Attapulgite-loaded zero-valent iron repair material and preparation method thereof

A technology for attapulgite and repairing materials, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of easy oxidation, affecting the effect of pollutant treatment, particle agglomeration reaction, etc. Achieve the effect of not easy particle agglomeration and auto-oxidation, good suspension and stability, good dispersibility and stability

A technology for attapulgite and repairing materials, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of easy oxidation, affecting the effect of pollutant treatment, particle agglomeration reaction, etc. Achieve the effect of not easy particle agglomeration and auto-oxidation, good suspension and stability, good dispersibility and stability

CN106512971AInactive Publication Date: 2017-03-22北京德瑞科森环保科技有限公司
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) dissolving ferrous sulfate heptahydrate into anaerobic water, adding attapulgite particles of 100 meshes in proportion to ferrous sulfate heptahydrate solution to obtain a mixed solution;

[0025] (2) The mixed liquid obtained in the step (1) was stirred electrically at 1400 r / min for 20-30 min under the protection of an inert gas.

[0026] (3) Add NaBH to the mixed solution mixed in step (2) 4 As a reducing agent, control NaBH 4 The drop rate of the solution is 0.05ml / s. After the reduction process is completed, place a magnet at the bottom of the conical flask under the protection of an inert gas and let it stand for 20-30 minutes; after standing, pour off the supernatant, and transfer the remaining solid to a centrifuge Medium fast centrifugation for 2 minutes, the centrifuge speed is 4500r / min, centrifuge and wash the solid with absolute ethanol 3 to 4 times, put the solid in a vacuum drying oven at 50°C for 6 hours, grind and sieve to get attapulgite with zero...

Embodiment 2

[0035] (1) In a 1000ml Erlenmeyer flask, add 500ml of deoxidized deionized water with a pH of 5, then add 3.0g of high-purity attapulgite and 7.5g of ferric chloride successively, and stir electrically for 20min at a speed of 1400r / min to make The attapulgite is saturated to adsorb iron ions to obtain a mixed solution.

[0036] (2) Control the ventilation rate of nitrogen to 0.5ml / min. Under the condition of nitrogen protection, move the Erlenmeyer flask to a magnetic stirrer for stirring to prevent oxidation of iron ions.

[0037] (3) Weigh 2.25gNaBH 4 Dissolve in 500ml deoxygenated deionized water to get 4.5g / L NaBH 4 solution. The solution was added dropwise into the Erlenmeyer flask through the dropping funnel to control the NaBH 4 The dripping speed of the solution is 0.05ml / s. After the reduction process is completed, place a magnet at the bottom of the conical flask under the protection of nitrogen and let it stand for 20 minutes; after standing, pour off the superna...

Embodiment 3

[0039] (1) Add 500ml of deoxidized deionized water with a pH of 4 in a 1000ml Erlenmeyer flask, then add 3.0g of high-purity attapulgite, 4.5g of ferric nitrate and 4.5g of ferrous nitrate in turn, and then drive the tank at a speed of 1400r / min. Stir for 30 minutes to saturate the attapulgite to absorb iron ions and ferrous ions to obtain a mixed solution.

[0040] (2) Control the ventilation rate of nitrogen to 0.8ml / min. Under the condition of nitrogen protection, move the Erlenmeyer flask to a magnetic stirrer for stirring to prevent the oxidation of ferric ions and ferrous ions.

[0041] (3) Weigh 2.75gNaH 2 PO 2 Dissolve in 500ml deoxygenated deionized water to get 5.5g / L NaH 2 PO 2 solution. The solution was added dropwise into the Erlenmeyer flask through the dropping funnel, and the NaH 2 PO 2 The solution dripping speed is 0.05ml / s. After the reduction process is completed, place a magnet at the bottom of the conical flask under nitrogen protection and let it s...

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Abstract

The invention provides an attapulgite-loaded zero-valent iron repair material. The attapulgite-loaded zero-valent iron repair material uses attapulgite as a carrier; zero-valent iron is of monodisperse spherical or ellipsoidal morphology; and the average particle size of the zero-valent iron is in a range of 50 to 150 nm. A preparation method for the attapulgite-loaded zero-valent iron repair material comprises the following steps: (1) successively adding a ferric salt or / and a ferrous salt and attapulgite into oxygen-free anoxic water and carrying out stirring under the protection of inert gas so as to obtain mixed liquid; and (2) adding a reducing agent into the mixed liquid and carrying out stirring and solid-liquid separation so as to obtain a solid, i.e., attapulgite-loaded zero-valent iron. The attapulgite-loaded zero-valent iron prepared in the invention can make full use of interlayer and surface space of attapulgite, has better dispersibility and stability and more uniform particle size distribution, is not prone to particle agglomeration and autoxidation and presents better suspensibility and stability in an aqueous solution; and when applied to pollutants, the attapulgite-loaded zero-valent iron has longer reaction time and better adsorption capability.

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 an attapulgite-loaded zero-valent iron repair material. [0002] The present invention also relates to a method for preparing the attapulgite-loaded zero-valent iron restoration material. Background technique [0003] Zero-valent iron has many characteristics such as high specific surface area, good catalytic activity, strong adsorption, low cost, and environmental friendliness, and its combination of reduction and adsorption makes it very useful in the degradation and removal of various pollutants. Therefore, it has gradually been widely used in the remediation of various heavy metals and organic pollution, and has a very broad application prospect in the field of environmental protection. [0004] However, zero-valent iron still has many limitations in practical applications. For example, the large s...

Claims

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Application Information

Patent Timeline
22 Mar 2017
Publication
CN106512971A
IPC
B01J20/30; B01J20/12; B01J20/28; C02F1/28
CPC
B01J20/12; B01J20/02; B01J20/28004; B01J20/28016; B01J2220/42; B01J2220/4806; C02F1/281
Inventors
向猛; 张洁琼