Magnetic polyacrylamide/zirconium alginate gel beads as well as preparation method and application thereof

A technology of zirconium alginate gel balls and polyacrylamide, which is applied in chemical instruments and methods, magnetic/electric field water/sewage treatment, and other chemical processes, and can solve poor adsorption capacity and stability, difficult separation and recovery, and phosphorus resources. Recycling and other issues, to achieve the effect of improving adsorption performance, low price, and high adsorption performance

Active Publication Date: 2017-12-08
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an alginic acid type dephosphorization adsorbent with high adsorption capacity, high mechanical strength, and easy recycling and reuse for the problems of poor adsorption capacity and stability and difficult separation and recovery of the existing alginic acid-type phosphorus removal adsorbent. Magnetic interpenetrating network polyacrylamide / zirconium alginate gel spheres (Fe 3 o 4 The preparation method of @PAM / SA-Zr) to solve the increasingly serious phosphorus pollution and phosphorus resource recovery in water bodies

Method used

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  • Magnetic polyacrylamide/zirconium alginate gel beads as well as preparation method and application thereof
  • Magnetic polyacrylamide/zirconium alginate gel beads as well as preparation method and application thereof
  • Magnetic polyacrylamide/zirconium alginate gel beads as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Magnetic polyacrylamide / zirconium alginate (Fe 3 o 4 Preparation method and characterization results of @PAM / SA-Zr) gel ball adsorbent

[0035] Step (1): Weigh 0.42g FeCl 3 ·6H 2 O and 0.218g FeSO 4 ·7H 2 O was dissolved in 300mL deionized water, placed in a four-neck flask, N 2 After stirring mechanically for 30min under protection, add 600μL 10mol / L NaOH solution, 2 Stirring was continued for 1 hour under protection; at the same time, the water temperature was rapidly raised to 90°C, and 300 mL of sodium citrate solution (0.3 mol / L) was started to be added dropwise. More than three times, and finally re-disperse the obtained product in deionized water, ultrasonically form a stable nano-magnetic fluid, and set the volume to 50mL.

[0036] Step (2): Dissolve 1 g of sodium alginate in the magnetic fluid solution of step (1) at room temperature, stir at 450 rpm for 6 h until uniform, then add 3.84 g of acrylamide, 0.4164 g of N,N'-methylene Base bisacrylamide and ...

Embodiment 2

[0042] Contact time vs. Fe 3 o 4 Study on the influence of @PAM / SA-Zr on the adsorption performance of phosphate in water

[0043] In the present invention, the prepared magnetic Fe 3 o 4 @PAM / SA-Zr gel spheres were used in the adsorption of phosphate in water to investigate the effect of contact time on Fe 3 o 4 Effect of @PAM / SA-Zr adsorption performance. Ammonium molybdate spectrophotometry is used to measure the concentration of phosphate in water before and after adsorption, and its adsorption capacity is calculated respectively with formula (1):

[0044]

[0045] Among them, q t is the average adsorption capacity per unit mass of adsorbent within t time, mg-P / g; C o is the concentration of phosphate in the solution before adsorption, mg / L; C t is the concentration of phosphate in the solution after the adsorption time t, mg / L; V is the volume of the phosphate solution, L; m is the mass of the adsorbent, g.

[0046] The experimental conditions for the influenc...

Embodiment 3

[0048] Fe 3 o 4 Adsorption study of @PAM / SA-Zr for different initial concentrations of phosphate in water

[0049] Prepare different concentrations of phosphate solutions (10, 25, 50, 75, 100, 125, 150mg / L), adjust the pH of the solution=2, get each 20mL of the above-mentioned solutions of different concentrations, add the Fe prepared by the above-mentioned implementation cases 3 o 4 Each 0.05g of @PAM / SA-Zr gel balls was taken out after constant temperature shaking at 25°C for 30 hours, and the adsorption capacity was determined according to the formula (1). The calculation results are shown in Image 6 . It can be seen that the adsorption capacity of the prepared gel spheres increases with the increase of the initial phosphate concentration, which may be due to the increase of the phosphate concentration in the system, which increases the coordination probability of the phosphate radical and the binding site of the adsorbent. leading to an improvement in adsorption perfo...

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Abstract

The invention relates to a method for preparing magnetic polyacrylamide / zirconium alginate gel beads. The method comprises the following steps: preparing a hydrophilic Fe3O4 nano-magnetic fluid by using a co-precipitation method; adding sodium alginate into the hydrophilic Fe3O4 nano-magnetic fluid, and preparing into a precursor solution of magnetic composite gel with multiple organic solvents; preparing a mixed solution of zirconium oxychloride and ammonium persulfate; and uniformly dropping the obtained gel precursor solution into the mixed solution, and carrying out a chemical cross-linking reaction, thereby obtaining the magnetic polyacrylamide / zirconium alginate gel beads. The adsorption capacity of the material on phosphate in water reaches 42.21mg-P / g, even if the material is recycled for 5 times, the adsorption capacity is basically maintained invariable, and the material has excellent stability and recycling characteristics. The method is simple in preparation process, easily controllable in conditions and suitable for large-scale production. Particularly, due to magnetic responsiveness, the magnetic polyacrylamide / zirconium alginate gel beads can be rapidly separated and recycled in an applied magnetic field and have the characteristics of being high in efficiency, energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the field of water treatment, and more specifically relates to a preparation method of magnetic polyacrylamide / zirconium alginate gel balls. Background technique [0002] In recent years, the problem of water eutrophication caused by phosphorus-containing wastewater in the process of industrial and agricultural development in my country has become increasingly serious. With the decreasing of limited phosphorus resources in nature, phosphorus in wastewater is an important resource for agricultural fertilizer production. Therefore, it is imminent to find an economical and efficient technology for the effective removal and recovery of phosphorus in wastewater. At present, many wastewater phosphorus removal technologies have been developed, including chemical precipitation, biological, electrodialysis, reverse osmosis, ion exchange, and adsorption. Because the adsorption method has the advantages of small equipment investment, sim...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/48
CPCB01J20/06B01J20/24B01J20/26B01J20/28009B01J20/28019B01J20/28047C02F1/281C02F1/285C02F1/286C02F1/288C02F1/488
Inventor 荣宏伟骆华勇曾学阳张耀坤曾子君
Owner GUANGZHOU UNIVERSITY
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