Fe3O4@SiO2 composite material adsorbent preparation method and application

A composite material and adsorbent technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, alkali metal compounds, etc., to achieve strong magnetic separation ability, wide application range, and avoid the effect of salinity ion interference

Inactive Publication Date: 2012-06-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the corresponding adsorbent not only cross-links and fixes xanthan gum molecules through the polymerization process, but also retains the chemical adso...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Synthesis of paramagnetic ferroferric oxide paramagnetic nanoparticles by chemical co-precipitation method:

[0026] The first step: synthesis of paramagnetic ferroferric oxide paramagnetic nanoparticles: In two 100mL beakers, add 7.95g FeCl respectively 2 ·4H 2 O green crystals and 18.91g FeCl 3 ·6H 2 O yellow crystals, and then dissolve them with an appropriate amount of secondary deionized water to prepare a solution with a concentration of 0.5 mol / L. FeCl after cooling 2 And FeCl 3 The mixed solution was mixed in a three-necked flask to obtain a brown-red oily solution. The filtered FeCl 2 And FeCl 3 The mixed solution was moved into a constant temperature tank with a temperature of 65°C, and ammonia was added dropwise. After the ammonia was added, it was observed that the solution turned brown. At the same time, it was stirred with a stirrer to make it evenly dispersed without agglomeration to form large particles. Until the solution suddenly becomes jet black, co...

Embodiment 2

[0029] The Fe synthesized in step (1) in Example 1 3 O 4 The magnetic microspheres are repeatedly washed with deionized water to remove water-soluble impurities, and finally the product is dried at 60°C to obtain black powder. Take 20mL ethyl orthosilicate, 20ml deionized water, 100μL concentrated hydrochloric acid (volume ratio ethyl orthosilicate: H 2 O: concentrated HCl=200:200:1), in a 100mL polytetrafluoroethylene beaker, use ammonia water to control the pH to 2, and add dry Fe to it 3 O 4 Magnetic microsphere 2.4g, ultrasonic (power 50W) dispersion for 1h, then add 50mL 2% (m / v) xanthan gum solution, ultrasonic dispersion for 1h, put the above beaker in a 60℃ oven, use a glass rod Stir intermittently and dry for later use.

Embodiment 3

[0031] The Fe synthesized in step (1) in Example 1 3 O 4 The magnetic microspheres are repeatedly washed with deionized water to remove water-soluble impurities, and finally the product is dried at 60°C to obtain black powder. Take 40ml ethyl orthosilicate, 40ml deionized water, 200μL concentrated hydrochloric acid (volume ratio ethyl orthosilicate: H 2 O: concentrated HCl=200:200:1), in a 100mL polytetrafluoroethylene beaker, use ammonia water to control the pH to 2, and add dry Fe to it 3 O 4 Magnetic microsphere 2.4g, ultrasonic (power 50W) dispersion for 1h, then add 50mL 2% (m / v) xanthan gum solution, ultrasonic dispersion for 1h, put the above beaker in a 60℃ oven, use a glass rod Stir intermittently and dry for later use.

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Abstract

The invention discloses a Fe3O4@SiO2 composite material adsorbent preparation method and application. The method comprises the following steps of: synthesizing ferroferric oxide magnetic micro-spheres by using a chemical co-precipitation method; wrapping silicon dioxide on the surfaces of the ferroferric oxide magnetic micro-spheres by using a sol-gel method; and fixing xanthan gum molecules on the surfaces of the magnetic micro-spheres in a functionalized way to prepare an adsorbent. The adsorbent has large specific surface area under nanoscale, high magnetic separation capacity and good stability due to the wrapped silicon dioxide shell layer, rich active adsorption sites are introduced by the xanthan gum molecules in the functionalized way; the Pb adsorption efficiency is over 90 percent. The adsorbent enriches and separates Pb-containing artificial simulate seawater and is subsequently combined with a graphite furnace atomic absorption spectrometry to measure total lead concentration, so that interference of salinity ions in the background of a seawater sample can be effectively avoided, and a standard curve is satisfactory; the lead concentration in the actual seawater is correspondingly tested, and the recovery rate reaches 85.71 percent.

Description

Technical field [0001] The invention relates to the technical field of analysis and testing instruments, in particular to a xanthan gum functionalized Fe 3 O 4 SiO 2 Preparation method and application of composite adsorbent. Background technique [0002] Despite the continuous development of modern analytical testing instruments, they are becoming simpler and faster, but due to the relative backwardness of the corresponding pre-processing technology, it has become a bottleneck restricting the relevant analytical field. For most actual complex sample systems, the target analyte needs to be enriched and separated to remove possible interfering substances to meet the detection requirements of relevant analytical instruments. As we all know, the adsorption separation method has the advantages of simplification of operating equipment, easy realization of automatic control, and low cost. At present, how to develop a new type of adsorbent with abundant functional sites, easy to separat...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 徐芳苏彦文彭晓丽张珊张闻中陈微微刘志高陈建刚
Owner SHANGHAI JIAO TONG UNIV
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