"Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania.
"Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania.
J Environ Manage. 2018 Jul 15;218:31-38. doi: 10.1016/j.jenvman.2018.04.056. Epub 2018 Apr 14.
Cationic pullulan derivatives have been synthesized and evaluated, for the first time, as flocculants for the separation of the commercial pesticides, Novadim Progress (organophosphoric type), Bordeax mixture and Karate Zeon (pyrethroid type) from synthetic wastewater. The investigated polymer samples contained either pendent tertiary amine or quaternary ammonium salts groups. The separation efficiency was followed by UV-Vis spectroscopy, while the information regarding the mechanism involved in the separation of pesticide particles have been obtained by zeta potential. UV-Vis spectroscopy data showed strong pesticide particles/polycation interactions in case of Novadim Progress and Bordeaux mixture (maximum pesticide removal between 90% and 98%). Good separation efficiency (around 80%) of Karate Zeon emulsion was also noticed. The zeta potential measurements indicated that the charge neutralization was the common flocculation mechanism for the removal of these pesticides. In addition, the hydrogen bondings and chelation of copper ions by amide and/or tertiary amino groups of the polycations had a noteworthy contribution to the pesticide removal.
阳离子化支链淀粉衍生物已被合成并评估，这是首次将其用作絮凝剂，从合成废水中分离商品农药 Novadim Progress（有机磷类）、Bordeax 混合物和 Karate Zeon（拟除虫菊酯类）。所研究的聚合物样品中含有或悬垂的叔胺或季铵盐基团。通过紫外-可见光谱法跟踪分离效率，而涉及农药颗粒分离机制的信息则通过动电电位获得。紫外-可见光谱数据表明，Novadim Progress 和 Bordeaux 混合物中的农药颗粒/聚阳离子之间存在强烈的相互作用（最大农药去除率在 90%至 98%之间）。还注意到 Karate Zeon 乳液的良好分离效率（约 80%）。动电电位测量表明，电荷中和是去除这些农药的常见絮凝机制。此外，酰胺和/或聚阳离子中的叔氨基与铜离子的氢键和螯合对农药的去除也有显著贡献。
