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Chitosan based high performance filter with self-regenerating ability

A technology of regeneration ability and chitosan, applied in membrane filter, biocide, filtration and separation, etc., can solve the problems of filter failure and difficult adjustment.

Active Publication Date: 2015-04-29
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most conventional filters are not self-regenerating and need to be replaced periodically after the filter becomes full of contaminants
The pore size of conventional filter media is not easily adjusted to suit various particles

Method used

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  • Chitosan based high performance filter with self-regenerating ability
  • Chitosan based high performance filter with self-regenerating ability
  • Chitosan based high performance filter with self-regenerating ability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1-controlling the pore size by adjusting the degree of cross-linking

[0021] Sodium tripolyphosphate (TPP) is a non-toxic cross-linking agent, which is used in the present invention to cross-link chitosan polymer by ion cross-linking. The amount of TPP added to the chitosan-based filter media directly affects the pore size of the filter media. As the amount of TPP decreased, the pore size of chitosan-based filter media increased ( figure 1 ). The pore size varies from a few microns to over 100 microns, preferably 5 microns. In this example, 1.8% w / w chitosan was used.

Embodiment 2

[0022] Example 2 - Controlling Pore Size by Adjusting the Amount of Copolymer

[0023] In this example, the pore size of the chitosan skeleton can be fine-tuned by adjusting the amount of copolymer added. For example, polyvinyl alcohol (PVA) was added to chitosan backbone to modify its morphology. As the amount of PVA decreased, the pore size of chitosan-based filter media increased. PVA was able to fill the voids between cross-linked chitosan to minimize the pore size. The pore size can range from a few microns to hundreds of microns, preferably 5 microns.

[0024] The PVA consumption in the chitosan film of table 1:

[0025] Sample No.

Embodiment 3

[0026] Example 3 - Controlling Pore Size Using Different Freezing Methods

[0027] Chitosan solutions need to be frozen prior to lyophilization. The freezing method is one of the decisive factors in controlling the pore size. Taking the PVA / chitosan copolymer solution (Table 2) as an example, the chitosan film ( image 3 A) Chitosan film frozen in liquid nitrogen (approximately -210°C to -196°C) ( image 3 B) Produces larger pores.

[0028] The formula of table 2.PVA / chitosan copolymer solution:

[0029] PVA(wt%)

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Abstract

A self-regenerating chitosan based filter medium for disinfecting and purifying organic pollutants and other pollutants in a gas or liquid is disclosed herein. Porosity and surface charge of said filter medium is manipulative / tunable by varying one or more of the following parameter(s): concentration of chitosan, crosslinking density, amount of copolymers and additives, freezing temperature, freezing profile, and / or types of crosslinker used. The present filter medium is capable of self-regenerating under exposure to ultra-violet light for sufficient time and removing over 90% of the pollutants from each influent flowing through the filter medium.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 61 / 961,443, filed October 15, 2013, the entire disclosure of which priority is incorporated herein by reference. technical field [0003] The presently claimed invention relates to a high-performance filter with self-regenerating capability, in particular, to a chitosan-based high-performance filter with self-regenerating capability, controllable porosity, and adjustable surface charge Electricity, so that it can effectively remove specific size particles, heavy metals, bacteria and organic pollutants in the gas and liquid flowing through it. Background technique [0004] Chitosan is a (1-4) bond-linked polycationic biopolymer of 2-amino-2-deoxy-D-glucopyranose, which is a ubiquitous natural polysaccharide, due to the absorption of gases and It is well known for its excellent sterilizing ability for pollutants and heavy metals in water bodies. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/14C02F1/62C02F1/00B01J31/26B01J31/38B01J35/10
CPCB01D39/1676B01D2239/10B01J20/3085B01J20/28083B01J20/28085B01J20/267B01J21/063A01N43/16
Inventor 李基凡何漪雯李家骏陈蔚茵陈梅杨启明
Owner NANO & ADVANCED MATERIALS INST
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