Chitosan and mixtures with aqueous biocompatible temperature sensitive polymer as flocculants

被引：21
|
作者：
Schwarz, Simona [1 ]
Montserrat Ponce-Vargas, Sandra [2 ]
Licea-Claverie, Angel [2 ]
Steinbach, Christine [1 ]
机构：
[1] Leibniz Inst Polymerforsch Dresden eV, D-01069 Dresden, Germany
[2] Ctr Grad & Invest, Inst Tecnol Tijuana, Tijuana 22000, BC, Mexico
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2012年 / 413卷
关键词：
Chitosan; Temperature sensitive polymers; Flocculation; Clay; KAOLIN SUSPENSIONS; TIO2; SUSPENSION; CHARGE; POLYCATIONS; COMPACTION; ADSORPTION; SILICA;
D O I：
10.1016/j.colsurfa.2012.03.048
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A novel strategy for faster and better flocculation in solid-liquid separation processes is reported: the use of a natural polyelectrolyte (chitosan) in combination with a biocompatible thermosensitive polymer [poly(N-vinylcaprolactam) (PNVCL)]. Clay dispersions were used as model and evaluated by means of analytical centrifuge, laser diffraction, streaming potential and turbidimetry studies. Results show that at 45 degrees C the density of the sediment is up to 15% higher, as compared to the use of chitosan only. This results from the temperature sensitive behaviour of PNVCL that phase separate expelling water at temperatures higher than it's LCST (32-34 degrees C). By using this strategy the sediment is more compact, contains less water, and contains a very small amount of biodegradable chitosan and biocompatible PNVCL. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：7 / 12
页数：6
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