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Coated type nanoscale zero-valent iron as well as preparation method and application thereof

A nano-zero-valent iron, coated technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc. Mobility and other issues, to achieve the effect of reducing mobility and bioavailability, good mobility and low production cost

Active Publication Date: 2016-10-12
HUNAN SANYOU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the problem that nano-zero-valent iron is easily oxidized, its reactivity is reduced, and at the same time, due to its high surface area and its own magnetic attraction, it is easy to cause agglomeration, thereby reducing the adsorption sites of nano-zero-valent iron. ; In addition, the agglomeration of nano-zero-valent iron is not conducive to its fluidity in sediment

Method used

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  • Coated type nanoscale zero-valent iron as well as preparation method and application thereof
  • Coated type nanoscale zero-valent iron as well as preparation method and application thereof
  • Coated type nanoscale zero-valent iron as well as preparation method and application thereof

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Effect test

Embodiment 1

[0034] A coated nano-zero-valent iron of the present invention, the coated nano-zero-valent iron includes nano-zero-valent iron and sodium alginate, and the sodium alginate is coated on the surface of the nano-zero-valent iron, wherein the sodium alginate and nano-zero The mass ratio of valence iron is 0.1:1.

[0035] A method for preparing the coated nanometer zero-valent iron of the above-mentioned present embodiment, comprising the following steps:

[0036] (1) FeSO 4 Solution preparation: weigh 2.8000g FeSO 4 ·7H 2 Put O in a beaker, add an appropriate amount of ultrapure water to dissolve and transfer it to a 100mL volumetric flask, use ultrapure water to make up the volume to the mark, and shake well to obtain FeSO with a concentration of 0.1M. 4 solution.

[0037] (2)NaBH 4 Solution preparation: weigh 0.7566g NaBH 4 Put it in a beaker, add an appropriate amount of ultrapure water to dissolve it and transfer it to a 100mL volumetric flask, use ultrapure water to ma...

Embodiment 2

[0043] A coated nano-zero-valent iron of the present invention, the coated nano-zero-valent iron includes nano-zero-valent iron and sodium alginate, and the sodium alginate is coated on the surface of the nano-zero-valent iron, wherein the sodium alginate and nano-zero The mass ratio of valence iron is 0.2:1.

[0044] A method for preparing the coated nanometer zero-valent iron of the above-mentioned present embodiment, comprising the following steps:

[0045] (1) FeSO 4 Solution preparation: weigh 3.3600g FeSO 4 ·7H 2 Put O in a beaker, add an appropriate amount of ultrapure water to dissolve it and transfer it to a 100mL volumetric flask, use ultrapure water to make the volume up to the mark, shake well, and obtain FeSO with a concentration of 0.12M 4 solution.

[0046] (2)NaBH 4 Solution preparation: weigh 0.9079g NaBH 4 Put it in a beaker, add an appropriate amount of ultrapure water to dissolve and transfer it to a 100mL volumetric flask, use ultrapure water to make...

Embodiment 3

[0053] A coated nano-zero-valent iron of the present invention, the coated nano-zero-valent iron includes nano-zero-valent iron and sodium alginate, and the sodium alginate is coated on the surface of the nano-zero-valent iron, wherein the sodium alginate and nano-zero The mass ratio of valence iron is 0.3:1.

[0054] A method for preparing the coated nanometer zero-valent iron of the above-mentioned present embodiment, comprising the following steps:

[0055] (1) FeSO 4 Solution preparation: weigh 5.3200g FeSO 4 ·7H 2 Put O in a beaker, add an appropriate amount of ultrapure water to dissolve it and transfer it to a 100mL volumetric flask, use ultrapure water to set the volume to the mark, shake well, and obtain FeSO with a concentration of 0.19M 4 solution.

[0056] (2)NaBH 4 Solution preparation: weigh 1.4375g NaBH 4 Put it in a beaker, add an appropriate amount of ultrapure water to dissolve and transfer it to a 100mL volumetric flask, use ultrapure water to make up ...

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Abstract

The invention discloses coated type nanoscale zero-valent iron as well as a preparation method and an application thereof. The coated type nanoscale zero-valent iron comprises nanoscale zero-valent iron and sodium alginate, wherein the nanoscale zero-valent iron is coated with sodium alginate, and a mass ratio of sodium alginate to the nanoscale zero-valent iron is (0.1-0.4):1. The preparation method of the coated type nanoscale zero-valent iron comprises the step that the nanoscale zero-valent iron and a sodium alginate solution are mixed and subjected to ultrasonic treatment, and the coated type nanoscale zero-valent iron is obtained. The coated type nanoscale zero-valent iron can be used for treating sediment with heavy metal pollution, is simple and convenient to operate, good in stabilizing effect, good in mobility, low in repair cost, clean and pollution-free, has no toxic and harmful effects on the environment and has broad application prospect in the technical field of treatment of heavy metal pollution of the sediment.

Description

technical field [0001] The invention belongs to the field of physical and chemical treatment of heavy metals in polluted bottom mud, and in particular relates to a coated nanometer zero-valent iron, a preparation method thereof and an application of the coated nanometer zerovalent iron in stabilizing heavy metal cadmium in bottom mud. Background technique [0002] In recent years, during the rapid development of my country's national economy, a large amount of heavy metal pollutants have been discharged into rivers, rivers, lakes, and seas, polluting water bodies and sediments. Excessively deposited heavy metals in the sediment are easily re-released into the water body, affecting the water quality of the upper water body and forming secondary pollution; it will also cause varying degrees of damage to aquatic ecosystems such as large aquatic plants, algae, benthic animals, fish and microorganisms. Harm; even through the food chain enrichment, it poses a threat to human healt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F11/00
CPCB01J20/24B01J2220/48C02F11/00C02F2101/20
Inventor 黄丹莲薛文静曾光明赖萃万佳陈国敏黄超
Owner HUNAN SANYOU ENVIRONMENTAL TECH CO LTD
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