Department of Chemistry, University of Pune, Pune 411 007, India.
J Hazard Mater. 2011 Feb 28;186(2-3):2051-9. doi: 10.1016/j.jhazmat.2010.12.132. Epub 2011 Jan 8.
Adsorptive sorbent for bio-aggressive natural aqueous media like seawater was developed by one pot simultaneous synthesis of silver nanoparticles (Ag nps) and poly(ethylene glycol methacrylate phosphate) (PEGMP) by UV-initiator induced photo-polymerization. The photo-polymerization was carried out by irradiating N,N'-dimethylformamide (DMF) solution containing appropriate amounts of the functional monomer (ethylene glycol methacrylate phosphate), UV initiator (α,α'-dimethoxy-α-phenyl acetophenone), and Ag(+) ions with 365 nm UV light in a multilamps photoreactor. To increase mechanical strength, nano-composite sorbent (Ag@PEGMP) was also reinforced with thermally bonded non-woven poly(propylene) fibrous sheet. Transmission electron microscopy (TEM) of the nano-composite sorbent showed uniform distribution of spherical Ag nanoparticles with particles size ranging from 3 to 6 nm. The maximum amount of Ag(0) that could be anchored in the form of nanoparticles were 5±1 and 10±1 wt.% in self-supported PEGMP and poly(propylene) reinforced PEGMP matrices, respectively. Ag@PEGMP sorbent was found to be stable under ambient conditions for a period of six months. Ag@PEGMP composite sorbent did not exhibit growth at all after incubation with pre-grown Escherichia coli cells, and showed non-adherence of this bacteria to the composite. This indicated that composite sorbent has the bio-resistivity due to bacterial repulsion and bactericidal properties of Ag nanoparticles embedded in the PEGMP. Sorption of U(VI) in PEGMP and Ag@PEGMP nano-composite sorbents from well-stirred seawater was studied to explore the possibility of using it for uranium preconcentration from bio-aggressive aqueous streams. The nano-composite sorbent was used to preconcentrate U(VI) from a process aqueous waste stream.
通过 UV 引发剂诱导的光聚合，在一锅法中同时合成了银纳米粒子（Ag nps）和聚（乙二醇甲基丙烯酸酯磷酸盐）（PEGMP），制备了用于生物侵蚀性天然水介质（如海水）的吸附性吸附剂。光聚合是通过在多灯光反应器中用 365nm 的紫外光照射含有适量功能单体（乙二醇甲基丙烯酸酯磷酸盐）、UV 引发剂（α，α'-二甲氧基-α-苯基苯乙酮）和 Ag(+)离子的 N,N'-二甲基甲酰胺（DMF）溶液来进行的。为了提高机械强度，纳米复合材料吸附剂（Ag@PEGMP）也用热粘合无纺聚丙烯纤维片进行了增强。纳米复合材料吸附剂的透射电子显微镜（TEM）显示，球形 Ag 纳米粒子的分布均匀，粒径范围为 3 至 6nm。以纳米粒子形式锚定的最大 Ag(0)量分别为 5±1 和 10±1wt.%，在自支撑 PEGMP 和聚丙烯增强 PEGMP 基质中。Ag@PEGMP 吸附剂在环境条件下稳定，有效期为六个月。Ag@PEGMP 复合吸附剂在与预生长的大肠杆菌细胞孵育后根本没有生长，并且该细菌不附着在复合材料上。这表明复合吸附剂具有生物电阻性，这是由于嵌入 PEGMP 中的 Ag 纳米粒子的细菌排斥和杀菌特性。研究了 PEGMP 和 Ag@PEGMP 纳米复合材料吸附剂从搅拌良好的海水中吸附 U(VI)，以探索从生物侵蚀性水相中预浓缩铀的可能性。该纳米复合材料吸附剂用于从工艺废水流中预浓缩 U(VI)。
