School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China.
School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China.
Carbohydr Polym. 2016 Oct 20;151:565-575. doi: 10.1016/j.carbpol.2016.06.002. Epub 2016 Jun 2.
In the present work, a new flocculant, polyacrylamide-grafted chitosan nanoparticles (NCS-g-PAM), was synthesized by the copolymerization of acrylamide (AM) and chitosan nanoparticle (NCS) under ultraviolet irradiation using 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone as photo-initiator. The NCS was prepared by the ionic gelation between chitosan and sodium tripolyphosphate. The structure and morphology of NCS-g-PAM were characterized by Fourier Transform Infraredspectroscopy (FT-IR), X-ray diffraction, (1)H-nuclear magnetic resonance spectrometry, scanning electron microscopy, and thermogravimetric analysis. The factors affecting the intrinsic viscosity and the yield of copolymer were studied, which showed that the optimum conditions for the synthesis of NCS-g-PAM were mAM:mNCS=8:1, 0.15g of initiator dosage, mCS:mTPP=4.5:1, 1min of ultrasonication time, 4h of illumination time, and 30min of stirring time. The NCS-g-PAM was found to be more effective than NC-g-PAM in the flocculation of both kaolin suspension and Cu(2+) simulated wastewater. With 5mg/L of polyaluminium chloride (PAC) coordinated and 1mg/L of NCS-g-PAM it was confirmed to be appropriate for flocculating kaolin suspension.
在本工作中，通过在紫外光照射下用 2-羟基-4'-(2-羟基乙氧基)-2-甲基苯丙酮作为光引发剂使丙烯酰胺（AM）与壳聚糖纳米粒子（NCS）共聚，合成了一种新型絮凝剂-接枝壳聚糖纳米粒子的聚丙烯酰胺（NCS-g-PAM）。NCS 通过壳聚糖和三聚磷酸钠之间的离子凝胶化作用制备。通过傅里叶变换红外光谱（FT-IR）、X 射线衍射、（1）H 核磁共振谱、扫描电子显微镜和热重分析对 NCS-g-PAM 的结构和形态进行了表征。研究了影响特性粘数和共聚物产率的因素，结果表明，NCS-g-PAM 的最佳合成条件为：mAM：mNCS=8：1，引发剂用量 0.15g，mCS：mTPP=4.5：1，超声时间 1min，光照时间 4h，搅拌时间 30min。结果表明，NCS-g-PAM 在高岭土悬浮液和 Cu（2+）模拟废水中的絮凝效果均优于 NC-g-PAM。在 5mg/L 聚合氯化铝（PAC）配位和 1mg/L NCS-g-PAM 条件下，高岭土悬浮液的絮凝效果最为理想。
