Saad Hadeel, Nour El-Dien F A, El-Gamel Nadia E A, Abo Dena Ahmed S
Chemistry Department, Faculty of Science, Cairo University Giza 12613 Egypt.
Pharmaceutical Chemistry Department, National Organization for Drug Control and Research (NODCAR) Giza Egypt.
RSC Adv. 2021 Dec 14;11(63):39768-39780. doi: 10.1039/d1ra07833j. eCollection 2021 Dec 13.
We report a new adsorbent nanocomposite material based on matrix-dispersed superparamagnetic iron oxide nanoparticles (SPIONs) in molecularly-imprinted polyaniline for the removal of chlorpyrifos (CPF), a hazardous organophosphate pesticide, from water. The synthesized magnetic molecularly-imprinted polymer (MMIP) was characterized by FTIR spectroscopy, XRD, magnetic susceptibility, DLS, zeta potential measurement, SEM and high-resolution TEM imaging. The average size of the naked SPIONs ranges from 15 to 30 nm according to the high-resolution TEM analysis. Moreover, the adsorption kinetics, thermodynamic parameters (Δ, Δ and Δ), adsorption isotherms and rebinding conditions were investigated in detail. The proposed MMIP has an imprinting factor of 1.64. In addition, it showed a high experimental adsorption capacity of 1.77 mg g and a removal efficiency of nearly 80%. The fabricated MMIP material demonstrated excellent magnetic susceptibility allowing for easy separation using an external magnetic field. The adsorption mechanism of CPF onto the MMIP adsorbent followed the second-order kinetics model and fitted to the Temkin adsorption isotherm. By studying the adsorption thermodynamics, negative Δ values (-1.955 kJ mol at room temperature) were obtained revealing that the adsorption process is spontaneous. Furthermore, the maximum adsorption capacity was obtained at room temperature ( 303 K), neutral pH and using a high CPF concentration.
我们报道了一种基于分子印迹聚苯胺中基质分散的超顺磁性氧化铁纳米颗粒（SPIONs）的新型吸附剂纳米复合材料，用于从水中去除毒死蜱（CPF），一种有害的有机磷酸酯农药。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、磁化率、动态光散射（DLS）、zeta电位测量、扫描电子显微镜（SEM）和高分辨率透射电子显微镜（TEM）成像对合成的磁性分子印迹聚合物（MMIP）进行了表征。根据高分辨率TEM分析，裸SPIONs的平均尺寸范围为15至30nm。此外，还详细研究了吸附动力学、热力学参数（Δ、Δ和Δ）、吸附等温线和再结合条件。所提出的MMIP的印迹因子为1.64。此外，它还显示出1.77mg/g的高实验吸附容量和近80%的去除效率。制备的MMIP材料表现出优异的磁化率，允许使用外部磁场轻松分离。CPF在MMIP吸附剂上的吸附机制遵循二级动力学模型，并符合Temkin吸附等温线。通过研究吸附热力学，获得了负的Δ值（室温下为-1.955kJ/mol），表明吸附过程是自发的。此外，在室温（303K）、中性pH值和高CPF浓度下获得了最大吸附容量。
