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Preparation method of β-cyclodextrin stabilized embedded nano zero-valent iron

A nano-zero-valent iron and cyclodextrin technology, applied in the coating and other directions, can solve the problems of nano-zero-valent iron instability, reduce the reaction rate, etc., and achieve the effect of being beneficial to recycling, high bioavailability, and reducing environmental risks

Inactive Publication Date: 2016-11-02
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention mainly aims at the problem that nanometer zero-valent iron is unstable in the air. When dealing with hydrophobic organic pollutants, due to the difference in polarity, the two are difficult to contact and reduce the reaction rate, and provide a more economical and more environmentally friendly nanometer Zero-valent iron stabilization embedding process

Method used

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  • Preparation method of β-cyclodextrin stabilized embedded nano zero-valent iron
  • Preparation method of β-cyclodextrin stabilized embedded nano zero-valent iron
  • Preparation method of β-cyclodextrin stabilized embedded nano zero-valent iron

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Effect test

Embodiment 1

[0044] Under the condition of nitrogen protection, add 200mg of nano-zero-valent iron, 6.0g of β-cyclodextrin and 15mL of 50% NaOH solution into a 250mL three-necked flask, and stir with an electric stirrer until it becomes a paste in a water bath at 60°C, and stir at a speed of 230rpm. Use a constant pressure dropping funnel to add 10mL of epichlorohydrin solution drop by drop. After 15 minutes, the dropwise addition is completed. Continue to stir for 0.5-1.0h until a block-shaped gel appears. Stop stirring and continue to react for 0.5h. Rinse the Buchner funnel with deoxygenated water and deoxygenated ethanol to neutrality, and after drying, black β-cyclodextrin polymer embeds nanometer zero-valent iron.

Embodiment 2

[0046] Under the condition of nitrogen protection, add 200mg of nano-zero-valent iron, 6.0g of β-cyclodextrin and 15mL of 50% NaOH solution into a 250mL three-necked flask, and stir with an electric stirrer until it becomes a paste in a water bath at 60°C, and stir at a speed of 230rpm. Use a constant pressure dropping funnel to add 15mL of epichlorohydrin solution drop by drop. After 15 minutes, the dropwise addition is completed. Continue to stir for 0.5-1.0h until a block-like gel appears. Stop stirring and continue to react for 0.5h. Take out the embedding. Rinse the Buchner funnel with deoxygenated water and deoxygenated ethanol to neutrality, and after drying, black β-cyclodextrin polymer embeds nanometer zero-valent iron.

Embodiment 3

[0048] Under the condition of nitrogen protection, add 200mg of nano-zero-valent iron, 6.0g of β-cyclodextrin and 10mL of 50% NaOH solution into a 250mL three-necked flask, and stir it with an electric stirrer until it becomes a paste in a water bath at 60°C, stirring at a speed of 230rpm, while Use a constant pressure dropping funnel to add 10mL of epichlorohydrin solution drop by drop. After 15 minutes, the dropwise addition is completed. Continue to stir for 0.5-1.0h until a block-shaped gel appears. Stop stirring and continue to react for 0.5h. Rinse the Buchner funnel with deoxygenated water and deoxygenated ethanol to neutrality, and after drying, black β-cyclodextrin polymer embeds nanometer zero-valent iron.

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Abstract

The invention relates to a preparation method of beta-cyclodextrin stabilized embedded nanoscale zero-valent iron. According to the method, beta-cyclodextrin is used a main raw material, and epichlorohydrin is used as a cross-linking agent; nanoscale zero-valent iron is subjected to cross-linking embedding under an alkaline condition, and the influence of the additive amount of the alkali on the formation and the performance of an embedding product is researched; the research shows that 40 percent NaOH solution has the best embedding effect and the best removal effect to Cd<2+>. The beta-cyclodextrin stabilized embedded nanoscale zero-valent iron prepared by the invention is environment-friendly, safe and non-toxic, has higher reaction activity and stability, and can be stably stored in air for several months, the storage, the transportation and the actual application of the nanoscale zero-valent iron are facilitated, and the method has excellent social benefit and environment benefit.

Description

technical field [0001] The invention relates to a method for stabilizing and embedding nanometer zero-valent iron, which belongs to the technical field of modification of nanometer zerovalent iron. Background technique [0002] Nanoscale zero-valent iron has shown superior performance in solving a series of environmental problems such as organic pollution, heavy metal pollution, and environmental pollution remediation. 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 st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02
Inventor 康海彦张晗毛艳丽杨治广王现丽朱慧杰郭一飞王增欣陈松涛王学花
Owner HENAN UNIV OF URBAN CONSTR