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Preparation method and application of nano-silica introduced magnetic vulcanized nanometer zero-valent iron

A nano-silica, nano-zero valent iron technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of difficult separation, non-magnetic, easy to oxidize, etc., to achieve synthesis The method is simple and fast, the chemical properties are stable, and the removal ability is improved.

Inactive Publication Date: 2015-04-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is mainly aimed at the difficulties in nucleation of initial zero-valent iron caused by the increase of ferrous sulfide content during the synthesis process of sulfide nano-zero-valent iron, the synthetic material does not have the structure of ferrous sulfide-wrapped zero-valent iron, and the material is floc-like and non-magnetic , easy to oxidize, difficult to separate, etc.

Method used

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  • Preparation method and application of nano-silica introduced magnetic vulcanized nanometer zero-valent iron
  • Preparation method and application of nano-silica introduced magnetic vulcanized nanometer zero-valent iron
  • Preparation method and application of nano-silica introduced magnetic vulcanized nanometer zero-valent iron

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Embodiment 1

[0024] Weigh 9.6 g of ferric chloride containing six crystal waters and dissolve it in 500 ml of deionized water, use mechanical stirring, and continuously stir at 1200 rpm; weigh 1 g of sodium persulfate and 7.6 g of sodium borohydride Dissolve in 500 ml of deionized water, stir mechanically at 250 rpm, and add 0.4 ml of silica suspension with a mass fraction of 30% and an average particle size of 120 nm; the latter is pumped to Add it dropwise into the ferric chloride solution at a flow rate of 0.8 L / min, and the whole process lasts for 38 min; after the reaction, continue to stir for 8 min, use a magnet to complete solid-liquid separation, wash with deionized water and absolute ethanol three times, and store in In 20% ethanol solution, the concentration of wet nanomaterials was 30 g / L. The material was carefully analyzed using a transmission electron microscope (with electron spectrometer attached), figure 1 is a representative picture of the nanomaterial, figure 2 V...

Embodiment 2

[0026] In this preparation, different volumes of nano-silicon peroxide (0.2, 0.4, 0.6, 0.8 ml) suspensions were selected, and the rest of the synthesis conditions were unchanged. 3-FeSSi, 4-FeSSi) have different removal abilities for metal cadmium ions. Experimental results such as Figure 4 As shown, it can be seen that the material synthesized by adding 0.4 ml nano-silica suspension has the highest ability to remove cadmium ions.

Embodiment 3

[0027] Example 3 Heavy metal wastewater treatment

[0028] According to the removal effect of metal cadmium ions of different materials in Synthesis Example 2, the volume of nano-silicon dioxide suspension added was selected to be 0.2 ml synthetic material and used in this example and subsequent examples. Wastewater containing lead, cadmium, nickel, copper, and cobalt was prepared using lead acetate, cadmium acetate, nickel chloride, copper chloride, and cobalt chloride as pollutant sources, and tap water was used as a solvent to prepare respectively, and the concentration of each pollutant was 50 mg. / L. Add 100 ml of wastewater into 100 ml glass bottles with stoppers (each wastewater contains 3 parallel samples), add 1.67 ml of nanomaterials with a wet concentration of 30 g / L, and the actual concentration of nanomaterials is 500 mg / L, Stoppered and placed in a constant temperature shaker, the reaction temperature was set at 25°C, the shaker speed was 200 rpm, and the reac...

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Abstract

The invention relates to a preparation method of nano-silica introduced magnetic vulcanized nanometer zero-valent iron. The preparation method comprises the concrete steps: (1) adding sodium borohydride and sodium persulfate into water to form a mixed solution; (2) adding nano-silica into a solution containing sodium borohydride and sodium persulfate and continuously stirring; (3) slowly dropwise adding a suspension formed in the second step under the stirring condition into a ferric salt solution by virtue of a peristaltic pump; and (4) after reaction is finished, carrying out solid-liquid separation by utilizing a magnet, respectively cleaning twice by adopting deionized water and anhydrous alcohol, and finally directly storing into a deionized water-alcohol solution, or vacuum drying and then storing in an anaerobic glove box. The invention also discloses environment repairing application of the nano-silica introduced magnetic vulcanized nanometer zero-valent iron. The preparation method is convenient and rapid and is low in cost and technical requirements; the material synthesized by the preparation method has the characteristics of both nanometer zero-valent iron and nanometer ferrous sulfide, is capable of solving the problems that the synthesized material is nonmagnetic, easily oxidized and difficultly applied in the absence of nano-silica, is excellent in inorganic and organic pollutant removing performances and has wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a preparation method and application of magnetic vulcanized nano zero-valent iron induced by nano silicon dioxide. Background technique [0002] Nano-zero-valent iron has been widely accepted as an efficient environmental remediation material. It has a large specific surface area and high reactivity, and has gained important applications in the field of in-situ remediation of organic pollution in groundwater. Nano-zero-valent iron has a structure with zero-valent iron as the core and iron oxide as the shell. The reducing power provided by zero-valent iron is the basis for degrading organic pollutants. More and more) impede the transfer of electrons, which in turn leads to the termination of the reaction. On the other hand, in order to enhance the reactivity of nano-zero-valent iron, loading noble metals as catalysts is a common technical mean...

Claims

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Application Information

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IPC IPC(8): B01J27/043C02F1/58C02F1/62C02F101/38C02F101/36C02F101/20
Inventor 张亚雷苏益明
Owner TONGJI UNIV
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