Preparation method and application of chitosan and polyvinyl alcohol mixed film

A technology of polyvinyl alcohol and mixed membrane, applied in the separation and removal of heavy metal ions in water, preparation of chitosan membrane, preparation of chitosan/polyvinyl alcohol mixed membrane, to achieve efficient removal of heavy metal ions and easy operation , the effect of low energy consumption

Active Publication Date: 2012-09-19
无锡市方成彩印包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to solve the limitations and defects of the existing method for removing heavy metal ions in wastewater, the present invention provides a preparation method and application of chitosan / polyvinyl alcohol mixed membrane to make up for the existing Inadequacies and defects of technology to meet the needs of production and life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of chitosan / polyvinyl alcohol mixed film: chitosan with a degree of deacetylation of 90% was dissolved with 1% (v / v) acetic acid aqueous solution to form a chitosan acetic acid solution with a mass fraction of 2 wt%. A certain amount of polyvinyl alcohol powder with a degree of polymerization of 2000 and a degree of hydrolysis of 98% was weighed to prepare a 3 wt% aqueous solution. Chitosan acetic acid solution and polyvinyl alcohol solution were mixed at a ratio of 50 g: 50 g, and stirred at 30° C. for 5 h. The mixed solution was added to a petri dish, evaporated to remove water at room temperature, and cast into a film. The obtained mixed film was immersed in 4% sodium hydroxide solution for 2 hours to remove excess acid on the surface of the cast film, then rinsed with deionized water several times, and vacuum-dried in a vacuum oven to constant weight. The obtained cast film was cut into 60mm long and 10mm wide, and then the film was preheated in an oven...

Embodiment 2

[0017] Preparation of chitosan / polyvinyl alcohol mixed film: Chitosan with a deacetylation degree of 92% was dissolved with 3% (v / v) acetic acid aqueous solution to form a chitosan acetic acid solution with a mass fraction of 5 wt%. A certain amount of polyvinyl alcohol powder with a degree of polymerization of 2000 and a degree of hydrolysis of 98% was weighed to prepare a 2.5 wt% aqueous solution. Chitosan acetic acid solution and polyvinyl alcohol solution were mixed at a ratio of 40 g: 60 g, and stirred at 50° C. for 4 h. The mixed solution was added to a petri dish, evaporated to remove water at room temperature, and cast into a film. The obtained mixed film was immersed in 4% sodium hydroxide solution for 2 hours to remove excess acid on the surface of the cast film, then rinsed with deionized water several times, and vacuum-dried in a vacuum oven to constant weight. The obtained cast film was cut into 60mm long and 10mm wide, and then the film was preheated in an oven ...

Embodiment 3

[0020] Preparation of chitosan / polyvinyl alcohol mixed film: chitosan with a deacetylation degree of 95% was dissolved with 2% (v / v) acetic acid aqueous solution to form a chitosan acetic acid solution with a mass fraction of 3 wt%. A certain amount of polyvinyl alcohol powder with a degree of polymerization of 2000 and a degree of hydrolysis of 98% was weighed to prepare a 2wt% aqueous solution. Chitosan acetic acid solution and polyvinyl alcohol solution were mixed at a ratio of 30 g: 70 g, and stirred at 40° C. for 5 h. The mixed solution was added to a petri dish, evaporated to remove water at room temperature, and cast into a film. The obtained mixed film was immersed in 4% sodium hydroxide solution for 2 hours to remove excess acid on the surface of the cast film, then rinsed with deionized water several times, and vacuum-dried in a vacuum oven to constant weight. The obtained cast film was cut into 60mm long and 10mm wide, and then the film was preheated in an oven at ...

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Abstract

The invention provides a preparation method of a chitosan and polyvinyl alcohol mixed film and the application of the chitosan and polyvinyl alcohol mixed film to the aspect of heavy metal ion separation and removal in water. The chitosan and polyvinyl alcohol mixed film is formed by blending the chitosan and the polyvinyl alcohol, so the chitosan and polyvinyl alcohol mixed film is enabled to have excellent adsorption and chelation abilities of a chitosan film, and meanwhile, the mechanical strength of the chitosan film is greatly enhanced and the service life of the chitosan film is greatly prolonged; and the adsorption and chelation abilities synergistically act with an interception effect of the chitosan and polyvinyl alcohol mixed film, so heavy metal ions can be effectively removed from the water. Compared with a method for removing the heavy metal ions from a solution in the prior art, a method for removing the heavy metal ions from the water by using the chitosan and polyvinyl alcohol mixed film prepared by adopting the preparation method can overcome the disadvantages that the heavy metal ions cannot be completely removed and poisonous sludge or waste is produced by using ordinary inorganic or organic adsorbent, electrocoagulation, and the like, and has the advantages of efficient removal of the heavy metal ions, low energy consumption, low cost, no secondary pollution, convenience in operation and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a chitosan film, in particular to a preparation method of a chitosan / polyvinyl alcohol mixed film and its application in separating and removing heavy metal ions in water. The invention relates to the preparation of a polymer mixed membrane, the technical field of environmental protection, and the application field of the membrane, and particularly belongs to the field of water treatment containing heavy metal ions. Background technique [0002] Because chitosan has a large number of amino and hydroxyl active groups, it is often prepared as a spherical adsorbent for the treatment of heavy metal wastewater and dye wastewater. However, due to the limited adsorption capacity of chitosan, when used as an adsorbent, the effect of treating wastewater is not ideal. O.P.Dancette et al. (Purification of immunoglobulins G by protein A / G affinity membrane chromatography[J].Journalof Chromatography ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D71/08B01D69/00C02F1/44C02F1/62
Inventor 顾文秀吴婷婷李磊邹路易李佩倩张文艳
Owner 无锡市方成彩印包装有限公司
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