静电纺聚吲哚纳米纤维的制备及其对镉离子的吸附行为  

Preparation of Polyindole Nanofibers and Their Cadium Ion Adsorption Performance

作　　者：蔡志江[1,2] 杨海贞 徐熠[1] 王闯开 

机构地区：[1]天津工业大学纺织学院,天津300387 [2]天津工业大学先进纺织复合材料教育部重点实验室,天津300387

出　　处：《高分子学报》2015年第5期581-588,共8页Acta Polymerica Sinica

基　　金：天津市自然科学基金(基金号11JCYBJC02500)资助项目

摘　　要：以无水氯化铁为氧化剂,采用化学氧化还原法合成了聚吲哚,利用静电纺丝技术制备了聚吲哚导电纳米纤维材料,研究了聚吲哚纳米纤维对重金属Cd2+的吸附行为.FTIR和NMR测试结果表明,化学氧化还原过程中吲哚的聚合是发生在吲哚单体的C2、C3位置.SEM和TEM观察表明,聚吲哚纳米纤维表面较光滑,呈圆柱状、没有珠节;纤维无规分布,平均直径约为145 nm;聚吲哚纳米纤维的比表面积非常高,达73.45 m2/g,其对重金属Cd2+具有良好的吸附能力,在p H=6时其对Cd2+平衡吸附量最大,约为140.36 mg/g,平衡吸附时间约为50 min.热力学分析表明聚吲哚纳米纤维对Cd2+的吸附行为用Freundlich模型描述更合理,动力学分析表明聚吲哚纳米纤维对Cd2+的吸附比较符合准二级动力学模型.再生10次后,其吸附量为100.67mg/g,是最大值的71%,是一种潜在的重金属Cd2+高效吸附材料.Polyindole was synthesized by chemical oxidation using ferric chloride anhydrous as oxidant. Polyindole nanofibers have been successfully prepared by using electrospinning method by dissolving polyindole in acetonitrile. The heavy metal uptake performance of the polyindole nanofibers was presented by adsorption of Cd（Ⅱ） ions from aqueous solution. FTIR and NMR spectra confirm that the polymerization of indole happens at C2, C3 positions of indole unit. Electrospun polyindole nanofibers exhibit cylindrical,uniform,bead-free and random orientation observed by SEM and TEM. The average diameter of the electrospun polyindole nanofibers is about 145 nm and the BET specific surface area is 73.45 m^2/g. Electrospun polyindole nanofibers show good adsorption properties for Cd （Ⅱ） ions from aqueous solution. The equilibrium adsorption capacity is about 140.36 mg/g reached at pH 6 after 50 min. The adsorption isotherm data fit well the Freundlich isothermal model. The kinetic process of Cd （Ⅱ） adsorption by polyindole nanofiber is found to fit the pseudo-second order rate equation. Desorption results show that the adsorption capacity can retain 100.67 mg/g （up to 71% ） after 10 times usage,which indicates that the polyindole nanofibers could be suitable for potential applications in water treatment for the removal of Cd（Ⅱ） ion as a nano-adsorbent.

关 键 词：聚吲哚 纳米纤维 镉离子 吸附 

分 类 号：TQ340.64[化学工程—化纤工业] O647.3[理学—物理化学]