Chitosan-based flocculants are efficient and biodegradable, possessing the potential application in water treatment. A chitosan-based flocculant, CTS-g-PAM, was prepared via grafting copolymerization. Two main structures of CTS-g-PAM were detected by X-ray photoelectron spectroscopy (XPS), and they related to the different performances of CTS-g-PAM in the treatment of model azo dyeing wastewater in terms of removal efficiency, floc size and zeta potential. CTS-g-PAM with the optimal ratio of CN to -NH- owned the best performance. CN reinforced the interaction between CTS-g-PAM and azo dyes and charge neutralization while the flocs formed in the case were large and compacted. However, excessive CN accelerated itself hydrolysis and leaded to the decomposition of CTS-g-PAM, deteriorating the performance of the flocculant.

中文翻译：

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壳聚糖类絮凝剂的结构与其在偶氮印染废水处理中的性能之间的关系。

基于壳聚糖的絮凝剂是高效且可生物降解的，在水处理中具有潜在的应用。通过接枝共聚制备基于壳聚糖的絮凝剂CTS-g-PAM。X射线光电子能谱（XPS）检测到了CTS-g-PAM的两个主要结构，它们与CTS-g-PAM在模型偶氮染料废水的去除效率，絮体尺寸方面的不同性能有关。和ζ电位。CN与-NH-的最佳比例的CTS-g-PAM具有最佳性能。CN增强了CTS-g-PAM与偶氮染料之间的相互作用并中和了电荷，而在这种情况下形成的絮状物又大又密实。但是，过量的CN会加速其自身的水解并导致CTS-g-PAM分解，从而降低絮凝剂的性能。