Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan.
Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan.
Environ Res. 2022 Sep;212(Pt A):113209. doi: 10.1016/j.envres.2022.113209. Epub 2022 Apr 1.
Magnetic Molecularly imprinted polymers (MMIPs) have been recently recognized as an exceptional tool for monitoring and decontamination of environmental and biological samples of diverse nature. Based on the potential applications as sorbents and biomimetic sensors, herein, a core-shell magnetic-molecularly imprinted polymer (MMIP) was developed as a selective material for separation and sensing of sunset yellow (SY) dye in an aqueous environment and real samples. The MMIP was synthesized via precipitation polymerization using SY as a template, MAA as a functional monomer (chosen based on simulation studies), EGDMA as a cross-linking agent, and AIBN as an initiator. To elaborate the specificity of MMIP, a comparative agent, magnetic non-imprinted polymer (MNIP) was also synthesized. The XRD results showed that the MMIP showed both crystalline and amorphous structure attributed to the presence and polymeric and non-polymeric groups. The FTIR spectra confirmed synthesis of intermediate and final MMIP product. The SEM results showed spherical morphology and porous structure of the MMIP with an average particle size of 0.636 μm in diameter. The MMIP was first employed as a sorbent for the removal of SY from the aqueous environment. The binding experiments performed at optimized operating conditions (pH 2; time 30 min; sorbent dosage 3 mg; sorbate concentration 80 ppm) showed more selectivity when compared with MNIP. The data fitted best to Langmuir's sorption isotherm (Q 359.8 mg/g) and followed the pseudo-second-order kinetic model. The synthesized MMIP was also used as an electrochemical sensor for detection of SY dye in the aqueous environment, which exhibited a linear range of detection as (1.51 × 10 - 1.5 × 10 M). The limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.00413 M and 0.0137 M, respectively. While the R value was found to be 0.997 at optimized analytical conditions. These results suggested that the synthesized MMIP can be applied for the selective separation and quantification of SY dye in sample of diverse nature.
磁性分子印迹聚合物（MMIPs）最近被认为是监测和净化各种性质的环境和生物样品的一种特殊工具。基于作为吸附剂和仿生传感器的潜在应用，本文开发了一种核壳型磁性分子印迹聚合物（MMIP），作为一种选择性材料，用于分离和检测水溶液和实际样品中的日落黄（SY）染料。MMIP 通过沉淀聚合合成，以 SY 为模板，MAA 为功能单体（根据模拟研究选择），EGDMA 为交联剂，AIBN 为引发剂。为了详细说明 MMIP 的特异性，还合成了对比剂磁性非印迹聚合物（MNIP）。XRD 结果表明，MMIP 显示出晶态和非晶态结构，归因于存在聚合和非聚合基团。FTIR 光谱证实了中间产物和最终 MMIP 产物的合成。SEM 结果表明，MMIP 具有球形形貌和多孔结构，平均粒径为 0.636μm。MMIP 首先被用作从水溶液中去除 SY 的吸附剂。在优化的操作条件（pH 2；时间 30 分钟；吸附剂用量 3 毫克；吸附质浓度 80ppm）下进行的结合实验显示，与 MNIP 相比具有更高的选择性。数据最符合朗缪尔吸附等温线（Q 359.8mg/g），并遵循伪二阶动力学模型。合成的 MMIP 还被用作水溶液中 SY 染料的电化学传感器，其检测范围为（1.51×10 - 1.5×10 M）。检测限（LOD）和定量限（LOQ）分别为 0.00413M 和 0.0137M，在优化的分析条件下，R 值为 0.997。这些结果表明，合成的 MMIP 可用于选择性分离和定量不同性质的样品中的 SY 染料。
