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Gold ion imprinting magnetic adsorbent as well as preparation method and application thereof

A magnetic adsorbent, gold ion technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve the problems of uneven binding sites of materials, time-consuming and laborious repeated grinding, and difficult elution of internal templates. Achieve the effect of simple phase separation, easy batch operation and wide pH range

Inactive Publication Date: 2017-11-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface imprinting technology performs imprinting polymerization on the surface of a certain supporting substrate, and wraps IIP on the surface of the substrate, so that the binding sites are fixed on the surface with good accessibility. The imprinted materials prepared overcome the traditional bulk polymerization. A series of shortcomings such as heterogeneous binding sites, poor surface accessibility, slow recognition kinetics, long extraction time, difficult elution of internal templates, and time-consuming and laborious grinding repeatedly

Method used

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  • Gold ion imprinting magnetic adsorbent as well as preparation method and application thereof
  • Gold ion imprinting magnetic adsorbent as well as preparation method and application thereof
  • Gold ion imprinting magnetic adsorbent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of gold ion imprinted magnetic adsorbent MNPs@PVIM-Au-IIP (ie MNPs@IIP)

[0040] The schematic diagram of the synthesis of gold ion imprinted magnetic adsorbent MNPs@PVIM-Au-IIP is shown in figure 1 As shown, the specific steps are as follows:

[0041] Step 1. Co-precipitation method to prepare magnetic Fe with a particle size of 10-20nm 3 o 4 Nanoparticles: Dissolve 11.68g of ferric chloride and 4.30g of ferrous chloride in 200mL of high-purity water, stir and heat to 85°C under nitrogen protection. Then add 20 mL of 30% NH 3 ·H 2 O, the color of the solution rapidly changed from orange to black. After reacting for half an hour, the reaction was stopped, cooled to room temperature, and the obtained nanoparticles were washed with high-purity water and ethanol in turn until neutral, and stored with high-purity water.

[0042] Step 2. Preparation of Fe with Core-Shell Structure by Silica Coupling 3 o 4 @SiO 2 @MPS Magnetic Nanoparticles (abbreviate...

Embodiment 2

[0046] Preparation of Non Imprinted Polymercoated Magnetic Adsorbent MNPs@NIP (Non Imprinted Polymercoated MNPs)

[0047] Preparation of non-imprinted polymer-coated magnetic adsorbent MNPs@NIP: The difference from Example 1 is that no chloroauric acid solution is added, and there is no need to use thiourea-HCl solution for ultrasonic cleaning to remove template ions. Other synthesis methods and The conditions are the same as the preparation method of MNPs@IIP in Example 1.

Embodiment 3

[0048] Characterization of MNPs, MNPs@IIP and MNPs@NIP

[0049] The MNPs, MNPs@IIP prepared in Example 1 and the MNPs@NIP prepared in Example 2 were characterized by FT-IR spectrometer. Such as figure 2 As shown, in the infrared spectra of MNPs, MNPs@IIP and MNPs@NIP, a wavenumber of 570cm -1 left and right and 1085cm -1 The left and right absorption peaks are respectively the stretching vibration peak of the Fe-O bond and the characteristic absorption peak of the Si-O bond, indicating that the material contains magnetic Fe 3 o 4 composition, and the surface is successfully coated with SiO 2 Silicone coating. In the infrared spectrum of MNPs ( figure 2 In the middle a curve), a C=C double bond (1630cm -1 ) and C=O double bond (1701cm -1 ) characteristic absorption peak, indicating that in Fe 3 o 4 @SiO 2 Surface modification of MPS was successful. In MNPs@NIP( figure 2 Middle b curve) and MNPs@IIP ( figure 2 In the infrared spectrogram of the middle c curve)...

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Abstract

The invention provides a gold ion imprinting magnetic adsorbent as well as a preparation method and application thereof. The adsorbent is prepared from a magnetic Fe3O4 core, a SiO2 layer, an MPS coating layer and a PVIM modified IIP coating layer, wherein the outside of the magnetic Fe3O4 core is sequentially wrapped by the SiO2 layer, the MPS coating layer and the PVIM modified IIP coating layer, and the IIP coating layer is in bond connection with imidazolyl. The preparation method of the adsorbent comprises the following steps: utilizing a magnetic Fe3O4 nano particle as the core and preparing Fe3O4SiO2MPS with a core-shell structure by utilizing a silica gel coupling method and utilizing TEOS and MPS as coupling agents; triggering polymerization reaction by utilizing a surface imprinting technology and combining free radical, utilizing Au(III) as a formwork ion, VIM as a functional monomer, EGDMA as a cross-linking agent and AIBN as an initiator, and synthesizing PVIM functionalized PVIM-Au-IIP on the surface of the MNPs to obtain a magnetic material coated with the IIP coating layer; utilizing an HCl solution containing thiourea to clean the material and removing the formwork ion to obtain the gold ion imprinting magnetic adsorbent. The synthesis sketch map of the adsorbent is shown in the description. The method can be used for simply and efficiently preparing the adsorbent which has high selectivity, high adsorption capacity and quick adsorption kinetic performance to Au(III), and the adsorbent has a good application prospect in the field of Au(III) adsorption.

Description

technical field [0001] The invention belongs to the field of separation and enrichment of precious metals, and in particular relates to a gold ion imprinted magnetic adsorbent and its preparation method and application. technical background [0002] Gold is an important precious metal, which is widely used in metallurgy, medicine, electronics industry, currency, jewelry, handicraft and other related manufacturing industries. However, the resource of gold is limited, its abundance in the earth's crust is low, and its concentration is usually 0.2-4.0ng g in environmental samples such as seawater, river water, soil, rock, etc. -1 Within range (Medved', J.; Bujdos, M.; Matus, P.; Kubova, J., "Determination of trace amounts of gold in acid-attacked environmental samples by atomic absorption spectrometry with electrothermalatomization after preconcentration", [J] Anal . Bioanal. Chem. 2004, 379(1), 60-65.). In order to facilitate the separation and enrichment of gold, the develo...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C22B3/24C22B11/00
CPCB01J20/268B01J20/28009C22B3/24C22B11/04Y02P10/20
Inventor 胡斌赵冰珊何蔓陈贝贝
Owner WUHAN UNIV
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