted with hydrochloric acid solution to obtain an ion imprinted material based on chitosan-modified diatom As(V).

[0055] The invention mixes the diatomite (Dt) and methanesulfonic acid solution to activate to obtain the activated diatomite (At-Dt). In the present invention, the dosage ratio of diatomaceous earth and methanesulfonic acid solution is preferably 30g:100mL, and th...

Embodiment 1

[0082] (1) Preparation of activated diatomite (At-Dt)

[0083] Weigh 30g of diatomaceous earth (Dt) into a 500mL flask, add 100mL of 33% methanesulfonic acid solution, and heat to reflux at 50°C for 8h. After cooling, filter with suction, wash with ultrapure water until neutral, and dry the solid at 80°C to obtain activated diatomite.

[0084] (2) Preparation of IIP

[0085] 1.5g of chitosan (CS) was dispersed in 5mL of 2g / L As(V) solution (pH=5), and then 20mL of 2% HAc solution was added until the chitosan was dissolved, and then 5g of activated diatomaceous earth was added for 25 Stir magnetically at ℃ for 2 hours, add 5mL DGTMS, and stir until gelatinous under the same conditions; dry at 50℃, grind through a 100-mesh sieve, add 100mL of 0.5mol / L hydrochloric acid, stir at 25℃ for 2h, and filter with suction; Wash with ultrapure water until the supernatant is neutral and free of As, filter with suction, and dry at 50°C to obtain IIP.

[0086] (3) Preparation of NIP

[0...

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Abstract

The invention provides a preparation method of a chitosan modified diatom-based As (V) ion imprinting material (IIP) and belongs to the field of ion imprinting materials. The chitosan modified diatom-based As (V) ion imprinting material takes diatom surface modifying chitosan as carriers and functional monomers and gamma-glycidyloxypropyltrimethoxysilane as crosslinking agent to prepare an As (V)identifiable absorbent. Diatom has absorptive properties and a large quantity of electronegative active sites on the surface, thereby being high in plasticity; DGTMS molecules can be polycondensated with Si-OH on the surface of the diatom and meanwhile has epoxy groups applicable to reaction with -NH2 on chitosan molecules; through covalent bond connected crosslinking reaction between the DGTMS and amino of the chitosan molecules, the DGTMS can be hydrolyzed for self-condensation and hydro-condensated with the Si-OH groups on the surface of the diatom for covalent bond connection, and the epoxy groups are ring-opened and covalent-crosslinked with the amino of the chitosan to form a high-density net-structured polymer.

Description

technical field [0001] The invention relates to the technical field of ion imprinted materials, in particular to a chitosan-modified diatom As(V) ion imprinted material and its preparation method and application. Background technique [0002] With the development of industrial production, especially the rapid development of high-pollution industries such as mining and smelting, electroplating, battery, and pigment industries, a large amount of pollutants containing Cu, Pb, Zn, Cd, Hg, Cr, Ni, Sn, As are produced. Wastewater with other elements is discharged into water bodies, causing rivers, groundwater and soil in many areas to be polluted by heavy metals to varying degrees, posing a serious threat to the water resource environment and the entire ecosystem. [0003] The recycling of specific ions in water not only saves resources but also reduces environmental pollution. Therefore, the development and utilization of ion-selective adsorption process has become a hot spot. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28B01J20/30C02F101/10
CPCB01J20/268C02F1/285C02F2101/103
Inventor 马丽丽余清凤陈南春解庆林梁效铭李聪钟溢健
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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