Christopher Femina Carolin, Anbalagan Saravanan, Kumar Ponnusamy Senthil, Pannerselvam Sundar Rajan, Vaidyanathan Vinoth Kumar
Department of Chemical Engineering, SSN College of Engineering, Chennai 603110, India.
Department of Biotechnology, School of Engineering, SRM University, Kattankulathur, Chennai 603203, India.
IET Nanobiotechnol. 2017 Jun;11(4):433-442. doi: 10.1049/iet-nbt.2016.0166.
In this study, chitosan functionalised magnetic nano-particles (CMNP) was synthesised and utilised as an effective adsorbent for the removal of Pb(II) ions from aqueous solution. The experimental studies reveal that adsorbent material has finer adsorption capacity for the removal of heavy metal ions. Parameters affecting the adsorption of Pb(II) ions on CMNP, such as initial Pb(II) ion concentration, contact time, solution pH, adsorbent dosage and temperature were studied. The adsorption equilibrium study showed that present adsorption system followed a Freundlich isotherm model. The experimental kinetic studies on the adsorption of Pb(II) ions exhibited that present adsorption process best obeyed with pseudo-first order kinetics. The maximum monolayer adsorption capacity of CMNP for the removal of Pb(II) ions was found to be 498.6 mg g. The characterisation of present adsorbent material was done by FTIR, energy disperse X-ray analysis and vibrating sample magnetometer studies. Thermodynamic parameters such as Gibbs free energy (Δ°), enthalpy (Δ°) and entropy (Δ°) have declared that the adsorption process was feasible, exothermic and spontaneous in nature. Sticking probability reported that adsorption of Pb(II) ions on CMNP was favourable at lower temperature and sticking capacity of Pb(II) ions was very high.
在本研究中，合成了壳聚糖功能化磁性纳米颗粒（CMNP），并将其用作从水溶液中去除Pb(II)离子的有效吸附剂。实验研究表明，该吸附材料对重金属离子具有良好的吸附能力。研究了影响Pb(II)离子在CMNP上吸附的参数，如初始Pb(II)离子浓度、接触时间、溶液pH值、吸附剂用量和温度。吸附平衡研究表明，当前吸附体系遵循Freundlich等温线模型。对Pb(II)离子吸附的实验动力学研究表明，当前吸附过程最符合准一级动力学。发现CMNP对去除Pb(II)离子的最大单层吸附容量为498.6 mg/g。通过傅里叶变换红外光谱（FTIR）、能量色散X射线分析和振动样品磁强计研究对当前吸附材料进行了表征。热力学参数如吉布斯自由能（Δ°）、焓（Δ°）和熵（Δ°）表明，吸附过程在本质上是可行的、放热的和自发的。粘附概率表明，Pb(II)离子在CMNP上的吸附在较低温度下是有利的，且Pb(II)离子的粘附能力非常高。
