Cd^(2+)-PVA/PA6金属配合纳米纤维的制备及反应动力学分析

Preparation of Cd^(2+)-PVA/PA6 metal chelated nanofibers and analysis of reaction kinetics

利用静电纺丝技术得到PVA/PA6复合纳米纤维,并将其与镉离子(Cd2+)溶液反应,制备Cd2+-PVA/PA6金属配合纳米纤维。采用原子吸收光谱(AAS)测定金属离子浓度,用傅里叶红外光谱(FT-IR)对PVA/PA6复合纳米纤维和Cd2+-PVA/PA6金属配合纳米纤维的相应吸收峰进行分析,用扫描电子显微镜(SEM)对其形貌进行表征。结果表明,PVA/PA6纳米纤维具有优异的金属离子配合性能和良好的形态稳定性。同时研究了金属离子吸附过程及动力学参数,得出吸附常数Kl=0.025 7 L/mmol、饱和离子配合量Qm=4.464 3 mmol/g、相关系数R2=0.997,该反应过程符合兰格缪尔吸附模型。

PVA/PA6 composite nanofibers were formed by electrospinning and then reacted with Cd2＋ solution to prepare Cd2＋-PVA/PA6 metal chelated nanofibers.The metal ions（Cd2＋） concentration was determined by atomic absorption spectrophotometry（AAS）;the morphologies were characterized by scanning electronic microscopy（SEM）;and the major absorption peaks were assigned by means of Fourier transform infrared（FT-IR） spectrography.The result shows that PVA/PA6 composite nanofibers have excellent adsorption capacity for metals ions such as Cd2＋ and good shape stability.The absorption process and kinetics parameters of metal ions were also studied in this work.The saturated amount of coordinated Cd2＋（Qm） was 4.464 3 mmol/g（dry fiber）,the adsorption constant（Kl） was 0.025 7 L/mmol,and the correlation coefficient R2=0.997.The process of reaction was corresponding with Langmuir model.