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Functional chitosan scaffold with surface charge tunability as filtering medium

A filter medium and surface charge technology, applied in the field of functional chitosan scaffolds with adjustable surface charge as filter medium, can solve the problem of lyophilized chitosan without public purification purpose, low mechanical strength, and unreported surface charge and density of chitosan scaffolds etc.

Active Publication Date: 2013-08-14
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, all these prior arts do not disclose freeze-dried chitosan for air or water purification purposes since the mechanical strength of the freeze-dried chitosan porous material is still too small for use as a filter medium.
Furthermore, chitosan scaffolds with tunable surface charges and densities have never been reported

Method used

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  • Functional chitosan scaffold with surface charge tunability as filtering medium
  • Functional chitosan scaffold with surface charge tunability as filtering medium
  • Functional chitosan scaffold with surface charge tunability as filtering medium

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Embodiment Construction

[0013] Hereinafter, presently preferred embodiments of the present invention will be described in detail, and these descriptions serve to explain the principles of the invention. While the embodiment or examples disclosed herein are sufficiently described to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be utilized and changes may be made without departing from the spirit of the invention.

[0014] The present invention relates to a functional chitosan scaffold for filter media and a preparation method thereof. The method involves lyophilizing a solution of chitosan. The lyophilization comprises freezing a chitosan solution at a first temperature and a first pressure, drying the solution at a second temperature and a second pressure to become a first lyophilized chitosan, and optionally thereafter The first freeze-dried chitosan is subjected to the second drying at three temperatures, and the third temperature is ...

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Abstract

The present invention discloses a method of preparing a functional chitosan scaffold and said functional chitosan scaffold for use as a filtering medium. Said method involves freeze-drying chitosan in the presence of appropriate cross-linkers and additives. The present chitosan scaffold is associated with an increased mechanical strength and elasticity and an adjustable surface polarity, porosity and morphology which enable its use in a wide range of devices, equipments and appliances in need of a filtering medium such as air or water purification system.

Description

[0001] Cross references to related applications [0002] This application claims priority to US Provisional Application No. 61 / 633,142, filed February 6, 2012, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a very versatile filter medium and a method for its production. In particular, the present invention relates to the use and preparation of functional chitosan scaffolds for such filter media. Background technique [0004] Chitosan, a (1-4)-linked 2-amino-2-deoxy-D-glucopyranose, is the second most abundant natural polysaccharide. Chitosan is known for its exceptional ability to absorb pollutants and heavy metals in water. Chitosan has been shown to absorb 1,000-1,100g / kg of reactive dyes in wastewater, several times higher than activated carbon typically used in the filtration industry. Chitosan is also far superior to metal-based filters in terms of bioavailability, biocompatibility, and cost. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/16
CPCB01D39/1676B01D39/16B01D2239/10
Inventor 黄家伟林菁怡陈梅
Owner NANO & ADVANCED MATERIALS INST
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