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SiO2/gamma-AlOOH compound thin film for toxic Cr(VI) adsorption and preparing method and application thereof

A composite film, toxic technology, applied in the fields of adsorption water/sewage treatment, water/sludge/sewage treatment, silicon compounds, etc., can solve the problems of harsh conditions, high equipment requirements, low adsorption capacity, etc., and achieve good toughness and strength. , The effect of low equipment requirements and simple preparation process

Active Publication Date: 2019-07-30
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two nanofiber membranes have good adsorption properties, but they have high requirements for equipment, and the preparation process needs to be carried out under high pressure, which has certain risks.
Chinese patent application CN108031432A discloses a magnesium modified SiO 2 The preparation method of the film, the preparation process of this method is simple, the reaction conditions are mild, but the adsorption kinetics of the film is slow, and the adsorption equilibrium can only be reached after 4 hours of adsorption
Chinese patent application CN105107486A discloses a method for preparing a pseudo-boehmite composite film for the adsorption of toxic Cr(Ⅵ), which has a high removal rate for low-concentration Cr(Ⅵ) solutions, but its adsorption capacity is low
Chinese patent application CN107081132A discloses a preparation method of amine-functionalized γ-alumina film, but the preparation process consumes a lot of energy and takes a long time
Chinese patent application CN105498699A discloses an aminosilane modified γ-Al 2 o 3 The preparation method of the film, but vacuum drying is required during the preparation process, the conditions are harsh and time-consuming

Method used

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  • SiO2/gamma-AlOOH compound thin film for toxic Cr(VI) adsorption and preparing method and application thereof
  • SiO2/gamma-AlOOH compound thin film for toxic Cr(VI) adsorption and preparing method and application thereof
  • SiO2/gamma-AlOOH compound thin film for toxic Cr(VI) adsorption and preparing method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Dissolve 2.2g CTAB in a mixed solution of 21.6g deionized water and 13.8g absolute ethanol at room temperature at a stirring rate of 500r / min; Add 5 g of tetraethyl orthosilicate dropwise, react at room temperature for 1 h at a stirring rate of 500 r / min, add 50 μL, 12 mol / L concentrated hydrochloric acid for further hydrolysis polymerization for 2 h, and obtain clear, transparent and stable SiO 2 Sol.

[0049] (2) Add 25mL of 5wt% ammonia water dropwise to 25mL, 0.96mol / L aluminum nitrate nonahydrate solution to obtain aluminum hydroxide precipitate, wash with deionized water several times to neutrality, and filter under reduced pressure to obtain aluminum hydroxide filter cake; ultrasonically disperse it in 50mL deionized water in an ultrasonic cleaning machine for 15-20min; press n(H + ) / n(Al 3+ )=0.3mol / mol adding HNO 3 , heated to 90 ° C for 2 h to obtain a stable γ-AlOOH sol.

[0050] (3) Take 5mL of SiO 2 The sol, 5mL of γ-AlOOH sol and 5mL of PVA aqueou...

Embodiment 2

[0053] (1) Dissolve 2.2g CTAB in a mixed solution of 21.6g deionized water and 13.8g absolute ethanol at room temperature at a stirring rate of 500r / min; Add 5 g of tetraethyl orthosilicate, react at room temperature for 1 h at a stirring rate of 500 r / min, add dropwise 50 μL, 12 mol / L concentrated hydrochloric acid for further hydrolysis and polymerization for 2 h, and obtain clear, transparent and stable SiO 2 Sol.

[0054] (2) Add 25mL, 5wt% ammonia water dropwise to 25mL, 0.96mol / L aluminum nitrate nonahydrate solution, obtain aluminum hydroxide precipitate, centrifuge and wash with deionized water several times until neutral, filter under reduced pressure to obtain aluminum hydroxide filter cake ; Ultrasonic in an ultrasonic cleaning machine for 15-20min to make it evenly dispersed in 50mL deionized water; press n(H + ) / n(Al 3+ )=0.3mol / mol adding HNO 3 , the temperature was raised to 90° C. for 2 h, and a stable γ-AlOOH sol was obtained.

[0055] (3) Take 5mL SiO 2 ...

Embodiment 3

[0060] (1) Dissolve 2.2g of CTAB in a mixed solution of 21.6g of deionized water and 13.8g of absolute ethanol at room temperature at a stirring rate of 500r / min; Add 5 g of tetraethyl orthosilicate dropwise, react at room temperature for 1 h at a stirring rate of 500 r / min, add 50 μL of 12 mol / L concentrated hydrochloric acid for further hydrolysis and polymerization for 2 h, and obtain clear, transparent and stable SiO 2 Sol.

[0061] (2) Add 25mL, 5wt% ammonia water dropwise to 25mL, 0.96mol / L aluminum nitrate nonahydrate solution to obtain aluminum hydroxide precipitate, wash with deionized water several times to neutrality, and filter under reduced pressure to obtain aluminum hydroxide filter cake; ultrasonically disperse it in 50mL deionized water in an ultrasonic cleaning machine for 15-20min; press n(H + ) / n(Al 3+ )=0.3mol / mol adding HNO 3 , the temperature was raised to 90° C. for 2 h, and a stable γ-AlOOH sol was obtained.

[0062] (3) Take 5mL of SiO 2 The sol,...

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Abstract

The invention discloses a SiO2 / gamma-AlOOH compound thin film for toxic Cr(VI) adsorption and a preparing method and application thereof. The method includes the steps of preparing stable SiO2 sol andgamma-AlOOH sol, mixing the SiO2 sol and gamma-AlOOH sol according to a certain ratio, adding an acidified PVA water solution to be evenly stirred, conducting tape casting and drying on a base material, and conducting tearing off to obtain the SiO2 / gamma-AlOOH compound thin film with excellent adsorption performance on toxic Cr(VI). The method has the advantages that the aluminum source is convenient to obtain and free of toxin and harm, and the method is mild in reaction condition, simple in preparing process and the like; the prepared SiO2 / gamma-AlOOH compound thin film has excellent adsorption performance on toxic Cr(VI) and has the maximum adsorption amount of 33.67 mg / g, the SiO2 / gamma-AlOOH compound thin film which has been used for adsorbing toxic Cr(VI) can be easily separated from a water body directly without causing secondary contamination to the water body.

Description

technical field [0001] The invention belongs to the technical field of the development of high-performance composite adsorbents for the adsorption and separation of heavy metal ions, and in particular relates to a SiO used for the adsorption of toxic Cr(VI) 2 Preparation method and application of γ-AlOOH composite film. Background technique [0002] Water is one of the most important natural resources. With the development of metal smelting, mining, battery, electroplating, leather and pesticide industries, water pollution caused by toxic and harmful heavy metal ions (such as chromium, arsenic, cadmium, lead, etc.) has seriously endangered human health and people's survival natural environment. Chromium is listed as one of the most toxic pollutants by the U.S. Environmental Protection Agency. It is easily soluble in water and difficult to separate from water. It can also enter the human body through the skin surface, digestive tract and respiratory tract at low concentrati...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/103B01J20/08B01J20/28033C02F1/281C02F2101/22
Inventor 蔡卫权丘文娟陈依婷
Owner GUANGZHOU UNIVERSITY
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