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Lamellar hydroxide composite material and preparation method thereof

A layered hydroxide, composite material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of limited application scope, lack of guest molecule selectivity, etc., to achieve good adsorption capacity and selectivity, high stability The effect of high specificity and high specific surface area

Inactive Publication Date: 2013-08-07
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Layered double metal hydroxide is a hydroxide with hydrotalcite layer structure composed of divalent metal ions and trivalent metal ions, also known as mixed metal hydroxide; layered double metal hydroxide has brucite Sheet structure, the laminate is positively charged due to the isomorphic replacement of divalent metal ions by trivalent metal ions, and the charge of the guest anion that can be exchanged between the layers is balanced with the positive charge of the laminate, making the layered double metal hydroxide an electric charge. Neutral, layered double metal hydroxide has a large anion exchange capacity (AEC, 2~3mep / g), and is easy to accept guest anions, so it can be used to adsorb metals and organic pollutants in the form of negative ions in water bodies , but this type of material lacks selectivity to guest molecules, which limits the range of applications
[0005] Layered rare earth hydroxides are a new type of inorganic layered functional materials with a layered structure. The main body is composed of hydroxides of rare earth metals. The type and quantity of anions can be adjusted, but there are no related reports on adsorbents

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  • Lamellar hydroxide composite material and preparation method thereof
  • Lamellar hydroxide composite material and preparation method thereof
  • Lamellar hydroxide composite material and preparation method thereof

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[0032] The present invention also provides a method for preparing the layered hydroxide composite material, including: A) mixing layered rare earth hydroxides, crown ether carboxylic acid derivatives, water and alkali metal hydroxides, and reacting to obtain layered hydroxide composite material.

[0033] All the raw materials of the present invention have no special limitation on their sources, they can be purchased on the market or made by themselves. The layered rare earth hydroxides and crown ether carboxylic acid derivatives are the same as those described above, and will not be repeated here.

[0034] The preparation methods of the layered rare earth hydroxides and crown ether carboxylic acid derivatives can be prepared by methods well known to those skilled in the art, and there is no special limitation.

[0035] The present invention mixes layered rare earth hydroxides, crown ether carboxylic acid derivatives and water under the action of alkali metal hydroxides, where...

Embodiment 1

[0046] 1.1 will 2g Gd 2 o 3 Dissolved in 20ml of 1:1 nitric acid, heated and evaporated, concentrated and crystallized to obtain Gd(NO 3 ) 3 ·6H 2 O.

[0047] 1.2 Add 0.451g (1mmol) of Gd(NO 3 ) 3 ·6H 2 O, 1.105g (13mmol) NaNO 3 Mix with 0.140g (1mmol) hexamethylenetetramine, add 80ml of exhausted water, pass nitrogen gas for 5min, heat to 90°C for hydrothermal reaction for 12h, filter with suction, wash with water for 3 times to obtain white powder layered gadolinium Hydroxide is NO 3 - -LGdH.

[0048] 1.3 After dissolving 16.0g NaOH with 200ml water, put it in a 500ml three-necked round-bottomed flask, add 13.5ml ethylenediamine, control the temperature of the water bath at 40°C-50°C, and add 80.0g p-toluenesulfonyl chloride in batches while stirring ( TsCl), after continuous stirring for 4 hours, add 50ml of ethanol, heat up to 90°C, stop the reaction after reflux for 5min, cool to room temperature, filter with suction, wash the product three times with distilled...

Embodiment 2

[0061] Mix 0.075g (0.11mmol) of 4,7,13,16-tetracarboxyethyl-1,10-dioxo-4,7,13,16-tetraazacycloctadecane obtained in 1.6, 80ml of distilled water with Mix 0.77mmol sodium hydroxide, then add 0.10g of NO obtained in 1.2 3 - -LGdH, the pH value of the solution is about 9.38, stirred at room temperature for 24 hours, filtered by suction, and dried in vacuum to obtain a layered hydroxide composite material.

[0062] Utilize X-ray diffractometer to analyze the layered hydroxide composite material obtained in embodiment 2, obtain its X-ray diffraction pattern as figure 1 Shown, wherein c is the layered hydroxide composite material obtained in Example 2.

[0063] Utilize infrared spectrometer to analyze the layered hydroxide composite material obtained in embodiment 2, obtain its infrared spectrogram, as figure 2 shown. where c is the layered hydroxide composite obtained in 1.7.

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Abstract

The invention provides a lamellar rare earth hydroxide composite material. The lamellar rare earth hydroxide composite material is prepared by carrying out a reaction on lamellar rare earth hydroxide and crown ether carboxylic acid derivatives. In comparison with the prior art, the lamellar hydroxide composite material is compounded from the lamellar rare earth hydroxide and a crown ether compound. Firstly, the lamellar rare earth hydroxide composite material has the advantages of high specific surface area, porosity and high stability of the lamellar rare earth hydroxide, so that heavy metal ion in water can be absorbed; and secondly, the lamellar rare earth hydroxide composite material has the characteristics of softness and high selectivity to object ions of the organic macrocyclic crown ether compound. Thus, the lamellar rare earth hydroxide composite material can overcome the defects and develop the advantages, and has high adsorption capacity and selectivity to heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of new materials and water pollution treatment agents, and in particular relates to a layered hydroxide composite material and a preparation method thereof. Background technique [0002] my country is one of the thirteen water-poor countries in the world due to its large population and lack of water resources. The per capita water resources are only 1 / 4 of the world average. With the rapid development of industrial and agricultural economy, the discharge of wastewater is increasing day by day. Industrial wastewater has complex components and contains a large number of available resources. Among them, heavy metal ions are highly valued because of their own pollution characteristics and great harm to the environment. In order to separate and enrich heavy metal ions in wastewater and realize the dual effects of resource recovery and environmental protection, research on materials for adsorbing heavy metal ions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30
Inventor 马淑兰谷庆阳李伟丽孙亚红
Owner BEIJING NORMAL UNIVERSITY
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