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Preparation method of amino silane modified gamma-Al2O3 thin film

A technology of aminosilane and film, which is applied in the preparation and application of aminosilane graft modified γ-Al2O3-based composite materials, can solve the problems of good adsorption performance, and achieve the effect of stable chemical properties and good cycle regeneration adsorption performance

Inactive Publication Date: 2016-04-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The key technical problem to be solved by the present invention is to prepare Cr (Ⅵ) Aminosilane graft-modified γ-Al with good pollutant adsorption performance, easy separation from water after adsorption, and renewable recycling 2 o 3 film

Method used

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  • Preparation method of amino silane modified gamma-Al2O3 thin film
  • Preparation method of amino silane modified gamma-Al2O3 thin film

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Disperse 3g of industrial pseudo-boehmite powder in 50ml of deionized water, add 0.86ml of glacial acetic acid with a mass fraction of 99.5% to dissolve the gel, stir for 2 hours and mix with 0.5g of The PVA solutions were mixed, and the stirring was continued for 6 h at room temperature to obtain a uniform mixed sol. The obtained sol was casted on a polytetrafluoroethylene sheet after being hydrothermally heated at 120°C for 12 hours, dried at room temperature for 48 hours and peeled off. γ-Al 2 o 3 film.

[0024]When adsorbing 100ml, 50mg / L Cr(Ⅵ) solution, adjust the pH to 3 with a hydrochloric acid solution with a concentration of 1mol / L, then add 0.2g of unmodified alumina film sample, and set the parameters of the constant temperature oscillation box to 25°C, 150r / min. The adsorption kinetic curve of Cr(Ⅵ) on unmodified alumina film is shown in figure 1 , the adsorption removal rate of Cr(Ⅵ) is 75.9%, and the adsorption capacity is 18.97mg / g.

Embodiment 2

[0026] Disperse 3g of industrial pseudo-boehmite powder in 50ml of deionized water, add 0.86ml of glacial acetic acid with a mass fraction of 99.5% to degelize, stir for 2 hours and mix with 0.5g of The PVA solutions were mixed, and the stirring was continued for 6 h at room temperature to obtain a uniform mixed sol. The obtained sol was casted on a polytetrafluoroethylene sheet after being hydrothermally heated at 120°C for 12 hours, dried at room temperature for 48 hours and peeled off. Unmodified alumina films were used for later use. 1 g of unmodified alumina film was dried at 110 °C for 2 h before use, and then placed in N 2 Reflux in a protected three-neck flask with 50ml of toluene solution at 85°C for 1 hour, then add 0.2ml of deionized water, then add 1ml of aminopropyltrimethoxysilane after 2 hours and continue to reflux for 18 hours. After washing once and twice with 20ml of absolute ethanol, vacuum-dry at 60°C for 6 hours. The sample is for use. The sample is ami...

Embodiment 3

[0030] Disperse 3g of industrial pseudo-boehmite powder in 50ml of deionized water, add 0.86ml of glacial acetic acid with a mass fraction of 99.5% to degelize, stir for 2 hours and mix with 0.5g of The PVA solutions were mixed, and the stirring was continued for 6 h at room temperature to obtain a uniform mixed sol. The obtained sol was casted on a polytetrafluoroethylene sheet after being hydrothermally heated at 120°C for 12 hours, dried at room temperature for 48 hours and peeled off. Unmodified alumina film. 1g of unmodified alumina film was dried at 110°C for 2h before use, and then placed in N 2 Reflux in a protected three-necked flask filled with 75°C and 50ml of absolute ethanol solution for 1 hour, then add 0.2ml of deionized water, add 2ml of aminopropyltrimethoxysilane after 2 hours, and continue to reflux for 12 hours. After washing with water and ethanol for 3 times, it was vacuum-dried at 60°C for 6 hours to prepare a modified film sample.

[0031] When adsor...

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Abstract

The invention relates to a preparation method of an amino silane modified gamma-Al2O3 thin film for toxic Cr (VI) adsorption. The preparation method comprises the following steps: firstly, under an acidic condition, peptizing industrial pseudo-boehmite powder, adding polyvinyl alcohol serving as a coalescing agent while peptizing, mixing for a period of time, performing hydrothermal treatment on sol, and performing tape casting, drying and baking on a sol product to prepare a gamma-Al2O3 thin film; and then, under the protection of N2, refluxing the gamma-Al2O3 thin film in a solvent with amino silane for a period of time, and washing and drying to obtain the amino silane modified gamma-Al2O3 thin film. Compared with the gamma-Al2O3 thin film before modification, the amino silane modified gamma-Al2O3 thin film prepared by the method is higher in removal rate and higher in adsorption performance for toxic Cr (VI) in water; meanwhile, the thin film adsorbing toxic Cr (VI) can be easily separated from water, so that the problem of a complicated process for separating and recycling a powdered adsorbent is solved, and the separation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation and application of aminosilane graft modified γ-Al2O3 based composite materials, specifically an aminosilane modified γ-Al used for the adsorption of highly toxic pollutant Cr(VI) 2 o 3 The method of film preparation. Background technique [0002] Wastewater containing Cr(Ⅵ) ions directly threatens human survival and living environment because of its wide source of pollutants and high toxicity to animals and plants. Therefore, it is necessary to study how to reduce the concentration of Cr(Ⅵ) in wastewater, reduce or Eliminating its damage to the environment has important practical significance. Among many Cr(Ⅵ) removal methods, the adsorption method has the advantages of simple operation, low cost and high removal rate, and has attracted widespread attention. The key to the adsorption method is the development of high removal rate, large adsorption capacity and excellent cycle regeneration a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01J20/28C02F1/28C02F1/62C02F101/22
CPCB01J20/08B01J20/22B01J20/28033B01J2220/46C02F1/28C02F1/62C02F2101/22
Inventor 蔡卫权罗磊
Owner WUHAN UNIV OF TECH
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