A preparing method of a magnetic hydrogel microsphere

A technology of gel microspheres and magnetic water, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as difficult large-scale production, low adsorption rate, and low preparation efficiency, and achieve easy scale efficient production, easy separation, and improved adsorption efficiency

Inactive Publication Date: 2017-03-15
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the problem of low adsorption rate has not been well solved
In addition, the above-mentioned hydroge

Method used

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  • A preparing method of a magnetic hydrogel microsphere
  • A preparing method of a magnetic hydrogel microsphere

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) Ultrasonic dispersion of 0.5 g of graphite oxide prepared by the Hummers method in 100 mL of deionized water to obtain a GO dispersion with a concentration of 5 mg / mL. Then, under a nitrogen atmosphere, 1.5 g of iron salt (Fe 2+ and Fe 3+ The molar ratio is 1:2) and 0.2g NaOH solution for 30 min to get GO@Fe 3 o 4 The mixture was centrifuged and dried for use.

[0022] (2) Dissolve 5 g of CMC in 500 mL of distilled water at 60 °C, and then add 0.435 g of GO@Fe into it 3 o 4 and 0.2 g of citric acid, ultrasonically dispersed and magnetically stirred for 3 h, and then prepared GO@Fe by spray dryer 3 o 4 CMC composite microspheres with 8wt% content, marked as CMC / GO@Fe 3 o 4 . The parameters of the spray drying device are set to an inlet temperature of 150-160 °C, an injection volume of 600-800 mL / h, and an air flow rate of 80-90%. Finally, the obtained composite microspheres were dried in an oven at 90 °C for 5 h and then sealed for use.

[0023] In addit...

Embodiment 2

[0026] In Example 2, CMC / GO@Fe was prepared in the same manner as in Example 1 3 o 4 Composite hydrogel microspheres, the only difference is the GO@Fe composite microspheres in this example 3 o 4 The content is 2 wt%. The results showed that the adsorption capacity of the hydrogel microspheres in this example to hexavalent chromium ions was 9 mg / g at pH=4.

Embodiment 3

[0028] In Example 3, CMC / GO@Fe was prepared in the same manner as in Example 1 3 o 4 Composite hydrogel microspheres, the only difference is the GO@Fe composite microspheres in this example 3 o 4The content is 4 wt%. The results showed that the adsorption capacity of the hydrogel microspheres in this example to hexavalent chromium ions was 17 mg / g at pH=4.

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Abstract

The invention discloses a preparing method of a magnetic hydrogel microsphere, and belongs to the field of sewage treatment. The method includes firstly preparing graphene oxide (GO@Fe<3>O4) loaded with Fe<3>O4 magnetic nanometer particles through a coprecipitation process, mixing the GO@Fe<3>O4 with a water soluble polymer (such as sodium carboxymethylcellulose (CMC)), and preparing the magnetic composite hydrogel microsphere (such as CMC/GO@ Fe<3>O4) through a spray drying process. The prepared composite hydrogel microsphere has good swelling properties and a large specific surface area. The adsorption efficiency for pollutants is increased, and pollutant adsorption varieties and adsorption amounts of hydrogel are increased. The composite hydrogel microsphere is easy to separate, and can be adopted as adsorbents for organic dye and heavy metal ions in industrial waste water.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for preparing magnetic graphene-based composite hydrogel microspheres. Background technique [0002] Industrial wastewater contains a large number of pollutants such as heavy metal ions and organic dyes, and its treatment has become a research hotspot in recent years. Compared with traditional treatment methods such as electrodeposition and filtration, physical adsorption has the advantages of low cost, simple operation, and no secondary pollution. However, traditional adsorption materials including activated carbon, wood chips, coal cinders, and volcanic ash generally have the disadvantages of low adsorption efficiency, poor selective adsorption, and difficulty in recycling. The porous structure inside the hydrogel endows it with a huge specific surface area, which can provide a large number of attachment sites for pollutant adsorption. Therefore, it is regarded as a g...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/28009B01J20/28047B01J2220/4825C02F1/286C02F2101/22C02F2101/308
Inventor 魏宏亮刘静静楚晖娟何娟朱靖
Owner HENAN UNIVERSITY OF TECHNOLOGY
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