The removal of stickies with modified starch and chitosan¡ªHighly cationic and hydrophobic types compared with unmodified ones
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- 作者：Gudrun Petzold ; Katrin Petzold-Welcke ; Haisong Qi ; Knut Stengel ; Simona Schwarz ; Thomas Heinze
- 关键词：Starch ; Chitosan ; Stickies ; Complex formation ; Polycation ; Hydrophobicity
- 刊名：Carbohydrate Polymers
- 出版年：2012
- 出版时间：6 November, 2012
- 年：2012
- 卷：90
- 期：4
- 页码：1712-1718
- 全文大小：491 K
文摘
The removal of dissolved and colloidal substances (DCS) in paper cycling water, so called stickies, with tailored natural polymers, having cationic as well as hydrophobic groups, was investigated using model suspensions made by the recycling of paper. The sticky content, characterized by the turbidity, the anionic charge, and the total organic carbon content (TOC) was increased by the addition of latex. The dynamic surface tension was established as useful tool for the characterization of the sticky content.
The sticky removal using the starch derivatives (with benzyl- as well as ethyl-substituents), from very low up to high cationic charge and N-(benzyl)chitosan was compared. Depending on the properties of the derivatives two possible mechanisms can be found: ¡°charge dominated removal¡± or ¡°removal dominated by hydrophobicity.¡± It seems that turbidity and TOC are lowered especially due to charge interaction whereas the increase of the surface tension is mainly caused by the hydrophobic character of the modified natural polymers.