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Preparation method of amido functionalized gamma-aluminum oxide thin film

A technology of aluminum oxide and amine-based functions, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of good adsorption performance, achieve high removal rate, efficient method, Good water quality

Inactive Publication Date: 2017-08-22
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: through the synergistic control of process factors such as aluminum isopropoxide hydrolysis, degumming, adding suitable film-forming aids, selecting suitable roasting temperature and amine group functionalization conditions, to prepare Cr( VI) Amino-functionalized γ-Al with good pollutant adsorption performance, easy separation from water after adsorption, and recyclable recycling 2 o 3 film

Method used

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  • Preparation method of amido functionalized gamma-aluminum oxide thin film
  • Preparation method of amido functionalized gamma-aluminum oxide thin film
  • Preparation method of amido functionalized gamma-aluminum oxide thin film

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Take 5.67g of aluminum isopropoxide and add it to 50ml of deionized water at 70°C under strong stirring, add 0.2ml of glacial acetic acid dropwise, stir for 1 hour, add 0.3g of PVA solution that has been dissolved in 90°C and 10ml of deionized water, and mix. Then continue to stir at room temperature for a period of time to obtain a sol, transfer the sol to a hydrothermal kettle for 6 hours at 150°C, cool to room temperature, and tape-cast the obtained aluminum sol on a polytetrafluoroethylene sheet. After natural drying for 48 hours, it was peeled off, and the obtained sample was heated in a microwave muffle furnace at 1.5°C / min, and calcined at 600°C for 1 hour to obtain γ-Al 2 o 3 film.

[0033] When absorbing 100ml, 50mg / L Cr(VI) solution, adjust the pH=3 with a hydrochloric acid solution with a concentration of 1mol / L, then add 0.2g of unmodified aluminum oxide film sample, and set the parameters of the constant temperature oscillation box to 25°C, 150r / min. Unm...

Embodiment 2

[0035] Take 5.67g of aluminum isopropoxide and add it to 50ml of deionized water at 70°C under strong stirring, add 0.2ml of glacial acetic acid dropwise, stir for 1 hour, add 0.3g of PVA solution that has been dissolved in 90°C and 10ml of deionized water, and mix. Then continue to stir at room temperature for a period of time to obtain a sol, transfer the sol to a hydrothermal kettle for 6 hours at 150°C, cool to room temperature, and tape-cast the obtained aluminum sol on a polytetrafluoroethylene sheet. After natural drying for 48 hours, it was peeled off, and the obtained sample was heated in a microwave muffle furnace at 1.5°C / min, and calcined at 500°C for 3 hours to obtain γ-Al 2 o 3 film. Take 2g of the film and add it into 100ml of absolute ethanol dissolved in 3ml of 3-aminopropyl-triethoxysilane, shake and dip for 24 hours, wash with 20ml of absolute ethanol three times and dry to obtain the amino-functionalized γ-Al 2 o 3 Film samples.

[0036] When absorbing...

Embodiment 3

[0039] Take 5.67g of aluminum isopropoxide and add it to 50ml of deionized water at 70°C under strong stirring, add 0.2ml of glacial acetic acid dropwise, stir for 1 hour, add 0.3g of PVA solution that has been dissolved in 90°C and 10ml of deionized water, and mix. Then continue to stir at room temperature for a period of time to obtain a sol, transfer the sol to a hydrothermal kettle for 6 hours at 150°C, cool to room temperature, and tape-cast the obtained aluminum sol on a polytetrafluoroethylene sheet. After 48 hours of natural drying, the obtained sample was heated in a microwave muffle furnace at 1.5°C / min, and then calcined at 525°C for 2.5 hours to obtain γ-Al 2 o 3 film. Take 2g of the film and add it to 100ml of absolute ethanol dissolved in 0.5ml of PEI. After immersion for 24h, it is washed with 20ml of absolute ethanol for 3 times and dried to obtain amine-functionalized γ-Al 2 o 3 film.

[0040] When absorbing 100ml, 50mg / L Cr(VI) solution, adjust pH=3 with ...

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Abstract

The invention relates to a preparation method of an amido functionalized gamma-aluminum oxide thin film for toxicity Cr(VI) adsorption. The method comprises the following steps: firstly, hydrolyzing aluminum isopropoxide in an acidic condition to obtain a sol; then, adding a film forming agent, polyvinyl alcohol (PVA), into the sol while peptizing the sol, performing hydro-thermal treatment on the mixed and stirred sol, and then performing tape casting, drying and roasting to prepare a gamma-aluminum oxide thin film; and finally, immersing the gamma-aluminum oxide thin film with an organic amine solution in a vibrating condition and successively washing and drying the film to obtain the amido functionalized gamma-aluminum oxide thin film, wherein the thin film shows excellent selective adsorption ability on Cr(VI) in a mixed solution of Cr(VI), Cd(II), Cu(II), Zn(II) and Ni(II) and etc. The preparation method provided by the invention has the advantages of being efficient and simple to prepare and mild in condition and the prepared thin film is excellent in adsorption property and can be repeatedly regenerated and recycled; in addition, the thin film adsorbing Cr(VI) is easily separated from a water body, and can be continuously recycled for many times, so that the separating efficiency is greatly increased.

Description

technical field [0001] The present invention relates to organic amine impregnated modified γ-Al 2 o 3 The technical field of preparation and application of matrix composites, specifically, an amine-functionalized γ-Al for the adsorption of highly toxic pollutants Cr(VI) 2 o 3 The method of film preparation. Background technique [0002] In recent years, with the continuous acceleration of my country's industrialization, more and more industries are involved in heavy metal emissions, including mining, metal smelting, chemical industry, printing and dyeing, leather, pesticides and feed, etc. Problems such as sewage discharge are prominent, especially industrial wastewater and groundwater containing highly toxic heavy metal ions such as Cr(VI), Cd(II), Pb(II) and As(V), which have caused more and more serious problems to human health and living environment. hazards. my country is the main country for the production of chromium salts. In the process of producing chromium salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F1/62C02F101/22
CPCB01J20/08B01J20/22B01J20/28033B01J2220/4806B01J2220/4812C02F1/281C02F1/285C02F2101/22
Inventor 蔡卫权普春徐江钟家和
Owner WUHAN UNIV OF TECH
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