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Preparation method and application of suspension type material of starch modified nanoscale zero-valent iron

A nano-zero-valent iron, modification and modification technology, applied in the field of nanomaterials and water environment pollution remediation, can solve problems such as shortening migration distance, easy particle agglomeration, oxidation, etc., and achieves broad implementation prospects, good environmental friendliness, and feasibility. high effect

Inactive Publication Date: 2016-08-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a starch-modified nano-zero-valent iron suspension material for the existing nano-scale zero-valent iron particles that are easy to agglomerate in water, cause precipitation due to oxidation, and shorten the migration distance.

Method used

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  • Preparation method and application of suspension type material of starch modified nanoscale zero-valent iron
  • Preparation method and application of suspension type material of starch modified nanoscale zero-valent iron
  • Preparation method and application of suspension type material of starch modified nanoscale zero-valent iron

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Effect test

Embodiment 1

[0025] Example 1: Selection of dispersant ratio and synthesis of modified nano zero-valent iron

[0026] (1) Preparation of sodium carboxymethyl starch modified zero-valent nano-iron suspension

[0027] with FeSO 4 ·7H 2 FeSO with a concentration of 17.86mmol / L was prepared with O and deoxygenated deionized water 4 Solution 100mL, stirred for 5min under the condition of 300rpm / min; configuration concentration is 2.22g / L, 2.50g / L, 2.67g / L, 2.78g / L carboxymethyl starch sodium (CMS-Na) solution 150mL, respectively The two solutions were mixed and stirred evenly, and stirred for 15 minutes under nitrogen at the same speed; 4 Prepare 250 mL of NaBH with a concentration of 15.72 mmol / L and deionized water 4 solution, FeSO was pumped at a rate of 4000 μL / min with a peristaltic pump 4 and CMS-Na mixed solution, while pumping, use an electric stirrer to stir the mixed solution at a speed of 600rpm, and wait for the NaBH 4 After the solution is all pumped into the mixture, continu...

Embodiment 2

[0033] Example 2: Preparation of sodium carboxymethyl starch modified nano-iron and removal of 2,4-DCP in water

[0034] with FeSO 4 ·7H 2 FeSO with a concentration of 0.179 mol / L was prepared with O and deoxygenated deionized water 4 Solution 100mL, stir 5min under the situation of 300rpm / min; Concentration is the carboxymethyl starch sodium (CMS-Na) solution 150mL of 16g / L, 25g / L, 26g / L, mix and stir two kinds of solutions respectively, Stir with nitrogen gas at the same speed for 15 min; then use NaBH 4 Prepare 250 mL of NaBH with a concentration of 0.157 mol / L and deionized water 4 solution, FeSO was pumped at a rate of 4000 μL / min with a peristaltic pump 4 and CMS-Na mixed solution, while pumping, use an electric stirrer to stir the mixed solution at a speed of 600rpm, and wait for the NaBH 4After the solution is all pumped into the mixture, continue to stir for 15 minutes and use nitrogen to make NaBH 4 with FeSO 4 After complete mixing and reaction, a modified na...

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Abstract

The invention discloses a preparation method and application of a suspension type material of starch modified nanoscale zero-valent iron, and belongs to the field of nanometer materials and water environment pollution repair. Surface modification is carried out on nanoscale zero-valent iron particles with small particle diameter and high activity, low-cost environment-friendly sodium carboxymethyl starch is used as a dispersing agent, and the nanoscale zero-valent iron is stably dispersed on the condition of maintaining the activity of nanoscale iron. The process is easy, convenient and easy to operate, the cost is low, the good dispersing effect can be achieved, the agglomeration phenomenon of the nanosale iron in water can be effectively reduced, migration of modified nanoscale iron is promoted, and the removal efficiency of the particles for organic pollutant is improved.

Description

technical field [0001] The invention belongs to the field of nano-materials and water environment pollution restoration, and relates to a method for preparing a starch-modified nano-zero-valent iron suspension material. Background technique [0002] The pollution of groundwater is concealed, complex and difficult to control, and it is a slow accumulation process. It will take a long time to achieve the self-purification of water bodies only by natural restoration and natural attenuation. The methods of groundwater remediation are mainly divided into two categories, in situ remediation and ex situ remediation. Common in-situ repair techniques, such as: permeable reactive grid (PRB), microbial / plant treatment, etc., have the disadvantages of long repair time and great limitations due to site factors. As a common ex-situ restoration technology, the extraction treatment method requires a large amount of engineering and high cost, and new pollution is likely to be generated dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/24B01J20/30C02F1/28C02F1/70C02F103/06C02F101/30
CPCB01J20/02B01J20/24B01J20/28C02F1/288C02F1/705C02F2101/30C02F2103/06
Inventor 张永祥常杉徐毅李飞兰双双
Owner BEIJING UNIV OF TECH
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