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Preparation method of amino-functionalization mesoporous gamma-Al2O3 absorbent

A technology of amine-based functions and adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as poor acid and alkali resistance, harsh conditions, toxic prices, etc., and achieve adsorption kinetics Fast, mild impregnation conditions, large adsorption effect

Inactive Publication Date: 2013-11-27
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 has the serious disadvantages of many steps, complex process, harsh conditions and toxic organic solvents such as toluene.
Recently, CN103071449A disclosed a method for adsorbing Cr(VI) and CO 2 The preparation and use method of the amino-functionalized mesoporous alumina-based bifunctional adsorbent, but the aluminum source it adopts is toxic and expensive aluminum isopropoxide, and the prepared alumina is actually uncalcined oxidized Aluminum hydrate has poor acid and alkali resistance stability, so the patent application does not mention its cycle regeneration adsorption performance

Method used

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  • Preparation method of amino-functionalization mesoporous gamma-Al2O3 absorbent
  • Preparation method of amino-functionalization mesoporous gamma-Al2O3 absorbent
  • Preparation method of amino-functionalization mesoporous gamma-Al2O3 absorbent

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Experimental program
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Effect test

Embodiment 1

[0035] First, fully stir at room temperature, dissolve 3g of F127 in 40ml of ethanol, and add 40ml of dilute nitric acid made of 0.68ml, 65wt% concentrated nitric acid to 3g of Shandong Senchi pseudo-boehmite, degumming for 1h, in Stir them at room temperature to mix well. Then, the above solution was put into an oven at 60°C, evaporated at constant temperature for 24 hours, then dried in vacuum at 80°C, and finally roasted at 500°C for 4 hours to obtain the product, which was analyzed by X-ray powder diffraction (X-ray diffraction, XRD) as γ -Al 2 o 3 Phase, N 2 The specific surface area of ​​adsorption-desorption test is 262.6m 2 / g, the pore volume is 0.96cm 3 / g, the average pore diameter is 14.6nm.

[0036] Application: Prepare 100ml, 50mg / L Cr(VI) solution with potassium dichromate, and adjust its pH to 3.0 with hydrochloric acid solution, then add 0.1g of the above-mentioned adsorbent under medium-intensity stirring, and after reaching adsorption equilibrium for a ...

Embodiment 2

[0038] First, fully stir at room temperature, dissolve 3g of F127 in 40ml of ethanol, and add 40ml of dilute nitric acid made of 0.68ml, 65wt% concentrated nitric acid to 3g of Shandong Senchi pseudo-boehmite, degumming for 1h, Stir them at room temperature to mix well. Then, the above solution was put into an oven at 60°C, evaporated at a constant temperature for 24 hours, then dried in vacuum at 80°C, and finally roasted at 500°C for 4 hours to obtain the product, which was γ-Al by XRD analysis. 2 o 3 Phase, N 2 Adsorption-desorption test has a specific surface area of ​​191.2m 2 / g, the pore volume is 0.77cm 3 / g, the average pore diameter is 14.4nm. Further, 0.1111g PEI was dissolved in 1.8ml ethanol under shaking at room temperature to form a PEI ethanol solution, and 1g mesoporous γ-Al was added 2 o 3 The powder was impregnated in equal volume at room temperature, and after standing for 24 hours, it was dried in vacuum at 80°C for 24 hours to prepare a composite ad...

Embodiment 3

[0041] First, fully stir at room temperature, dissolve 3g of F127 in 40ml of ethanol, and add 40ml of dilute nitric acid made of 0.68ml, 65wt% concentrated nitric acid to 3g of Shandong Senchi pseudo-boehmite, degumming for 1h, Stir them well at room temperature. Then, the above solution was put into an oven at 60°C, evaporated at a constant temperature for 24 hours, then dried in vacuum at 80°C, and finally roasted at 500°C for 4 hours to obtain the product, which was γ-Al by XRD analysis. 2 o 3 Phase, N 2 Adsorption-desorption test has a specific surface area of ​​247.2m 2 / g, the pore volume is 0.71cm 3 / g, and the average pore diameter is 11.4nm. Further, 0.1111g of TEOA was dissolved in 1.8ml of ethanol under shaking at room temperature to form an ethanol solution of TEOA, and then 1g of mesoporous γ-Al was added 2 o 3 The powder was impregnated in equal volume at room temperature, and after standing for 24 hours, it was vacuum-dried at 80°C for 24 hours to prepare ...

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Abstract

The invention discloses a preparation method and application of an amino-functionalization mesoporous gamma-Al2O3 absorbent. The method comprises the following steps of firstly, adding a dilute nitric acid into an ethanol solution of a Pluronic triblock copolymer P123, F127 or a mixture of the Pluronic triblock copolymer P123 and the F127 to peptize an industrial pseudo-boehmite solid to obtain a sol, uniformly stirring the sol, evaporating a solvent at the constant temperature, inducing self-assembly, carrying out vacuum drying, and roasting to obtain mesoporous gamma-Al2O3; then, carrying out equivalent-volume impregnation on the prepared mesoporous gamma-Al2O3 by using an ethanol solution of tetraethylenepentamine, polyethyleneimine, triethanolamine or 2-amino-2-methyl-1-acetone; and finally, carrying out vacuum drying to obtain the adsorbent. The amino-functionalization mesoporous gamma-Al2O3 absorbent prepared by the invention has favorable adsorption performance for a highly toxic pollutant Cr(VI) and particularly has rapid adsorption kinetics; and the adsorption and removal rate of the amino-functionalization mesoporous gamma-Al2O3 absorbent for the Cr(VI) can be up to over 70% within 5min.

Description

technical field [0001] The present invention relates to the technical field of preparation and application of supported alumina composite materials, specifically an amine functionalized mesoporous γ-Al for the adsorption of highly toxic pollutants Cr(VI) 2 o 3 Preparation methods and applications of adsorbents. Background technique [0002] Chromium pollution in the environment mainly comes from the mining and smelting of chromium-containing ores, the manufacture of chromium salts, and the wastewater and smoke discharged from industrial sectors such as electroplating, metal processing, tanning, paint, pigments, and printing and dyeing. Drinking water contaminated with chromium can cause abdominal discomfort, diarrhea and other poisoning symptoms, and even death. The harm of chromium to the human body is manifested in the following aspects: (1) it can stimulate and sensitize the skin; (2) it can cause respiratory system damage such as nasal septum perforation, pharyngitis a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/32C02F1/28C02F1/62
Inventor 蔡卫权党成雄余家国谈立君
Owner WUHAN UNIV OF TECH
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