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An organic-inorganic hybrid material for processing heavy metals and its preparation method

A technology of hybrid materials and heavy metals, which is applied in the fields of silicon organic compounds, chemical instruments and methods, water/sewage treatment, etc., can solve the problems such as the inability to achieve selective adsorption, the inability to selectively adsorb Cr, and the inability to achieve effective separation.

Active Publication Date: 2019-06-25
山西交控生态环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the above method are: 1. It is impossible to selectively adsorb Cr(Ⅵ) or Re(VII)
Due to the existence of various anions in the water body in the environment, especially SO 4 2- etc. with CrO 4 2- 、Cr 2 o 7 2- 、ReO 4 - Anion-like structure, precipitation method, adsorption method, reduction fixation method can not achieve the selective adsorption of Cr(Ⅵ) or Re(VII); 2. There is an adsorption-desorption equilibrium of Cr(Ⅵ) or Re(VII), Cannot achieve effective separation
The adsorption method and ion exchange method have adsorption equilibrium between the adsorption material and the Cr(VI) or Re(VII) anion in the water body, and cannot effectively fix it.

Method used

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  • An organic-inorganic hybrid material for processing heavy metals and its preparation method
  • An organic-inorganic hybrid material for processing heavy metals and its preparation method
  • An organic-inorganic hybrid material for processing heavy metals and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] First add 20g of sodium iodide to 70g of diethylamine, after mixing evenly, raise the temperature to 100°C under the protection of nitrogen, then slowly add 208g of 3-chloropropyltriethoxysilane to diethylamine and sodium iodide In the mixture, react for 8 hours, cool down to room temperature; add 47g of sodium methoxide, and remove methanol by distillation under reduced pressure after reacting for 2 hours; slowly add 208g of 3-chloropropyltriethoxysilane again, and react at 100°C under nitrogen protection for 10 hour, filtered, and the filtrate was distilled off under reduced pressure to remove the solvent, and then recrystallized with acetone / ether mixed solvent to obtain bis(3-(triethoxysilyl)propyl)diethylammonium chloride, which was dried for future use.

[0027] The pyrite powder was ground to 100 mesh under the protection of inert gas. Wash with hydrochloric acid ethanol solution and absolute ethanol, and vacuum dry in an inert gas environment.

[0028] Add 20g ...

Embodiment 2

[0031] Concrete steps are identical with embodiment 1. But the pyrite powder is 10 mesh. The hybrid material has a removal rate of 19% for Cr(Ⅵ) and 14% for Re(VII).

Embodiment 3

[0033] Concrete steps are identical with embodiment 2. However, in the preparation step of the organic-inorganic hybrid material, pyrite powder was reacted with silylated dialkyl quaternary ammonium salt and tetraethyl orthosilicate at 30° C. for 48 hours. The hybrid material has a removal rate of 21% for Cr(Ⅵ) and 15% for Re(VII).

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Abstract

The invention discloses an organic-inorganic hybrid material for treating a heavy metal. The organic-inorganic hybrid material is formed by hydrolyzing a silane dialkyl quaternary ammonium salt and tetraethoxysilane and coating the surface of pyrite. The structural formula of the organic-inorganic hybrid material is as shown in the specification, wherein n is equal to 2 or 4. The organic-inorganic hybrid material has the advantages of selective adsorption on Cr or Re heavy metal and a good treatment effect.

Description

technical field [0001] The invention belongs to the technical field of heavy metal treatment in water, and in particular relates to an organic-inorganic hybrid material for treating Cr(VI) and Re(VII) heavy metals in water and a preparation method thereof. Background technique [0002] Chromium (Cr) is one of the heavy metals widely used in electroplating, dye, leather and alloy industries. The discharge of Cr-containing wastewater, the discharge of Cr slag, and the percolation of Cr slag heaps in the above industries are important causes of Cr pollution in the water environment. Cr exists mainly in the form of Cr(VI) and Cr(III) in the environment. Among them, Cr(Ⅵ) is highly toxic and is one of the internationally recognized carcinogenic metals. my country's "Sewage Comprehensive Discharge Standard (GB 8978-1996)" stipulates that Cr(Ⅵ) is the first type of pollutant, and the maximum allowable discharge concentration is 0.5mg / L. Therefore, the treatment of Cr(Ⅵ) in water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/21B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/0285B01J20/22C02F1/288C02F2101/20C07F7/21
Inventor 李一菲钱天伟刘晓娜王婷
Owner 山西交控生态环境股份有限公司
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