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Preparation method of modified zero-valence nano-iron suitable for underground water treatment

A zero-valent nano-iron and groundwater pollution technology, applied in the field of nano-materials, can solve the problems of unsuitable zero-valent nano-iron, high price, and large dosage, and achieve the effect of saving input, cheap price, and low dosage

Inactive Publication Date: 2013-03-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some effective dispersants have also been found, such as starch, polyacrylic acid, sodium dodecylsulfonate, sodium carboxymethylcellulose, PV3A, etc., but these dispersants have a large amount of use and a high price, and are not suitable for zero-valent nanometers. Practical Application of Iron in Groundwater

Method used

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  • Preparation method of modified zero-valence nano-iron suitable for underground water treatment
  • Preparation method of modified zero-valence nano-iron suitable for underground water treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0027] with FeCl 3 .6H 2 O and deionized water to prepare FeCl with a concentration of 0.045 mol / L 3 solution, stirred at 600 rpm for 20 min; then with NaBH 4 Prepare the same FeCl with deionized water 3 An equal volume of NaBH with a concentration of 0.25 mo / L 4 solution, pump FeCl at a rate of 40 mL / min with a constant flow pump 3 solution; after adding NaBH 4 At the same time as the solution, use an electric stirrer to stir the mixed solution at a speed of 600 rpm; 4 The solution is all pumped into FeCl 3 After solution, continue stirring for 15 min to make NaBH 4 with FeCl 3 The mixed reaction is complete; let it stand for 20 minutes, and use double-layer medium-speed filter paper to vacuum filter to obtain zero-valent nano-iron with a moisture content of 73.28%. Nitrogen, store below 5 ℃ for future use. Its processes and equipment such as figure 1 Shown, among them, 1 is NaBH 4 Solution, 2 is peristaltic pump, 3 is mixer, 4 is FeCl 3 solution, 5 is a vacuum f...

Embodiment 2

[0032] with FeCl 3 .6H 2 O and deionized water to prepare FeCl with a concentration of 0.045 mol / L 3 solution, stirred at 700 rpm for 10 min; then with NaBH 4 Prepare the same FeCl with deionized water 3 An equal volume of NaBH with a concentration of 0.25 mo / L 4 solution, pump FeCl at a rate of 60 mL / min with a constant flow pump 3 solution; after adding NaBH 4 At the same time as the solution, use an electric stirrer to stir the mixed solution at a speed of 700 rpm; 4 The solution is all pumped into FeCl 3 After solution, continue stirring for 15 min to make NaBH 4 with FeCl 3The mixed reaction is complete; let it stand for 15 minutes, and use double-layer medium-speed filter paper to vacuum filter to obtain zero-valent nano-iron with a moisture content of 65.43%. Nitrogen, store below 5 ℃ for future use. Its technique and equipment are with embodiment 1.

[0033] Then, sodium polystyrene sulfonate and the above-prepared zero-valent nano-iron were dissolved in deo...

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Abstract

The invention discloses a preparation method of modified zero-valence nano-iron suspension suitable for underground water pollution in-situ remediation, and particularly relates to a process for performing modification through unmodified zero-valence nano-iron with small particle size and high activity. Through the composite zero-valence nano-iron modified by sodium polystyrene sulfonate, the zero-valence nano-iron can be stably dispersed and migration of the zero-valence nano-iron in underground water can be promoted under the condition of maintaining zero-valence reaction activity, thereby saving the investment and the engineering cost of the zero-valence nano-iron. According to the method, not only the zero-valence nano-iron can be stably dispersed, but also the migration of the modified zero-valence nano-iron is promoted; and the method has the advantages of less using amount of a dispersing agent and low cost.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method for preparing modified zero-valent nanometer iron suitable for groundwater treatment. Background technique [0002] Due to the smaller diameter of colloids and unique molecular or atomic structures, nanomaterials exhibit distinctive mechanical, magnetic, optical, electrical, catalytic and chemical properties, making them useful in machinery, energy, optics, electronics, drug delivery, and medical treatment. There are huge potential applications in diagnostics. The huge specific surface area of ​​nanomaterials makes them have amazing surface and quantum effects. As the particle size decreases, the number of atoms at and near the surface increases. Due to the higher surface energy of the surface atoms, the surface atoms have more unsaturation or free bonds. Therefore, in order to obtain surface stability, surface atoms have a strong tendency to interact, ads...

Claims

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Application Information

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IPC IPC(8): C02F1/70
Inventor 李筱琴殷其亮雷蕾肖阳
Owner SOUTH CHINA UNIV OF TECH
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