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Method of adopting laminar duplex-metal hydroxide to recycle heavy metal ions in sewage

A layered bimetallic and heavy metal ion technology, applied in chemical instruments and methods, nickel oxide/nickel hydroxide, aluminum oxide/aluminum hydroxide, etc., to achieve good application prospects, fast adsorption rate, and uniform structure

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to develop a new application method that uses layered double metal hydroxide as an adsorbent and recycles heavy metals in sewage for the problems that need to be improved in the practical application of heavy metal sewage treatment

Method used

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  • Method of adopting laminar duplex-metal hydroxide to recycle heavy metal ions in sewage
  • Method of adopting laminar duplex-metal hydroxide to recycle heavy metal ions in sewage
  • Method of adopting laminar duplex-metal hydroxide to recycle heavy metal ions in sewage

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Prepare 0.375mol / L Mg(NO 3 ) 2 ·6H 2 O and 0.125mol / L Al(NO 3 ) 3 9H 2 O mixed salt solution 100ml, prepare 100ml of sodium hydroxide and 0.3mol / L sodium nitrate mixed alkaline solution with deionized water. The mixed salt solution and the mixed alkali solution are dropped into the reaction vessel at the same time, and the pH is controlled to be 9.5-10. The reaction was vigorously stirred at room temperature for 8 h, during which time N 2 Protected, then centrifuged under the condition of 3500r / min, washed three times with deionized water, washed once with absolute ethanol, and dried to obtain layered double metal hydroxide. The chemical formula of the obtained layered double metal hydroxide is [Mg 0.75 2+ Al 0.25 3+ (OH) 2 ](NO 3 ) 0.25 1.5H 2 O.

[0020] Cd 2+ Solution preparation: The country allows Cd that can discharge wastewater 2+ The concentration is 0.1mg / L, and the concentration of the solution to be tested is 10% of the national emission stan...

Embodiment 2

[0024] Using Ni(NO 3 ) 2 ·6H2 O replaces Mg(NO 3 ) 2 ·6H 2 O, all the other conditions are the same as in Example 1, and the preparation of chemical formula is [Ni 0.75 2+ Al 0.25 3+ (OH) 2 ](NO 3 ) 0.25 1.5H 2 layered double hydroxides of O, and Ni in the same way 2+ Adsorption, using ICP (plasma emission spectrometer) to measure Ni in the sample liquid to be tested 2+ The adsorption capacity was 58 mg / g. The adsorption product was calcined at 450°C to obtain a composite metal oxide. It also has obvious ultraviolet absorption performance in the range of λ<500nm.

Embodiment 3

[0026] Prepare 0.375mol / L Mg(NO 3 ) 2 ·6H 2 O and 0.125mol / L Al(NO 3 ) 3 9H 2 O mixed salt solution 100ml, prepare 100ml of sodium hydroxide and 0.3mol / L sodium carbonate mixed alkaline solution with deionized water. The mixed salt solution and the mixed alkali solution are dropped into the reaction vessel at the same time, and the pH is controlled to be 9.5-10. Vigorously stirred and reacted at room temperature for 8 hours, then centrifuged at 3500 r / min, washed three times with deionized water, once with absolute ethanol, and dried to obtain a layered double metal hydroxide. The chemical formula of the obtained layered double metal hydroxide is [Mg 0.75 2+ Al 0.25 3+ (OH) 2 ](CO 3 ) 0.125 2H 2 O.

[0027] Ni 2+ Solution preparation: The country allows Ni that can discharge waste water 2+ The concentration is 0.5mg / L, and the concentration of the solution to be tested is 200 times that of the national discharge standard, that is, 0.5mg / L*200=0.1g / L, and 0.25g ...

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Abstract

The invention discloses a method of adopting a laminar duplex-metal hydroxide to recycle heavy metal ions in sewage, belonging to the technical field of recycling of heavy metal in the sewage. After the laminar duplex-metal hydroxide is adopted to adsorb heavy metal ions, the heavy metal ions or macromolecule organic groups are adhered to the surface of a hydrotalcite; a few heavy metal ions or macromolecule organic groups enters into the intervals of laminates, and the heavy metal ion eliminating operation can be realized by simple precipitating and filtering operations. The laminar duplex-metal hydroxide has the advantages of low cost and fast absorption speed, thus the situation that the processing solution after the absorption is polluted again can not happen. Through recycling absorbed products, a composite metal oxide with uniform chemical composition and structure and favorable photoelectric performance can be obtained by a solid phase sintering technique. Therefore, the research on the application of the hydrotalcite in the sewage treatment has large practical meaning, and the method of adopting laminar duplex-metal hydroxides to recycle heavy metal ions in the sewage has favorable application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling heavy metals in sewage, in particular to a method for recycling heavy metal ions in sewage by using layered double metal hydroxides. technical background [0002] Industry standards define metals with densities greater than 4 or 5 as heavy metals. Common heavy metals include Pb, Zn, Ni, Cd, Cu, etc. Except for a few such as Mn, Zn, and Cu, most of the heavy metal elements are meaningless to life activities. When the content of heavy metals accumulates to a certain extent, it will cause great harm to the animal body. Heavy metals widely exist in nature at natural concentrations that are harmless to humans. However, due to the unreasonable mining and application of heavy metals by humans, heavy metals such as Pb, Ni, Hg, and Cd are deposited in the atmosphere, soil, and water resources. , and after reaching a certain amount of deposition, it has caused pollution and damage to these environmental...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62B01J20/08C01F7/02C01G53/04
Inventor 路艳罗陈阳
Owner BEIJING UNIV OF CHEM TECH
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