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Method for preparing nanoscale zero-valent iron loaded on surfaces of glass beads by virtue of layer-by-layer assembly

A technology of nano-zero-valent iron and glass microbeads, which is applied in the direction of nanotechnology, can solve the problems that inorganic synthesis has not been developed, and achieve the effect of controllable activity

Inactive Publication Date: 2013-03-27
WUXI HUANCHUANG ENVIRONMENT TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has been widely used in the fields of biomolecular embedding, enzyme immobilization and drug release, but has not been developed in inorganic synthesis.

Method used

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  • Method for preparing nanoscale zero-valent iron loaded on surfaces of glass beads by virtue of layer-by-layer assembly
  • Method for preparing nanoscale zero-valent iron loaded on surfaces of glass beads by virtue of layer-by-layer assembly
  • Method for preparing nanoscale zero-valent iron loaded on surfaces of glass beads by virtue of layer-by-layer assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Prepare 0.1mol / L HCl and NaOH solution and 10mmol / L NaBH in advance 4 Solution, 5:1:1 (volume ratio) H 2 O / H 2 o 2 (30wt%) / HCl (36wt%) mixed solution and 5:1:1 (volume ratio) H 2 O / H 2 o 2 (30wt%) / NH 4 · OH (25wt% ~ 28wt%) mixed solution.

[0040] 1. Prepare PAA and PAH solutions with a concentration of 1g / L and 0.1mol / L FeSO 4 solution, and adjust the pH to 3.5 with 0.1mol / L HCl and NaOH solution.

[0041] 2. Preheat the ultrasonic machine to 70C, weigh 200 mesh glass beads and immerse them in 5:1:1 (volume ratio) H 2 O / H 2 o 2 / HCl mixed solution, sonicate at 70°C for 10 minutes, pour out the waste liquid after taking it out, wash with water 3 times, 2 minutes each time.

[0042] 3. Immerse in 5:1:1 (volume ratio) H 2 O / H 2 o 2 / NH 4 ·OH mixed solution, sonicate at 70°C for 10 minutes, pour out the waste liquid after taking it out, wash with water 3 times, 2 minutes each time.

[0043] 4. Immerse in 1g / L PAH for 5 minutes, wash with water 3 times, 2 m...

Embodiment 2

[0052] Example 2 Test of reducing ability of trichlorethylene (TCE).

[0053] Comparing nano-sized zero-valent iron synthesized by layer-by-layer assembly and ordinary zero-valent iron (nano-iron powder, 99.9%, 50nm, Aladdin’s reagent, http. / / www.aladdin-reagent.com / thir.asp? Rea_SubID=10750 ) to the reduction efficiency of TCE. React in a 40mL headspace bottle, isolate oxygen, trichlorethylene concentration 10mg / L, self-assemble nano zero-valent iron layer by layer under the condition of pH 3.5, 15 layers of polyelectrolyte, and 9 layers of assembled iron. During the reaction, it was placed in a shaker with a rotation speed of 80 rpm. At each time point, 250 μl samples were taken, and the concentration of trichlorethylene was detected by gas chromatography (HP-5890). This reaction obeys the first-order kinetics reaction, and the results of changing various reaction conditions are as follows: Image 6 . In the same reaction system, the reaction rate constant obtained by ...

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Abstract

The invention belongs to the field of inorganic synthesis, and discloses a method for preparing nanoscale zero-valent iron loaded on the surfaces of glass beads by virtue of layer-by-layer assembly. The method disclosed by the invention comprises the following steps of: using the glass beads as carriers and pre-treating the glass beads, so as to carry negative charges on the surfaces of the carriers, thus facilitating loading a polyelectrolyte and iron; and quantitatively loading ferrous ions on the surfaces of the carriers by virtue of the layer-by-layer self-assembly technology at first, and then reducing the ferrous ions into zero-valent iron by virtue of NaBH4. According to the method disclosed by the invention, the loading capacity and the size of the nanoscale zero-valent iron can be accurately controlled, and the reaction activity of the zero-valent iron can be effectively enhanced.

Description

technical field [0001] The invention belongs to the field of inorganic synthesis, and relates to a method for preparing nanometer zero-valent iron loaded on the surface of glass microspheres by layer-by-layer assembly. Background technique [0002] Zero-valent iron (ZVI) has strong reducing properties and is used in the field of environmental engineering to treat a variety of organic pollutants. Nano-zero-valent iron (NZVI) refers to zero-valent iron particles with a particle size in the range of 1-100nm, which is characterized by a large specific surface area. According to calculations, the specific surface area of ​​nano-iron is 33.5m 2 / g, while ordinary iron powder is only 0.9m 2 / g. Due to the surface effect of nanomaterials, the number of active centers increases with the increase of surface area, so nano-iron exhibits stronger reducibility [5] , has unique advantages and broad application prospects in the field of soil and groundwater remediation. However, the pow...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 陆隽鹤宦志荣
Owner WUXI HUANCHUANG ENVIRONMENT TECH DEV
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