Kamboh Muhammad Afzal, Wan Ibrahim Wan Aini, Rashidi Nodeh Hamid, Zardari Liaquat Ali, Sanagi Mohd Marsin
a Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia , Johor , Malaysia.
b Department of Chemistry, Shaheed Benazir Bhutto University, Shaheed Benazirabad , Sindh , Pakistan.
Environ Technol. 2019 Aug;40(19):2482-2493. doi: 10.1080/09593330.2018.1444100. Epub 2018 Mar 22.
Magnetic nanocomposites adorned with calixarene were successfully prepared by immobilizing diethanolamine functionalized -butylcalix[4]arene (DEA-Calix) onto silica-coated magnetic nanoparticles (MNPs). The synthesis, surface morphology, purity, elemental composition and thermal stability of newly prepared nanocomposites were analyzed using FT-IR spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), X-ray diffractometer (XRD), thermal gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). Magnetic solid-phase adsorption (MSPA) was employed to explore the adsorption behavior of DEA-Calix-MNPs towards Pb(II) from water samples prior to its flame atomic absorption spectrometric analysis. The essential analytical factors governing the adsorption efficiency such as solution pH, mass of adsorbent, concentration and contact time have been investigated and optimized. The results depict that DEA-Calix-MNPs has excellent adsorption efficiency 97% (at pH 5.5) with high adsorption capacity of 51.81 mg g for Pb(II) adsorption. Additionally, kinetic and equilibrium studies suggested that Pb(II) adsorption process follows a pseudo-second-order model and Langmuir isotherms, respectively. Real sample analysis also confirmed field applicability of the new DEA-Calix-MNPs adsorbent.
通过将二乙醇胺功能化的对叔丁基杯[4]芳烃（DEA - Calix）固定在二氧化硅包覆的磁性纳米颗粒（MNPs）上，成功制备了杯芳烃修饰的磁性纳米复合材料。使用傅里叶变换红外光谱（FT - IR）、扫描电子显微镜（SEM）、能量色散光谱（EDX）、X射线衍射仪（XRD）、热重分析（TGA）和振动样品磁强计（VSM）对新制备的纳米复合材料的合成、表面形态、纯度、元素组成和热稳定性进行了分析。在火焰原子吸收光谱分析之前，采用磁性固相吸附（MSPA）研究了DEA - Calix - MNPs对水样中Pb(II)的吸附行为。研究并优化了影响吸附效率的关键分析因素，如溶液pH值、吸附剂质量、浓度和接触时间。结果表明，DEA - Calix - MNPs具有优异的吸附效率，在pH 5.5时对Pb(II)的吸附率为97%，吸附容量高达51.81 mg/g。此外，动力学和平衡研究表明，Pb(II)的吸附过程分别遵循准二级模型和朗缪尔等温线。实际样品分析也证实了新型DEA - Calix - MNPs吸附剂的现场适用性。
