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Preparation method of calcined magnesium-aluminum hydrotalcite film

A magnesium-aluminum hydrotalcite and film technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low adsorption capacity, harsh conditions, difficult control, etc., and achieve easy preparation process and acid resistance Good performance and high removal rate

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Problems solved by technology

For example, Gu Yunan et al [Gu Yunan, Wang Lu, Feng Ruijiang, Wang Jilin. Study on the adsorption performance of QCS-TBT organic-inorganic hybrid membrane on heavy metal Cr(VI)[J]. Chemistry and Adhesion, 2013, 35(6). ] Using the sol-gel method, a series of quaternized chitosan-n-butyl titanate organic-inorganic hybrid membranes that can be used for Cr(VI) adsorption were prepared, but the preparation process was complicated and the adsorption capacity was low. high
Chinese patent CN105107486A discloses a preparation method of pseudo-boehmite composite film for the adsorption of toxic Cr(VI), which has a high removal rate for low-concentration Cr(VI), but its adsorption capacity is low
Chinese patent CN105498699A discloses an aminosilane modified γ-Al 2 o 3 The preparation method of thin film, but the preparation process is more complicated, the conditions are harsh and difficult to control
Chinese patent CN108031432A discloses a magnesium-modified SiO for toxic Cr(VI) adsorption 2 The preparation method of the film, the preparation process of this method is simple, the conditions are mild, and the film after adsorption is very easy to be directly separated from the water body, but the adsorption capacity is not high
Chinese patent CN107081132A discloses an amino-functionalized γ-Al for the adsorption of toxic Cr(VI) 2 o 3 A thin film preparation method, which has the advantages of high efficiency, simplicity, mild conditions, excellent adsorption performance of the prepared thin film and repeated regeneration cycles, etc., but its adsorption capacity still needs to be further improved

Method used

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  • Preparation method of calcined magnesium-aluminum hydrotalcite film
  • Preparation method of calcined magnesium-aluminum hydrotalcite film
  • Preparation method of calcined magnesium-aluminum hydrotalcite film

Examples

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Embodiment 1

[0031] Disperse 6.00 g of aluminum nitrate nonahydrate and 12.31 g of magnesium nitrate hexahydrate in 50 mL of deionized water at room temperature to form a mixed solution; then slowly add 20 mL of concentrated ammonia water with a volume fraction of 20%, centrifuge the obtained precipitate and use Wash with deionized water to pH ≈ 7.5; disperse the washed precipitate in 50 mL of deionized water, stir at a rate of 400 r / min at room temperature, then add 5 g of citric acid monohydrate and 5 g of 10% PVA solution at room temperature Stirring was continued for 12 hours to obtain magnesium aluminum hydrotalcite sol; the product was tape-cast on a polytetrafluoroethylene sheet (6cm×8cm), and the film was peeled off after natural drying at room temperature for 48 hours; then, it was placed in a muffle furnace at 3°C The temperature was raised to 500°C at a heating rate of / min, and after 4 hours of calcination, the calcined magnesium aluminum hydrotalcite film was obtained. The XRD...

Embodiment 2

[0034] Disperse 6.00g of aluminum nitrate nonahydrate and 8.21g of magnesium nitrate hexahydrate in 50mL of deionized water at room temperature to form a mixed solution; then, slowly add 20mL of concentrated ammonia water with a volume fraction of 20%, and centrifuge the obtained precipitate And wash with deionized water to pH ≈ 7.5; disperse the washed precipitate in 50mL of deionized water, stir at a rate of 400r / min at room temperature, then add 4g of citric acid monohydrate and 5g of PVA with a mass fraction of 10% in sequence Solution, continue to stir at room temperature for 12 hours to obtain magnesium aluminum hydrotalcite sol; cast the product on a polytetrafluoroethylene sheet (6cm×8cm), and peel off the film after natural drying at room temperature for 48 hours; then, put it in a muffle furnace The temperature was raised to 400° C. at a heating rate of 3° C. / min, and calcined for 4 hours to obtain a calcined magnesium aluminum hydrotalcite film. The XRD detection of...

Embodiment 3

[0037] Disperse 6.00g of aluminum nitrate nonahydrate and 24.01g of magnesium nitrate hexahydrate in 50mL of deionized water at room temperature to form a mixed solution; then slowly add 20mL of concentrated ammonia water with a volume fraction of 20%, centrifuge the obtained precipitate and use Wash with deionized water to pH ≈ 7.5; disperse the washed precipitate in 50mL of deionized water, stir at a rate of 400r / min at room temperature, then add 6g of citric acid monohydrate and 5g of 10% PVA solution in sequence , continue stirring at room temperature for 12 hours to obtain magnesium aluminum hydrotalcite sol; cast the product on a polytetrafluoroethylene sheet (6cm×8cm), and peel off the film after natural drying at room temperature for 48 hours; then put the film in a muffle furnace The temperature was raised to 500° C. at a heating rate of 3° C. / min, and calcined for 4 hours to obtain a calcined magnesium aluminum hydrotalcite film. The XRD detection of the unbaked samp...

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Abstract

The invention relates to a preparation method of a calcined magnesium-aluminum hydrotalcite film. The method concretely comprises the following steps: sequentially dissolving aluminum nitrate nonahydrate and magnesium nitrate hexahydrate in a certain amount of deionized water at room temperature; adding a certain amount of ammonia water after above two substances are completely dissolved in orderto obtain a precipitate, and carrying out centrifugal washing on the obtained precipitate with deionized water until the pH value is about 7.5; uniformly dispersing the precipitate in deionized waterunder a magnetic stirring condition; sequentially adding citric acid and a film-forming aid PVA solution, continuously performing stirring at room temperature to obtain a magnesium-aluminum mixed sol,uniformly applying the sol to a polytetrafluoroethylene sheet, carrying out tape casting, and drying the sheet coated with the sol to form a film in order to obtain a magnesium-aluminum hydrotalcitefilm; and calcining the film in a muffle furnace for 4 h to obtain the calcined magnesium-aluminum hydrotalcite film for adsorbing a Cr (VI) solution having a pH value of 3-5 and a concentration of 50mg / L. The method has the advantages of simple preparation process, mild conditions and good adsorption performance on heavy metal ions Cr (VI).

Description

technical field [0001] The present invention relates to the technical field of preparation method and application of roasted magnesium aluminum hydrotalcite film, to be precise, it is a kind of preparation method of roasted hydrotalcite film used for the adsorption of highly toxic pollutants containing Cr(VI) electroplating wastewater, and also Extended to calcined copper-aluminum hydrotalcite film, nickel-aluminum hydrotalcite film, etc. Background technique [0002] Chromium, a common heavy metal element in chromium-containing electroplating wastewater, is a serious hazard to the ecological environment and human health. Chromium ions mainly exist in the form of trivalent chromium and hexavalent chromium in water, among which hexavalent chromium Cr(VI) is the most toxic and has high carcinogenicity after entering the human body through the food chain, and is one of the main environmental pollutants. The prevention and treatment of Cr(VI) wastewater has received extensive a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F101/22C02F103/16
CPCB01J20/12B01J20/28033C02F1/281C02F2101/22C02F2103/16
Inventor 蔡卫权段娜
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