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Quaternized chitosan HTCC/CA/TiO2 hybrid membrane, and preparation method thereof

A technology of quaternized chitosan and hybrid membrane, applied in the field of membrane separation, can solve the problems of unsatisfactory mechanical properties, poor mechanical strength, high swelling degree, and achieve good antibacterial ability, improved antibacterial performance, and good mechanical properties. Effect

Inactive Publication Date: 2015-04-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hoven et al. immersed the chitosan membrane in 10.0mL of anhydrous methanol solution containing 0.16gNaOH and 0.30gNaI, added 0.6g methyl iodide in portions and reacted at 40°C to obtain a positively charged chitosan membrane, and the original chitosan Compared with the membrane, the membrane has better selective adsorption to protein and is less dependent on the pH value, but the membrane has a higher degree of swelling in water and poor mechanical strength (Hoven V P, Tangpasuthadol V, Angkitpaiboon Y, Vallapa N and Kiatkamjornwong S. Surface-charged chitosan: Preparation and protein adsorption. Carbohydrate Polymers, 2007, 68(1): 44-53)
Tao et al prepared CTS / TiO by sol-gel method 2 hybrid film, and optimized its tensile strength by response surface method, and determined the best film-making conditions, but the mechanical properties of the film were not ideal (Tao Y G, Pan J, Yan S L, Tang B and Zhu L B.Tensile strength optimization and characterization of chitosan / TiO 2 hybrid film.Materials science and Engineering B,2007,138:84-89)

Method used

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  • Quaternized chitosan HTCC/CA/TiO2 hybrid membrane, and preparation method thereof
  • Quaternized chitosan HTCC/CA/TiO2 hybrid membrane, and preparation method thereof
  • Quaternized chitosan HTCC/CA/TiO2 hybrid membrane, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Weigh quantitative HTCC and CA respectively according to a blending ratio of 1:1 and place them in a 150mL beaker, add a 70% aqueous solution of acetic acid, and keep stirring until HTCC and CA are completely dissolved, and the mass concentration is 2% mixture. Then add nano-TiO with a mass fraction of 0.5% to the mixture 2 , through ultrasonic dispersion (KQ-100PE ultrasonic dispersion machine), the TiO in the casting solution 2 The particles are evenly dispersed, and after standing for defoaming under vacuum conditions, pour the casting solution into a watch glass and dry at 50°C to form a film. Finally, the prepared membrane was soaked in 0.1mol / L NaOH solution for 1 hour, then washed with deionized water until the water became neutral, and then dried naturally at room temperature for determination.

[0028] Prepared HTCC / CA / TiO 2 The mechanical strength of the hybrid membrane is 59.69MPa, the elongation at break is 41.43%, the swelling degree is 109.05...

Embodiment 2

[0029] Embodiment 2: Weigh quantitative HTCC and CA respectively according to the blending ratio of 1:1 and place it in a 150mL beaker, add a 70% aqueous solution of acetic acid, and keep stirring until HTCC and CA are completely dissolved, and the mass concentration is 2% mixture. Then add nano-TiO with a mass fraction of 1.0% to the mixture 2 , through ultrasonic dispersion (KQ-100PE ultrasonic dispersion machine), the TiO in the casting solution 2 The particles are evenly dispersed, and after standing for defoaming under vacuum conditions, pour the casting solution into a watch glass and dry at 60°C to form a film. Finally, the prepared membrane was soaked in 0.1mol / L NaOH solution for 1 hour, then washed with deionized water until the water became neutral, and then dried naturally at room temperature for determination.

[0030] Prepared HTCC / CA / TiO 2 The mechanical strength of the hybrid membrane is 84.29MPa, the elongation at break is 55.12%, the swelling degree is 101...

Embodiment 3

[0031] Example 3: Take quantitative HTCC and CA according to the blending ratio of 1:1 and place them in a 150mL beaker, add a 70% aqueous solution of acetic acid, and keep stirring until HTCC and CA are completely dissolved, and the mass concentration is 2% mixture. Then add nano-TiO with a mass fraction of 1.5% to the mixture 2 , through ultrasonic dispersion (KQ-100PE ultrasonic dispersion machine), the TiO in the casting solution 2The particles are evenly dispersed, and after standing for defoaming under vacuum conditions, pour the casting solution into a watch glass and dry at 60°C to form a film. Finally, the prepared membrane was soaked in 0.1mol / L NaOH solution for 1 hour, then washed with deionized water until the water became neutral, and then dried naturally at room temperature for determination.

[0032] Prepared HTCC / CA / TiO 2 The mechanical strength of the hybrid membrane is 63.86MPa, the elongation at break is 49.11%, the swelling degree is 122.83%, and the io...

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Abstract

The invention provides a preparation method of quaternized chitosan HTCC / CA / TiO2 hybrid membrane. The preparation method comprises following steps: positively charged 2-hydroxypropyltrimethyl ammonium chloride chitosan (HTCC) and cellulose acetate (CA) are blended so as to obtain an organic substrate; nano TiO2 is introduced; ultrasonic dispersing and standing defoaming under vacuum conditions are performed; and the organic-inorganic HTCC / CA / TiO2 hybrid membrane is obtained via solution blending. The preparation method is simple; cost is relatively low; and the quaternized chitosan HTCC / CA / TiO2 hybrid membrane is natural and is friendly to the environment. The quaternized chitosan HTCC / CA / TiO2 hybrid membrane possesses excellent mechanical properties, swelling performance, and ion exchange capacity; possesses excellent antibacterial performance on gram-negative bacteria E.coliRosetta and E.coliDH5alpha, and gram-positive bacterium Bacillussubtilis; and can be used for separation purification of some sewage containing trace pollutants in the field of biochemistry and environmental engineering.

Description

technical field [0001] The invention relates to a quaternized chitosan HTCC / CA / TiO 2 A hybrid membrane and a preparation method thereof, especially a hybrid membrane with good mechanical properties and swelling properties and antibacterial ability and a preparation method thereof, belong to the field of membrane separation. Background technique [0002] Chitosan is the product of deacetylation of chitin, which is abundant in nature and has unique biocompatibility, biodegradability, antibacterial properties and film-forming properties. There are a large number of hydroxyl groups (-OH) and amino groups (-NH) distributed on the molecular chain of chitosan 2 ), the existence of these active groups makes it easy to undergo derivatization modification, so functionalized membrane materials based on chitosan and its derivatives have attracted more and more attention. Hoven et al. immersed the chitosan membrane in 10.0mL of anhydrous methanol solution containing 0.16gNaOH and 0.30g...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D69/02B01D67/00
Inventor 黄中华李伟静古丽米拉·艾克拜尔刘郑丽朱立君
Owner NANJING UNIV OF SCI & TECH
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