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 t

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

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

[0035] Step (1): Weigh 0.42g FeCl 3 ·6H 2 O and 0.218g FeSO 4 ·7H 2 O was dissolved in 300 mL of deionized water, placed in a four-necked flask, N 2 After mechanical stirring for 30 min under the protection, 600 μL of 10 mol / L NaOH solution was added, under N 2 Continue stirring for 1 h under the 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 added dropwise. The reaction time continued for 1 h and then cooled to room temperature. The precipitate was separated with a magnet and washed with water. Repeated More than three times, finally, the obtained product was redispersed in deionized water, ultrasonicated to form a stable nano-magnetic fluid, and the volume was adjusted to 50 mL.

[0036] Step (2): at room temperature,...

Example Embodiment

[0041] Example 2

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

[0043] The magnetic Fe prepared by the present invention 3 O 4 @PAM / SA-Zr gel spheres were used for the adsorption study of phosphate in water, and the effect of contact time on Fe was investigated 3 O 4 Effect of @PAM / SA-Zr adsorption performance. Use ammonium molybdate spectrophotometry to measure the concentration of phosphate in water before and after adsorption, and use formula (1) to calculate its adsorption amount respectively:

[0044]

[0045] where q t is the average adsorption capacity per unit mass of adsorbent in 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 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 e...

Example Embodiment

[0047] Example 3

[0048] Fe 3 O 4 Adsorption of phosphates with different initial concentrations in water using @PAM / SA-Zr

[0049] Prepare phosphate solutions of different concentrations (10, 25, 50, 75, 100, 125, 150 mg / L), adjust the pH of the solution to 2, take 20 mL of each of the above solutions of different concentrations, and add Fe prepared in the above example. 3 O 4 0.05g each of @PAM / SA-Zr gel spheres were shaken at a constant temperature of 25°C for 30h and taken out. The adsorption capacity was measured according to 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 phosphate and the binding site of the adsorbent. lead to an improvement in adsorption performance.

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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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