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A preparation method of sodium alginate/β-cyclodextrin synergistically immobilized nanometer zero-valent iron

A technology of nano-zero-valent iron and sodium alginate, which is applied in coatings and other directions, can solve problems such as instability, spontaneous combustion of nano-zero-valent iron, and difficulty in recycling, and achieve low cost, favorable reuse, and high reactivity. Effect

Inactive Publication Date: 2016-06-01
HENAN UNIV OF URBAN CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention mainly aims to provide a greener, more environmentally friendly and low-cost nano-zero-valent iron immobilization method for the problems that nano-zero-valent iron is easy to spontaneously combust, is unstable in the air, and is difficult to recycle after being applied to environmental pollution repair.

Method used

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  • A preparation method of sodium alginate/β-cyclodextrin synergistically immobilized nanometer zero-valent iron
  • A preparation method of sodium alginate/β-cyclodextrin synergistically immobilized nanometer zero-valent iron
  • A preparation method of sodium alginate/β-cyclodextrin synergistically immobilized nanometer zero-valent iron

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Experimental program
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Effect test

Embodiment 1

[0044] Weigh 0.6g of sodium alginate into a 250mL three-neck bottle, stir and dissolve with 29.4mL of deoxygenated deionized water in a water bath at 70°C to obtain a colorless and transparent solution; pour the solution into a container containing 70mg of freshly prepared nanometer zero-valent iron reagent In the bottle, ultrasonically disperse for 10-20min, then add 4.0% CaCl dropwise to the mixture under the condition of 200rpm magnetic stirring 2 In the solution, the cross-linking reaction was carried out for 0.5h, and the product was obtained by filtration. The ball forming performance of the product is very poor, there is obvious tailing phenomenon, and the mechanical strength is low.

Embodiment 2

[0046] Weigh 0.6g of sodium alginate into a 250mL three-neck flask, stir and dissolve with 29.4mL of deoxygenated deionized water in a water bath at 70°C to obtain a colorless and transparent solution; weigh another 0.05g of β-cyclodextrin into a 50mL small beaker, Dissolve in 9.95mL deoxygenated and deionized water in a water bath at 70°C to obtain a colorless and transparent solution; pour the β-cyclodextrin solution into the sodium alginate solution, ultrasonically defoam for 10-20 minutes under nitrogen protection, and dissolve the mixed solution Pour it into a reagent bottle containing 70 mg of freshly prepared nano-zero-valent iron, disperse it ultrasonically for 10-20 minutes, and then add 4.0% CaCl dropwise to the mixture under the condition of magnetic stirring at 200 rpm. 2 In the solution, the cross-linking reaction was carried out for 0.5h, and the product was obtained by filtration. The product formed into balls had tailing phenomenon and had high mechanical streng...

Embodiment 3

[0048] Weigh 0.6g of sodium alginate into a 250mL three-neck flask, stir and dissolve with 29.4mL of deoxygenated deionized water in a water bath at 70°C to obtain a colorless and transparent solution; weigh another 0.1g of β-cyclodextrin into a 50mL small beaker, Dissolve in 9.9mL deoxygenated and deionized water in a water bath at 70°C to obtain a colorless and transparent solution; pour the β-cyclodextrin solution into the sodium alginate solution, and ultrasonically defoam for 10-20 minutes under nitrogen protection, and dissolve the mixed solution Pour it into a reagent bottle containing 70 mg of freshly prepared nano-zero-valent iron, disperse it ultrasonically for 10-20 minutes, and then add 4.0% CaCl dropwise to the mixture under the condition of magnetic stirring at 200 rpm. 2 In the solution, the cross-linking reaction was carried out for 0.5 h, and the sodium alginate / β-cyclodextrin-immobilized nano zero-valent iron black gel beads were obtained by filtration, with a...

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Abstract

The invention relates to a method for preparing sodium alginate (SA) / beta-cyclodextrin (beta-CD) collaborative immobilized nanometer zero-valent iron. The SA and the beta-CD are taken as main raw materials, CaCl2 serves as a cross-linking agent, collaborative immobilized operation is carried out on the nanometer zero-valent iron, the influence of the raw material ratio and the concentration of the cross-linking agent on the property of gel beads is researched, and according to the research, it is found that the good effect on the collaborative immobilized operation of nanometer Fe0 is achieved according to the following ratios, 4.0 percent of CaCl2 serves as the cross-linking agent, the concentration of the SA is 2.0 percent, 1.5 percent and 1.5 percent, and the concentration of corresponding beta-CD is 1.0 percent, 0.5 percent and 1.0 percent. The effect of the immobilized nanometer zero-valent iron on removing of heavy metal ions Cd2+ and Pb2+ is researched, and it is found that the removing effect is good. The immobilized nanometer zero-valent iron prepared through the method has the advantages of being environmentally friendly, safe, non-poisonous, high in reaction activity and stability and capable of being stably stored for months in air.

Description

technical field [0001] The invention relates to a green immobilization method of nanometer zero-valent iron, which belongs to the technical field of modification of nanometer zerovalent iron Background technique [0002] Nano-zero-valent iron has shown superior performance in solving a series of environmental problems such as organic pollution, heavy metal pollution and environmental pollution restoration. However, due to the magnetic attraction of nano-zero-valent iron particles, it is easy to cause agglomeration, easy to oxidize or even spontaneously ignite in the environment, and reduce the adsorption points of nano-zero-valent iron particles, reduce the effective contact area with pollutants, and reduce the degradation efficiency; At the same time, the agglomeration is also not conducive to the mobility of nano-zero-valent iron in environmental water and soil, which is not conducive to the restoration of environmental pollution. Nano zero-valent iron has strong reducing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 康海彦王红强毛艳丽张晗杨治广王增欣郭一飞张岩刘雪平王学花
Owner HENAN UNIV OF URBAN CONSTR