Preparation method and application of nanoscale zero-valent iron-beta zeolite new composite nano material

A technology of composite nanomaterials and nano-zero-valent iron, which is applied in chemical instruments and methods, adsorption water/sewage treatment, ion-exchange water/sewage treatment, etc., can solve the problems of easy agglomeration and poor diffusion performance, and achieve popularization and The effect of promotion, low cost, and uniformity improvement

Inactive Publication Date: 2014-10-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention mainly aims at the shortcomings of nano zero-valent iron materials such as easy agglomeration and poor diffusion performance caused by magnetic force and van der Waals force, etc., by loading nano zero-valent iron on beta...

Method used

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  • Preparation method and application of nanoscale zero-valent iron-beta zeolite new composite nano material
  • Preparation method and application of nanoscale zero-valent iron-beta zeolite new composite nano material
  • Preparation method and application of nanoscale zero-valent iron-beta zeolite new composite nano material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 1.622 g of anhydrous ferric chloride in 100 mL of deionized water and stir thoroughly; weigh 1 g of β zeolite dissolved in 5 mL of deionized water for 5 minutes, add the ferric chloride aqueous solution, and use a mechanical stirring device to Stir at rpm for 16 hours; divide the mixed solution into 50 mL centrifuge tubes and centrifuge at 6000 rpm for 2 minutes; pour the supernatant into the storage device for later use, take the bottom centrifuged solid and dissolve it in 100 mL of deionized water and fully agitate to disperse; weigh 2 g of sodium borohydride (China National Pharmaceutical Analytical Pure,> 96%), dissolved in 100 mL of deionized water, and after it is fully dissolved, add it dropwise to the dispersed solution of iron ions and β zeolite with a peristaltic pump speed of 2.0 on the 16th pump tube. The whole process is accompanied by 600 revolutions. / Min mechanical stirring; after the dripping, continue to stir the reaction for 30 minutes to make ...

Embodiment 2

[0029] In this preparation, the concentrations of three iron ions (0.1 M, 0.2 M, 0.3 M) were set and the amount of β zeolite was kept unchanged, in order to compare the difference in the performance of materials prepared with different ratios of iron ions and β zeolite. Except for the initial iron ion concentration, the remaining steps are the same as in Example 1.

Embodiment 3

[0030] Example 3: Nano zero-valent iron-β zeolite to remove antimony-containing wastewater

[0031] The antimony-containing wastewater here uses potassium antimony tartrate as the source of the contaminant antimony, and different concentrations of antimony-containing wastewater are obtained by diluting a 1 g / L antimony stock solution. In the process of studying the adsorption isotherm, the initial concentration of antimony was 20, 60, 100, 140, 180, 220 mg / L, the reaction temperature was 25, 35, 45 ℃, and the reaction time was 3 hours. The dosage of -β zeolite is 1 g / L, the reaction device is a 50 mL brown bottle, the solution volume is 40 mL, the reaction is carried out in a shaker, and the rotation speed is 200 rpm. During the kinetic study, the initial concentration of antimony was 20 mg / L, the dosages of nano-zerovalent iron-β zeolite were 1, 2, 3 g / L, and 1 g / L β zeolite was used as In contrast, the reaction vessel is a three-necked flask, the solution volume is 200 mL, ni...

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Abstract

The invention relates to a preparation method and application of a nanoscale zero-valent iron-beta zeolite new composite nano material, an iron source is Fe<2+> or Fe<3+> iron containing compounds (such as anhydrous ferric chloride, ferrous sulfate, and the like), and a loading base is beta zeolite with total ion exchange capacity. The preparation is characterized in that a loading base material is fully dispersed and iron ions and the loading base are uniformly combined through the long time reaction under ultrasonic synergistic effect, free iron ions in the solution are removed by centrifugation, the iron-containing solution is recycled, the homogeneity of the properties of the synthetic material system is enhanced, iron ions absorbed on the loading base surface are reduced under the function of sodium borohydride, and anhydrous ethanol is used for cleaning and storage. The preparation method has the advantages of being low in cost, convenient, fast, low in technical threshold, and in favor of the popularization and promotion, and nano zero valent iron particles in the synthetic material are smaller, is not easy to agglomerate and have very good removal effect on heavy metal pollutant stibonium and the like difficult to remove in the environment.

Description

technical field [0001] The invention relates to a method and application for modifying nanometer zero-valent iron by using a novel carrier material. Background technique [0002] As an environmental nanomaterial, nano-zero-valent iron has been widely used in the field of groundwater and other environmental restoration due to its advantages such as large specific surface area, high reactivity, and strong ability to remove pollutants. The nano-zero-valent iron synthesized in the laboratory has a spherical structure with an average size of 60 nm, and 80% of the particle size is between 50-100 nm. Nano-zero-valent iron has a core-shell double structure, the core is solid zero-valent iron Fe0, which is a diffusion ring structure of metallic iron body-centered cubic crystal, surrounded by a thin layer of oxide shell FeOOH, and the thickness of the shell is mostly 2- 4nm. Due to the magnetic and electrostatic attraction, nano-zero-valent iron is easy to form a chain structure, of...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/42C02F1/62B22F9/24
Inventor 代朝猛张亚雷周哲周雪飞
Owner TONGJI UNIV
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