Abstract

In order to use nitrogen atoms in polymers as the active adsorption sites for heavy metal ions, an effort has been made to couple polyethyleneimine, a water soluble polymer with polypyrrole, a conjugated polymer for nickel ion adsorption from aqueous solution due to a large number of nitrogen atoms available in the prepared water insoluble polypyrrole-polyethyleneimine (PPy-PEI) polymer nanocomposite. The BET surface area and average particle size of the prepared PPy-PEI nanocomposites were found to be 17 m²/g and ∼ 18–34 nm, respectively. TGA and DSC were used to study the thermal behavior of the composites. The nickel ion adsorption efficiency shown by pristine polypyrrole was found to be 42%, while a much higher adsorption efficiency of 99.8% was observed using polypyrrole-polyethyleneimine (PPy-PEI) nanocomposite in a batch equilibrium system. The optimum adsorption dosage was found to be 0.08 g at a pH of 4.5 and a contact time of 60 mins at room temperature. The ATR-FTIR, XRD and EDX provide the evidence of nickel ion adsorption by PPy-PEI nanocomposites. The adsorption data was well-fitted to Freundlich isotherm model and followed the pseudo-first order kinetic model. The adsorbent can be reused with more than 82% at the 3^rd cycle.

抽象的

为了利用聚合物中的氮原子作为重金属离子的活性吸附位，人们努力将聚乙烯亚胺（一种水溶性聚合物与聚吡咯）偶联，这是一种由于水溶液中大量的镍离子而从水溶液中吸附的共轭聚合物。制备的水不溶性聚吡咯-聚乙烯亚胺（PPy-PEI）聚合物纳米复合物中可利用的氮原子。发现制备的PPy-PEI纳米复合材料的BET表面积和平均粒径为17 m ²/ g和〜18-34 nm。TGA和DSC用于研究复合材料的热性能。发现原始聚吡咯显示的镍离子吸附效率为42％，而在间歇平衡系统中使用聚吡咯-聚乙烯亚胺（PPy-PEI）纳米复合材料观察到的吸附效率更高，为99.8％。发现最佳吸附剂量在pH为4.5的条件下为0.08 g，在室温下的接触时间为60分钟。ATR-FTIR，XRD和EDX提供了PPy-PEI纳米复合材料吸附镍离子的证据。吸附数据非常适合Freundlich等温模型，并遵循拟一级动力学模型。在^第三个循环中，吸附剂的回收率可达到82％以上。