Preparation method of high-selectivity amino-functionalized mesoporous gamma-aluminum oxide-based composite adsorbent

A technology of amino functionalization and composite adsorption, which is applied in the direction of chemical instruments and methods, alkali metal compounds, adsorption water/sewage treatment, etc., can solve the problems of long time consumption and environmental friendliness reduction, achieve short time consumption and increase adsorption capacity And the effect of selectivity and good recycling performance

Inactive Publication Date: 2017-03-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is time-consuming, and the preparation process needs to be fed with N under heating conditions. 2 , and the use of toxic solvent toluene, the environmental friendliness has been reduced

Method used

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  • Preparation method of high-selectivity amino-functionalized mesoporous gamma-aluminum oxide-based composite adsorbent
  • Preparation method of high-selectivity amino-functionalized mesoporous gamma-aluminum oxide-based composite adsorbent
  • Preparation method of high-selectivity amino-functionalized mesoporous gamma-aluminum oxide-based composite adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 1 g of P123 in 20 ml of ethanol at room temperature with thorough stirring. Next, add 1.6ml of 67%wt concentrated nitric acid, stir and mix evenly at room temperature. Then, 2.04 g of aluminum isopropoxide was added, and the mixture was fully stirred for 5 h at room temperature to obtain a solution. Put the above solution in an oven at 60°C, induce solvent evaporation for 48 hours to obtain a gel, and bake the gel at 600°C (heating rate 1°C / min) for 4 hours to obtain mesoporous γ-Al 2 o 3 Original powder. Further, at room temperature, 1 g of mesoporous γ-Al2 o 3 The former powder is dispersed in 30ml ethanol, under the stirring of 1500rpm, add dropwise 0.5g, the N-beta-(aminoethyl)-gamma-aminopropylmethyldimethoxysilane that mass concentration is 99%, at room temperature After fully stirring for 1 h, the diamino-functionalized mesoporous γ-Al was prepared by centrifugation, washing with ethanol and drying at 120 °C for 2 h. 2 o 3 base composite adsorbent....

Embodiment 2

[0035] Dissolve 1 g of P123 in 20 ml of ethanol at room temperature with thorough stirring. Next, add 1.6ml of 67%wt concentrated nitric acid, stir and mix evenly at room temperature. Then, 2.04 g of aluminum isopropoxide was added, and the mixture was fully stirred for 5 h at room temperature to obtain a solution. Put the above solution in an oven at 60°C, induce solvent evaporation for 48 hours to obtain a gel, and bake the gel at 600°C (heating rate 1°C / min) for 4 hours to obtain mesoporous γ-Al 2 o 3 Original powder. Further, at room temperature, 1 g of mesoporous γ-Al 2 o 3 The original powder was dispersed in 30ml of ethanol, and 0.25g of N-aminoethyl-γ-aminopropyltrimethoxysilane with a mass concentration of 99% was added dropwise under stirring at 1500rpm. After fully stirring at room temperature for 12h, the Diamino-functionalized mesoporous γ-Al was prepared by centrifugation, washing with ethanol and drying at 130°C for 3 h 2 o 3 base composite adsorbent.

...

Embodiment 3

[0038] Dissolve 1 g of P123 in 20 ml of ethanol at room temperature with thorough stirring. Next, add 1.6ml of 67%wt concentrated nitric acid, stir and mix evenly at room temperature. Then, 2.04 g of aluminum isopropoxide was added, and the mixture was fully stirred for 5 h at room temperature to obtain a solution. Put the above solution in an oven at 60°C, induce solvent evaporation for 48 hours to obtain a gel, and bake the gel at 600°C (heating rate 1°C / min) for 4 hours to obtain mesoporous γ-Al 2 o 3 Original powder. Further, at room temperature, 1 g of mesoporous γ-Al 2 o 3 The former powder is dispersed in 30ml ethanol, under stirring at 1500rpm, add 1g dropwise, mass concentration is 99% 3-[2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane, at room temperature After fully stirring at high temperature for 6 h, it was centrifuged, washed with ethanol and dried at 110 °C for 1 h to prepare the triamino-functionalized mesoporous 2 o 3 base composite adsorbent. ...

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Abstract

The invention relates to a preparation method of a high-selectivity amino-functionalized mesoporous gamma-aluminum oxide-based composite adsorbent. The preparation method comprises the following steps: sequentially adding concentrated nitric acid and aluminum isopropoxide into a P123 ethanol solution under a room-temperature stirring condition, so as to form a solution; carrying out solvent induced evaporation on the solution to obtain gel, and roasting the gel to obtain mesoporous gamma-Al2O3 raw powder; and dropwise adding a certain amount of amino silane into the raw powder which is subjected to ethanol dispersion at room temperature, stirring for a certain period of time to obtain a product, and sequentially carrying out separation, ethanol washing and drying on the product, so as to obtain the gamma-Al2O3-based composite adsorbent. The preparation method has the beneficial effects that the preparation process is simple, and conditions are mild; the prepared composite adsorbent has an adsorption capacity of 67.0mg / g to highly toxic Cr(VI) and still has a removal rate above 99.9% after being circulated for three times; the adsorbent has very good selective adsorption performance to a Cr(VI), Cu(II), Zn(II), Ni(II) and Cd(II) mixed solution at different pH values; and the adsorbent has excellent adsorption performance to Cr(VI) in the respective presence of anions such as SO4<2>, HPO4<2>, NO3 and Cl.

Description

technical field [0001] The invention belongs to the technical field of the preparation of functionalized composite materials and its application in the adsorption and separation of toxic and harmful heavy metal ions, specifically a highly selective amino functionalized mesoporous γ-Al for the adsorption of toxic Cr(VI) 2 o 3 Preparation method of base composite adsorbent. Background technique [0002] Chromium has important economic value and is widely used in many industrial fields such as electroplating, printing and dyeing, leather tanning and smelting. Chromium in the water environment mainly exists in two valence states of Cr(III) and Cr(VI), among which Cr(VI) is carcinogenic and teratogenic, and its toxicity is far greater than that of Cr(III). Cr(VI) in water exists in the form of oxygen-containing anions such as chromate and dichromate, which will not only cause serious harm to human health, cause respiratory diseases, cause cancer, skin rashes, and cause liver da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/08B01J20/22B01J20/28083C02F1/288C02F2101/22
Inventor 蔡卫权靳欣
Owner WUHAN UNIV OF TECH
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