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Molecularly imprinted poly(4,4′-methylenedianiline) for selective electrochemical detection of dibenzothiophene
Iranian Polymer Journal ( IF 3.1 ) Pub Date : 2020-03-14 , DOI: 10.1007/s13726-020-00804-w
Esmail Mohseni , Mohammad Reza Yaftian , Hassan Shayani-jam , Abbasali Zamani , Farideh Piri

Self-cross linked poly(4,4′-diaminodiphenylmethane) was prepared by an oxidative polymerization. Also a molecular imprinted polymer was prepared by employing 4,4′-diaminodiphenylmethane as the functional monomer, ammonium persulfate and dibenzothiophene as the oxidizing agent and template, respectively. It is suggested that the π–π stacking effect between 4,4′-methylenedianiline and dibenzothiophene induced the compact imprinted polymer and the formation of more imprinted sites. Field emission scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and FTIR spectroscopy were used for the characterization of the synthesized polymers. The removal of template molecules leads to the preparation of molecularly imprinted polymer (MIP), which was subsequently used as an electrode material for the preparation of an electrochemical sensor for the detection of dibenzothiophene. Electrochemical behavior of dibenzothiophene on the sensors' construction based upon the application of imprinted (MIP) and non-imprinted (NIP) polymers was investigated in 0.1 mol L−1 of LiClO4 (as the supporting electrolyte), by means of cyclic voltammetry. The obtained cyclic voltammograms of the MIP electrode showed one irreversible anodic peak at ~ 1.5 V. This peak was attributed to the electrochemical oxidation of dibenzothiophene to dibenzothiophene sulfoxide. The current variation acquired through the developed imprinted sensors as a function of dibenzothiophene concentration was linear in the concentration range of 60–150 mg L−1. The corresponding limit of detection was calculated as 11 mg L−1. The imprinted sensor showed a significantly improved sensitivity towards the investigated analyte rather than that observed using a non-imprinted polymer.

中文翻译:

分子印迹聚(4,4'-亚甲基二苯胺)用于选择性电化学检测二苯并噻吩

通过氧化聚合制备自交联的聚(4,4'-二氨基二苯基甲烷)。另外,通过使用4,4'-二氨基二苯基甲烷作为功能单体,过硫酸铵和二苯并噻吩作为氧化剂和模板来制备分子印迹聚合物。这表明4,4'-亚甲基二苯胺和二苯并噻吩之间的π-π堆积效应诱导了紧密的印迹聚合物和更多印迹位置的形成。场发射扫描电子显微镜,X射线衍射,差示扫描量热法和FTIR光谱用于表征合成的聚合物。模板分子的去除导致分子印迹聚合物(MIP)的制备,随后将其用作电极材料,以制备用于检测二苯并噻吩的电化学传感器。在0.1 mol L中研究了基于印迹(MIP)和非印迹(NIP)聚合物的二苯并噻吩在传感器结构上的电化学行为通过循环伏安法测定-1的LiClO 4(作为支持电解质)。所获得的MIP电极的循环伏安图在〜1.5 V处显示一个不可逆的阳极峰。该峰归因于二苯并噻吩电化学氧化为二苯并噻吩亚砜。通过开发的压印传感器获得的电流变化随二苯并噻吩浓度的变化在60–150 mg L -1的浓度范围内呈线性关系。计算出相应的检出限为11 mg L -1。印迹传感器显示出对所研究分析物的灵敏度大大提高,而不是使用非印迹聚合物观察到的灵敏度。
更新日期:2020-03-14
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