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Citation: Wang Xinping, Shen Zhiquan, Zhang Yifeng. On the Mechanism of Separation Performance Improvement of Chitosan Membrane by Addition of H₂SO₄[J]. Chinese Journal of Applied Chemistry, ;1999, 16(2): 69-72. shu

On the Mechanism of Separation Performance Improvement of Chitosan Membrane by Addition of H₂SO₄

1.
a College of Fiber Engineering, Zhejiang Institute of Silk Technology, Hangzhou 310033;
2.
b Department of Polymer Science and Engineering, Zhejiang University, Hangzhou

Received Date: 4 September 1998
Available Online: 17 December 1998
Fund Project:

The separation factor (α_{water/ethanol}) of chitosan(CS) membrane was increased from 10.2 to 499 by addition of sulfuric acid to the water/ethanol mixture. The mechanism of the improvement has been investigated. It appeared that protonization of NH₂ groups in CS decreases the ability of the more or less neutral ethanol molecules to pass through the CS membrane, increasing its adsorption selectivity to water molecules. In addition, partially crosslinking between CS chains may occur as a result of the reaction of SO₄^2- with -NH₃⁺, that greatly increases the water permeability of the CS membrane.
- chitosan,
- pervaporation membrane,
- water/ethanol mixture,
- sulfuric acid
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On the Mechanism of Separation Performance Improvement of Chitosan Membrane by Addition of H₂SO₄