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Porous interpenetrating network poly N-isopropylacrylamide/zirconium alginate gel ball, and preparation method and application thereof

A technology of isopropyl acrylamide and zirconium alginate gel balls, applied in the field of water treatment, can solve problems such as poor adsorption capacity and stability, and achieve the effects of improving adsorption performance, high stability and reducing environmental pollution

Active Publication Date: 2018-01-12
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a porous interpenetrating network zirconium alginate gel ball and its preparation method for the problem of poor adsorption capacity and stability of alginic acid-type phosphorus removal materials

Method used

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  • Porous interpenetrating network poly N-isopropylacrylamide/zirconium alginate gel ball, and preparation method and application thereof
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  • Porous interpenetrating network poly N-isopropylacrylamide/zirconium alginate gel ball, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]A preparation method of porous interpenetrating network zirconium alginate gel balls with high efficiency adsorption of phosphate in water

[0036] Step (1) Dissolve 1g of sodium alginate (SA) in 50mL of deionized water at room temperature, stir at 450rpm for 6h until uniform, add 3.84g of N-isopropylacrylamide (NIPAM), 0.2616g of N, N'-methylenebisacrylamide (BIS) and 0.5mL N,N,N',N'-tetramethylethylenediamine (TEMED) and polyethylene glycol (PEG) (in this case PEG with NIPAM and The molar ratio of the sum of SA monomers is 1 / 2), mixing and stirring for 6-10 hours to remove air bubbles in the mixed solution, and the rotation speed is 450-600 rpm.

[0037] Step (2) Prepare 3% w / v CaCl 2 2H 2 A 500 mL mixed solution of O and 0.5% w / v ammonium persulfate (APS) was exposed to N 2 At least 30min to remove dissolved oxygen.

[0038] Step (3) Evenly drop the mixed solution obtained in step (1) into the mixed solution in step (2) through a constant pressure funnel, and alwa...

Embodiment 2

[0041] Structure and Properties of Porous Interpenetrating Network PNIPAM / SA-Zr

[0042] On the basis of not changing the raw materials, the porous interpenetrating network zirconium alginate gel balls with different porosities can be obtained by changing the content of the introduced porogen polyethylene glycol, so as to further control the adsorption effect. The content of polyethylene glycol (PEG) is 0 / 1, 1 / 8, 1 / 6, 1 / 4, 1 / 2.

[0043] The prepared porous interpenetrating network poly-N-isopropylacrylamide / zirconium alginate (PNIPAM / SA-Zr) gel balls with high-efficiency adsorption of phosphate in water figure 2 . The scanning electron micrograph of PNIPAM / SA-Zr is shown in image 3 a, It can be seen that PNIPAM / SA-Zr is spherical, with an average diameter of about 1.5 mm to 2 mm, and the outer surface is rough and porous. image 3 b is the SEM photo of the cross section of PNIPAM / SA-Zr, it can be seen that it has a porous structure. Obviously, the rough surface and por...

Embodiment 3

[0045] Effect of Contact Time on the Adsorption Performance of Porous Interpenetrating Network PNIPAM / SA-Zr for Phosphate in Water

[0046] The present invention uses the prepared porous interpenetrating network PNIPAM / SA-Zr gel ball (the molar ratio of PEG and NIPAM and SA monomer sum is 1 / 2) to be used for the adsorption research of phosphate in water, investigates the effect of contact time on PNIPAM / SA-Zr gel ball adsorption properties. Select ammonium molybdate spectrophotometry to measure the concentration of phosphate in water before and after adsorption, and use formula (1) to calculate its adsorption capacity:

[0047]

[0048] 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 ads...

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Abstract

The invention relates to a porous interpenetrating network poly N-isopropylacrylamide / zirconium alginate gel ball, and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a comonomer solution containing polyethylene glycol; (2) preparing a mixed solution of calcium chloride and ammonium persulfate; (3) dropping the solution obtained inthe step (1) into the mixed solution in the step (2) uniformly, introducing N2 to perform protection, soaking the gel ball after reacting for several times to obtain a porous interpenetrating networkpoly N-isopropylacrylamide / calcium alginate gel ball; and (4) putting the gel ball in the step (3) into a zirconium oxychloride solution, soaking, cleaning, filtering, freeze-drying and finally obtaining the porous interpenetrating network poly N-isopropylacrylamide / zirconium alginate gel ball. The gel ball contains Zr<4+> with extremely strong affinity on anions and a porous structure, so the gelball can effectively adsorb phosphate in water, and the adsorption quantity is up to 46.5 mg-P / G. Moreover, the gel ball has an interpenetrating network structure and higher stability, so even if thegel ball is reused for 5 times, the adsorption capability is only reduced by 8.7 percent.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a preparation method of porous interpenetrating network zirconium alginate gel balls which can efficiently absorb phosphate in water. Background technique [0002] Phosphorus is a major nutrient pollutant in water bodies and an important and non-renewable limited natural resource on the earth. As an important raw material for national production and life, terrestrial phosphorus resources are becoming increasingly scarce, and the recycling of phosphorus in wastewater has become an international hot topic in preparation for a rainy day. At present, many methods have been used to remove phosphate in sewage, mainly including biological method, ion exchange method, adsorption method, electrocoagulation method, chemical precipitation method and membrane separation method. Among the above methods, the adsorption method has the advantages of low cost, simple process, and easy ...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F222/38C08L35/00C08L5/04
Inventor 骆华勇荣宏伟曾学阳张耀坤
Owner GUANGZHOU UNIVERSITY
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