Preparation method of attapulgite-loaded nanometre iron material

A technology of attapulgite and nano-iron, applied in chemical instruments and methods, silicates, inorganic chemistry, etc., can solve the problems of reducing the activity of nano-iron particles, affecting the effect of pollutant treatment, particle agglomeration, etc. Effects of agglomeration and auto-oxidation, good suspension and stability, good dispersion and stability

Inactive Publication Date: 2012-10-31
NANJING UNIV
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Problems solved by technology

[0003] Because the particle size of nano-iron is 50-200nm, the specific surface area is large, it is easy to cause particle agglomeration reaction, it is difficult to maintain a stable suspension state, it is not conducive to its full contact reaction with environmental pollutants, and it is easy to cause the prob...

Method used

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Effect test

Embodiment 1

[0025] Aiming at the disadvantages of nano-iron being easy to agglomerate, oxidize, and precipitate during use, the present invention uses attapulgite as a carrier material and adopts a liquid phase reduction method to prepare attapulgite-loaded nano-iron material in situ.

[0026] (1) Pretreatment activation of attapulgite: under the condition of 70°C water bath, mix 100g of attapulgite mineral powder, 10g of sodium hexametaphosphate, and 1L of deionized water, and use mechanical stirring and ultrasonic assisted dispersion for 5 hours. Mix the reactants thoroughly. After standing still for 24 hours, the mixed liquid system is divided into three layers, the upper layer is clear liquid, the middle layer is milky white suspension, and the lower layer is brown coarse soil precipitation. After gently pouring off the supernatant, extract the milky white suspension, and then Centrifuge for 30 minutes under the condition of 1 / min, and discard the supernatant. The obtained precipitat...

Embodiment 2

[0031] (1) Pretreatment activation of attapulgite: under the condition of 80°C water bath, mix 100g of attapulgite mineral powder, 10g of sodium hexametaphosphate, and 1L of deionized water, and use mechanical stirring and ultrasonic assisted dispersion for 8 hours. Mix the reactants thoroughly. After standing still for 24 hours, the mixed liquid system is divided into three layers, the upper layer is clear liquid, the middle layer is milky white suspension, and the lower layer is brown coarse soil precipitation. After gently pouring off the supernatant, extract the milky white suspension, and then Centrifuge for 30 minutes under the condition of 1 / min, and discard the supernatant. The obtained precipitates were rinsed three times with 0.5L deionized water to balance, then activated at 250°C for 2 hours, then crushed and ground and passed through a 200-mesh sieve, and finally the obtained attapulgite was stored in a dry box for future use.

[0032] (2) Acidification modificat...

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Abstract

The invention provides a preparation method of an attapulgite-loaded nanometre iron material. Acidized and modified attapulgite is taken as a load material, and KBH4, NaBH4, N2H4 and the like are taken as reducing agent under the protection of inert gases, so that ferric salt or ferrite can be reduced to be zero-valent iron; and the multi-duct characteristic of the attapulgite is utilized, so that nanometre iron particles are sufficiently dispersed and fixedly loaded on the attapulgite material. Compared with un-loaded nanometre iron, the attapulgite-loaded nanometre iron material prepared by the preparation method has better dispersibility and stability, is more uniform in particle size distribution, not easy to cause particle agglomeration and self-oxidization; and moreover, the attapulgite-loaded nanometre iron material has better suspension property and stability in aqueous solution, a stronger oxidative degradation ability to environmental pollutants, longer effective reaction time, and a better adsorption capacity. The material is expected to be extensively applied to environment pollution abatement and repair engineering, and fills a blank in the filed at home and abroad.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials and nanometer materials, and in particular relates to a preparation method of attapulgite loaded nanometer iron materials. Background technique [0002] Due to the advantages of small scale, large surface effect, and high reactivity, nano-iron can quickly and effectively degrade environmental organic pollutants or restore and fix heavy metal pollution in the environment. It is a very good environmental functional material. The production cost of nano-iron is relatively low, and there is little harm to the environment and human health. Therefore, nano-iron has been widely valued in soil, wastewater, air and groundwater pollution control and restoration work, and has a very broad application prospect in the field of environmental protection in the future. [0003] Since the particle size of nano-iron is 50-200nm, the specific surface area is large, it is ea...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/16C02F1/28
Inventor 谢显传钱言翟建平崔浩
Owner NANJING UNIV
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