Modified nanoscale zero-valent iron and preparation method and application thereof

A nano-zero-valent iron, modified technology, applied in transportation and packaging, metal processing equipment, etc., can solve the problem of the decrease in the mobility and activity of nano-zero-valent iron particles, reduce the adsorption sites of nano-zero-valent iron particles, and adversely affect nano-zero-valent iron particles. Solving problems such as the fluidity of valence iron particles, to achieve good application value, good stability efficiency, and improve the effect of dispersion effect

Active Publication Date: 2017-06-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the magnetic attraction of the nano-zero-valent iron particles themselves, it is easy to cause agglomeration, which reduces the adsorption points of the nano-zero-valent iron particles, and the nano-zero-valent iron particles are easy to react with the surrounding medium (such as dissolved oxygen, water), and it is easy to It is oxidized, thereby reducing its reactivity; at the same time, the particles are usually micron-sized particles after agglomeration, which makes the mobility and activity of nano-zero-valent iron particles in the sediment drop rapidly, which is not conducive to the environment Mobility in water bodies and soils, which is not conducive to the remediation of environmental pollution

Method used

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  • Modified nanoscale zero-valent iron and preparation method and application thereof
  • Modified nanoscale zero-valent iron and preparation method and application thereof
  • Modified nanoscale zero-valent iron and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A modified nano-zero-valent iron, the modified nano-zero-valent iron includes rhamnolipid (RL) and nano-zero-valent iron, and the rhamnolipid is modified on the surface of the nano-zero-valent iron, wherein the rhamnolipid is a dispersant .

[0040] In this embodiment, the mass ratio of rhamnolipid to nanometer zero-valent iron is 0.1:1.

[0041] In this embodiment, the particle size of the modified nano zero-valent iron is 120nm.

[0042] A preparation method of the modified nano zero-valent iron in the above-mentioned present embodiment, comprising the following steps:

[0043] (1) Prepare the solution:

[0044] FeSO 4 Solution preparation: weigh 0.496g FeSO 4 ·7H 2 Put O in a beaker, add an appropriate amount of ultrapure water to dissolve it and transfer it to a 25mL volumetric flask, use ultrapure water to make up the volume to the mark, shake well, and obtain FeSO with a concentration of 0.07M 4 solution.

[0045] Preparation of rhamnolipid solution: Weigh ...

Embodiment 2

[0049] A modified nano-zero-valent iron, which is basically the same as the modified nano-zero-valent iron in Example 1, the only difference being that the mass ratio of rhamnolipid to nano-zero-valent iron in Example 2 is 0.3:1.

[0050] A method for preparing the modified nano-zero-valent iron of the above-mentioned embodiment is basically the same as that of the embodiment 1, except that the concentration of the rhamnolipid solution in the embodiment 2 is 0.6 g / L. The modified nano zero-valent iron (RL-nZVI) suspension prepared by the method is coded as R2.

Embodiment 3

[0052] A modified nano-zero-valent iron, which is basically the same as the modified nano-zero-valent iron in Example 1, the only difference being that the mass ratio of rhamnolipid to nano-zero-valent iron in Example 3 is 0.5:1.

[0053] A method for preparing the modified nano-zero-valent iron of the above-mentioned embodiment is basically the same as that of the embodiment 1, except that the concentration of the rhamnolipid solution in the embodiment 3 is 1 g / L. The modified nano zero-valent iron (RL-nZVI) suspension prepared by the method is numbered R3.

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Abstract

The invention discloses modified nanoscale zero-valent iron and a preparation method and application of the modified nanoscale zero-valent iron. The modified nanoscale zero-valent iron comprises rhamnolipid and nanoscale zero-valent iron. The surface of the nanoscale zero-valent iron is modified through the rhamnolipid, and the mass ratio of the rhamnolipid to the nanoscale zero-valent iron is 0.1-2:1. The preparation method comprises the steps that a rhamnolipid solution and a ferrous sulfate solution are mixed, and a NaHB4 solution is dropwise added for a reaction to obtain the modified nanoscale zero-valent iron. The modified nanoscale zero-valent iron has the advantages of being good in dispersing performance, good in stability, high in reaction activity, high in permeability and the like, has the good stabilization efficiency for metal lead in bottom mud, brings no secondary pollution to environment, has a good application value, and has the wide application prospect in the technical field of bottom mud heavy metal pollution treatment.

Description

technical field [0001] The invention belongs to the field of physical and chemical treatment of heavy metals in polluted bottom mud, and relates to a modified nano material and a preparation method thereof, in particular to a modified nano zero-valent iron, a preparation method and an application thereof. Background technique [0002] Water body sediment is the main reservoir of pollutants in rivers or lakes, and it can also directly reflect the pollution history of water bodies. In recent years, the rapid development of my country's industry has caused many rivers to be seriously polluted by heavy metals, especially its sediment. The heavy metals in the sediment not only pollute the water body, endanger the benthic organisms of the river, but also have an impact on human life and production. [0003] Lead is an important toxic pollutant in the environment. It can denature and inactivate active proteins in the brain, disrupt or stop related functional activities, and even ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02
CPCB22F9/24B22F1/102
Inventor 薛文静黄丹莲彭志威曾光明万佳张辰邓锐胡正勋胡婵娟秦香王茜
Owner HUNAN UNIV
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