Synthesis of amphoteric starch-based grafting flocculants for flocculation of both positively and negatively, charged colloidal contaminants from water
Synthesis of amphoteric starch-based grafting flocculants for flocculation of both positively and negatively, charged colloidal contaminants from water
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DOI：
10.1016/j.cej.2014.01.083
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发表时间：
2014-05-15
影响因子：
15.1
通讯作者：
Cheng, Rongshi
中科院分区：
文献类型：
--
作者：
Yang, Zhen;Wu, Hu;Cheng, Rongshi
真实水中的污染物通常很复杂。悬浮胶体颗粒的表面电荷可以是负的，也可以是正的。本文以不同接枝率成功合成了一系列两性淀粉基接枝絮凝剂（3-氯-2-羟丙基三甲基氯化铵改性淀粉-接枝聚丙烯酰胺-共丙烯酸）SCPAMPAA，并将其用于水中不同带电荷污染物的去除。不同的SCPAMPAA絮凝剂由于其结构特性的不同，表现出明显不同的絮凝性能和絮凝机理。因此，精确控制絮凝剂的分子结构对获得理想的絮凝性能具有重要意义。为了提供预测絮凝剂制备的实际操作可行性，推导了制备配方与SCPAMPAA结构特征之间的定量数学关系。最终设计的絮凝剂在最佳投加量、絮凝窗口和pH敏感性方面均表现出较高的絮凝性能，可同时去除目标废水中的带正电荷和带负电荷的胶体污染物。(C) 2014 Elsevier B.V.版权所有
Contaminants in real water are normally complicated. Surface charges of suspended colloidal particles can be either negative or positive. In this work, a series of amphoteric starch-based grafting flocculants (3-chloro-2-hydroxypropyl trimethyl ammonium chloride modified starch-graft-poly(acrylamide-co-acrylic acid)) denoted as SCPAMPAA were successfully synthesized with different grafting ratios and used for the removal of different charged contaminants from water. Various SCPAMPAA flocculants exhibited remarkably different flocculation performance and obeyed diverse flocculation mechanisms due to the differences in their structural characteristics. Therefore, precise control of the molecular structure of flocculants is of great significance to obtain the desired flocculation performance. To provide practically operational feasibility for the preparation of a predicted flocculant, a quantitative mathematical correlation between the preparation recipe and the structural features of SCPAMPAA were derived. The final well-designed flocculant demonstrated a high flocculation performance in aspects of optimal dosage, flocculation window and pH sensitivity for the removal of both negatively and positively charged colloidal contaminants from targeted wastewater. (C) 2014 Elsevier B.V. All rights reserved.