Nano zero-valent iron with montmorillonite serving as carrier, and preparation method and application thereof

A nano-zero-valent iron and montmorillonite technology, applied in the field of nanomaterials, can solve the problems of underutilized surface, reduced reactivity and utilization efficiency, underutilized and other problems

Inactive Publication Date: 2013-02-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantages of the prior art are: the zero-valent iron in the montmorillonite in-situ intercalation nano-zero-valent iron composite material is only between the montmorillonite layers, the layered surface of the montmorillonite is not fully utilized, and the layered surface of the montmorillonite It is also an ideal template for zero-valent iron, but in the above-mentioned patents, nano-zero-valent iron is in the interlayer accounting for a small part of montmorillonite, and the surface that accounts for most of the proportion has not been fully utilized; nano-zero-valent iron is in the Fe 3+ There are still some agglomerations in the saturated montmorillonite, which reduces its reactivity and utilization efficiency

Method used

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  • Nano zero-valent iron with montmorillonite serving as carrier, and preparation method and application thereof
  • Nano zero-valent iron with montmorillonite serving as carrier, and preparation method and application thereof
  • Nano zero-valent iron with montmorillonite serving as carrier, and preparation method and application thereof

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Embodiment 1

[0045] Preparation of nanometer zero-valent iron with montmorillonite as carrier:

[0046] (1) Ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O) 20 g was dissolved in 100 mL of deionized water, and 0.7 g of soluble starch, 50 mL of absolute ethanol and 4 g of montmorillonite particles were added to the ferrous sulfate heptahydrate solution to obtain a mixed solution;

[0047] (2) Ultrasonic disperse the mixed solution at 250W for 12min, then pass argon gas into the mixed solution at 0.6mL / min and stir at 1050r / min for 5h to obtain the precursor solution;

[0048] (3) Dissolve 9g of sodium borohydride in 100mL of deionized water, pass argon gas into the precursor solution at 0.6mL / min and stir at 1050r / min, and at the same time, dissolve the obtained sodium borohydride solution at 0.005mL / s Add at a high speed, and then stir for 1 hour after the addition, separate the black product obtained from the reaction from the liquid phase, wash the black product alternately with deionized...

Embodiment 2

[0054] First prepare potassium saturated montmorillonite particles:

[0055] Pour 250 mL of 0.5 mol / L KCl solution into a bottle containing 20 g of montmorillonite, shake and mix at 180 rpm in a shaking box for 9.5 hours, centrifuge at 4000 rpm in a centrifuge for 25 minutes, and pour out the supernatant;

[0056] Add 250 mL of 0.5 mol / L KCl solution to the solid particles in the lower layer, shake and mix at 180 rpm for 9.5 hours in a shaking box, centrifuge at 4000 rpm for 25 minutes in a centrifuge, repeat 3 times, and obtain pre-potassium saturated montmorillonite;

[0057] Add 250mL of deionized water to the obtained pre-potassium saturated montmorillonite, shake and mix it at 180rpm in a shaking box for 9.5h, then centrifuge at 4000rmp in a centrifuge for 25 minutes, and repeatedly centrifuge and wash until it is washed with 0.2mol / L AgNO 3 The solution does not detect Cl in the centrifuged supernatant - After freeze-drying, the obtained solid is potassium-saturated mo...

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Abstract

The invention provides nano zero-valent iron with montmorillonite serving as a carrier, and a preparation method and application thereof. The method comprises the steps of dissolving ferrous sulfate, adding soluble starch and montmorillonite particles into the ferrous sulfate solution in proportion, and obtaining mixed liquid; stirring after performing ultrasound treatment to the obtained mixed liquid, and obtaining precursor solution; adding the obtained precursor solution into sodium borohydride or potassium borohydride solution in proportion under the conditions of continuous stirring, continuing stirring for a period of time, performing solid-liquid separation, and obtaining the solid which is the nano zero-valent iron with montmorillonite serving as the carrier. According to the prepared nano zero-valent iron with montmorillonite serving as the carrier, interlayer and surface spaces of montmorillonite can be fully utilized, the activity and the stability are high, polymerization of the nano zero-valent iron can be reduced, and the nano zero-valent iron has remarkable effect when used for treating waste water containing hexavalent chromium.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a nanometer zero-valent iron with montmorillonite as a carrier, a preparation method and application thereof. Background technique [0002] Due to its strong reducing ability and cheap and easy-to-obtain raw materials, nano-zero-valent iron is not easy to cause secondary pollution during use, and it can efficiently remove pollutants in sediment or water, such as halogenated organic compounds, nitroaromatic compounds, and heavy metal ions. It has great application prospects in the field of wastewater treatment. [0003] However, there are still many limitations in practical application of nano-zero-valent iron, mainly reflected in: nano-zero-valent iron particles are prone to agglomeration in solution, thereby greatly reducing its reactivity and utilization efficiency; nano-zero-valent iron has high activity, It will react with oxygen and water in water, thereby reducing the removal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/28C02F1/58C02F1/62
Inventor 江鸿张园园
Owner UNIV OF SCI & TECH OF CHINA
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