摘要
以聚乙烯纳米纤维膜为基膜,通过预辐照触发接枝丙烯酸羟乙酯,随后通过硝酸铈铵引发在聚丙烯酸羟乙酯链上接枝丙烯腈和丙烯酸,最后进行胺肟化反应,合成一种新的偕胺肟基纳米纤维膜吸附剂,并将其命名为AO-PENFM.通过两步接枝的方法可以在聚乙烯膜表面构筑大比表面积的纳米结构吸附层.AO-PENFM的吸附行为使用12 ppm的铀加标溶液进行测试.在100 r/min的25℃恒温水浴摇床中吸附120 h,AO-PENFM对铀的吸附能力为338.14 mg/g.AO-PENFM吸附剂对铀的吸附动力学很好地符合离子扩散模型和拟二级动力学模型,同时吸附等温线数据很好地满足Langmuir模型.
The amidoxime modified polyethylene nanofibrous membrane(AO-PENFM)was prepared by a two-step graft polymerization method and an amidoximation reaction.Firstly,the hydroxyethyl acrylate(HEA)was grafted on polyethylene nanofibrous membrane(PENFM)via pre-radiation induced graft polymerization,then the acrylonitrile(AN)and acrylic acid(AA)were grafted on poly hydroxyethyl acrylate(PHEA)chains by ceric ammonium nitrate(CAN)initiated graft polymerization.Finally,an aminoximation reaction was performed to prepare the novel AO-PENFM adsorbent.This two-step graft method was used to construct a nanostructure adsorption layer with high specific surface areas on the surface of PENFM.The AO-PENFM adsorbent in a uranium solution of 12 ppm after 120 h adsorption performs an excellent adsorption performance of 338.14 mg/g.Simultaneously,the adsorption kinetics conforms to the intraparticle diffusion model and pseudo-second-order model.In addition,the adsorption isotherm data conform to the Langmuir isotherm model.
作者
余瑞
万彩霞
陈鑫
李良彬
YU Rui;WAN Caixia;CHEN Xin;LI Liangbin(National Synchrotron Radiation Laboratory,Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film,CAS Key Laboratory of Soft Matter Chemistry,University of Science and Technology of China,Hefei 230026,China;National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety,Southwest University of Science and Technology,Mianyang 621010,China)
基金
supported by the National Natural Science Foundation of China(51890872,51633009).
关键词
聚乙烯纳米纤维膜
预辐照触发接枝聚合
硝酸铈铵引发接枝聚合
铀吸附
polyethylene nanofibrous membrane
pre-radiation induced graft polymerization
CAN initiated graft polymerization
uranium adsorption
