摘要
本文选用纳米SiO2为造孔剂,将酰胺化杯[8](Amide-Cal[8])、聚丙烯腈(PAN)、纳米SiO2进行混纺,获得SiO2/Amide-Cal[8]/PAN复合纳米纤维。在碱性条件下,将SiO2移除后得到多孔Amide-Cal[8]/PAN复合纳米纤维。研究了SiO2掺杂量对复合纳米纤维形貌的影响。研究了刻蚀前后纳米复合纤维Amide-Cal[8]/PAN对金属Sr^2+的吸附能力。实验结果显示,SiO2移除后,由于纤维比表面积的增加,杯芳烃有效吸附位点的增加,复合纳米纤维的吸附性能明显提升。掺杂5wt%SiO2的复合纳米纤维,经刻蚀后的复合纳米纤维Sr^2+的吸附量最高为507.6 mg·g^-1,比未掺杂SiO2的Amide-Cal[8]^-15/PAN的吸附能力提高了1倍。多孔Amide-Cal[8]/PAN复合纳米纤维对Sr^2+的吸附等温模型既符合Langmuir吸附等温模型,也遵循Freundlich吸附等温模型,理论推算最大吸附量q m可达到527.21 mg·g^-1。
In this paper,SiO2 nanoparticles were used as a pore-forming agent.Composite nanofibers of SiO2/Amide-Cal[8]/PAN were prepared by electrospinning.The electrospinning solution was made up from amide-Calix[8]arene(Amide-Cal[8]),polyacrylonitrile(PAN)and SiO2 nanoparticles.Under alkaline conditions,porous Amide-Cal[8]/PAN composite nanofibers were obtained by removing SiO2.The effect of SiO2 doping on the morphology of composite nanofibers was studied.The adsorption capacity of Sr^2+on Amide-Cal[8]/PAN before and after etching SiO2 was studied.The experimental results showed that after SiO2 nanoparticles were removed,the adsorption performance of the composite nanofibers was significantly improved due to the increase of the specific surface area of the fibers and the effective adsorption sites of calixarenes.For the 5wt%SiO2 doped composite nanofiber,the adsorption capacity of Sr^2+after etching SiO2 was up to 507.6 mg·g^-1,which was twice higher than that of Amide-Cal[8]/PAN without doping SiO2.The adsorption isothermal model of Sr^2+on porous Amide-Cal[8]/PAN composite nanofibers conforms to both the Langmuir adsorption isothermal model and the Freundlich adsorption isothermal model.Theoretically,the maximum adsorption capacity q m can reach 527.21 mg·g^-1.
作者
束影
钱琛
王元有
房伟
吴化雨
陈铭
SHU Ying;QIAN Chen;WANG Yuan-you;FANG Wei;WU Hua-yu;CHEN Ming(Department of Chemical Engineering,Yangzhou Polytechnic Institute,Yangzhou 225127,China;School of Chemical&Engineering,Yangzhou University,Yangzhou 225002,China)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2020年第8期1482-1488,共7页
Chemical Research and Application
基金
江苏高校“青蓝工程”(苏教师[2018]12号)资助。
关键词
杯芳烃衍生物
多孔复合纳米纤维
静电纺丝
吸附模型
锶离子
Calixarene derivatives
porous composite nanofibers
electrospinning
adsorption isotherm
Sr 2+
