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Chitosan/gamma-AlOOH composite thin film for absorbing Pb(II) in water and preparation method and application thereof

A composite film, chitosan technology, applied in the direction of adsorption water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution, difficult product separation, residue, etc. The effect of simple and easy operation in separation and preparation process

Inactive Publication Date: 2019-09-10
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned composite materials are powders, and the products after adsorbing pollutants are not only difficult to separate from the water body, but also easily remain in the water body to cause secondary pollution.

Method used

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  • Chitosan/gamma-AlOOH composite thin film for absorbing Pb(II) in water and preparation method and application thereof
  • Chitosan/gamma-AlOOH composite thin film for absorbing Pb(II) in water and preparation method and application thereof
  • Chitosan/gamma-AlOOH composite thin film for absorbing Pb(II) in water and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Dissolve 6.3g aluminum nitrate nonahydrate in 15mL deionized water at room temperature, then slowly add 20mL, 5wt% ammonia water dropwise; the obtained precipitate is centrifugally washed with deionized water until the pH of the filtrate is ≈7, Then the precipitate is dispersed in 30mL of deionized water (the amount of the precipitate is calculated according to the reaction of aluminum nitrate nonahydrate and ammonia water), magnetically stirred at a speed of 500r / min, and 0.305mL of acetic acid and 10g of 5wt% polyvinyl alcohol solution are added successively. After stirring for 1 h at room temperature, it was aged in an oil bath at 90°C for 24 h.

[0039] (2) the γ-AlOOH sol obtained in step (1) is cooled to normal temperature, and then mixed with chitosan sol (2wt%, dissolved in 2v / v% acetic acid aqueous solution) by volume ratio γ-AlOOH sol: chitosan sol = 1 mixed.

[0040] (3) Take 20mL of the mixed sol in step (2), add 1mL of 5wt% glutaraldehyde, stir for 10h...

Embodiment 2

[0044] (1) Dissolve 6.3g aluminum nitrate nonahydrate in 15mL deionized water at room temperature, then slowly add 20mL, 5wt% ammonia water dropwise; the obtained precipitate is centrifugally washed with deionized water until the pH of the filtrate is ≈7, Then disperse the precipitate in 30mL of deionized water, stir it magnetically at a rate of 500r / min, add 0.305mL of acetic acid and 10g of 5wt% polyvinyl alcohol solution in turn, stir at room temperature for 1h, and then age in an oil bath at 90°C for 24h .

[0045] (2) the γ-AlOOH sol obtained in step (1) is cooled to normal temperature, and then mixed with chitosan sol (2wt%, dissolved in 2v / v% acetic acid aqueous solution) by volume ratio γ-AlOOH sol: chitosan sol = 1 mixed.

[0046] (3) Take 20mL of the mixed sol in step (2), add 0.5mL of 5w% glutaraldehyde, stir for 10h, and finally apply the chitosan / γ-AlOOH composite sol on a 2cm×6cm ceramic plate to make it flow After stretching and drying at room temperature for ...

Embodiment 3

[0049] (1) Dissolve 6.3g aluminum nitrate nonahydrate in 15mL deionized water at room temperature, then slowly add 20mL, 5wt% ammonia water dropwise; the obtained precipitate is centrifugally washed with deionized water until the pH of the filtrate is ≈7, Then disperse the precipitate in 30mL of deionized water, stir it magnetically at a rate of 500r / min, add 0.305mL of acetic acid and 10g of 5wt% polyvinyl alcohol solution in turn, stir at room temperature for 1h, and then age in an oil bath at 90°C for 24h .

[0050] (2) the γ-AlOOH sol obtained in step (1) is cooled to normal temperature, and then mixed with chitosan sol (2wt%, dissolved in 2v / v% acetic acid aqueous solution) by volume ratio γ-AlOOH sol: chitosan sol = 1 mixed.

[0051] (3) Get the mixed sol 20mL in the step (2), smear it on the 2cm * 6cm ceramic plate, make it tape casting, and take off the film after drying at room temperature for 48h, obtain the described chitosan / γ-AlOOH composite film.

[0052] (4)...

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Abstract

The invention discloses a chitosan / gamma-AlOOH composite thin film for absorbing Pb(II) in water and a preparation method and an application thereof. The method comprises the following steps: firstly,preparing gamma-AlOOH sol, mixing with chitosan sol and then adding glutaraldehyde to cross-link it; finally, casting and forming the composite sol and drying to obtain the chitosan / gamma-AlOOH composite thin film. Compared with single gamma-AlOOH thin film and chitosan film, the chitosan / gamma-AlOOH composite thin film has higher adsorption capacity, higher adsorption rate and stronger acid resistance to Pb (II) in water, the adsorption capacity on 10 mg / L Pb (II) is 9.67 mg / g, and the removal rate was 96.75%. The residual concentration of Pb (II) in water could be reduced to 0.33 mg / L, which met the national discharge standard of Pb (II) in industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of a chitosan / γ-AlOOH composite film, and in particular relates to a chitosan / γ-AlOOH composite film used for adsorption of Pb(II) in water and a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of industrial production, heavy metal pollutants such as Pb(II), Cd(II), Cu(II), Zn(II), Hg (I) and so on are discharged into water bodies in large quantities, which poses a serious threat to agricultural, industrial and domestic water use. Because heavy metal ions cannot be biodegraded and have high toxicity, they will cause serious harm to the human body through the transmission and enrichment of the food chain. Among them, Pb(II) will affect human intelligence and bone development, and cause indigestion and endocrine Imbalance, leading to anemia, high blood pressure, also destroys kidney function and immune functio...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/08B01J20/28033C02F1/288C02F2101/20
Inventor 蔡卫权陈依婷党成雄
Owner GUANGZHOU UNIVERSITY
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