Studying Flocculation Mechanism of Chitosan with Pyrene-fluorescence Probe Method

• 作 者: 陈亮 陈东辉 吴重亮
• 机 构: School of Environment Science and Engineering, Donghua University, Shanghai 200051, China,School of
• 出 处: Chinese Journal of Chemistry
• 发表日期: 2003年09期
• 关键词: Probe biodegradable bridging deoxy centration stance incident squared England

A peak/ratio in pyrene-fluorescence spectrum was employed to measure the polarity of micro-environment of chitosan adsorbing pyrene molecules. The authors have in the first time detected the pyrene-fluorescence spectrum of chitosan with different degrees of deacetylation (D.D.), and found the relationship between the flocculation of bentonite colloid by chitosan and the peak/ratio values of different molecular weight (M.W.) and D.D. of chitosan. We find that M.W. plays a key role in the flocculation, but D.D. has limited effect on it. From micro-environmental structure of view, it can be proved that the interparticle bridging rather than charge neutralization dominates the flocculation with chitosan.

A peak / ratio in pyrene-fluorescence spectrum was employed to measure the polarity of micro-environment of chitosan adsorbing pyrene molecules. The authors have the first time detected the pyrene-fluorescence spectrum of chitosan with different degrees of deacetylation (DD), and found the relationship between the flocculation of bentonite colloid by chitosan and the peak / ratio values ​​of different molecular weight (MW) and DD of chitosan. We find that MW plays a key role in the flocculation, but DD has limited effect on it. From micro-environmental structure of view, it can be proved that the interparticle bridging rather than charge neutralization dominates the flocculation with chitosan.