分子印迹碳微球的制备及对偶氮染料选择性吸附和高灵敏度检测

Preparation of Molecularly Imprinted Carbon Microspheres for Selective Adsorption and High Sensitivity Detection of Azo Dyes

以纤维素碳微球为内核,以活性艳红K-2BP染料为模板分子,采用蒸馏-沉淀法合成了K-2BP表面印迹碳微球(K-2BP-MIPs)。染料动力学吸附研究表明K-2BP-MIPs对模板分子K-2BP的最大吸附容量可达881 mg·g^(-1)。以Al_(x)Fe_(y)-MOF为导电糊剂,制备了K-2BP-MIPs和Al_(x)Fe_(y)-MOF共修饰的铁糊电极(FPE)用来构建分子印迹电化学传感器。采用循环伏安法(CV)和电化学阻抗法(EIS)研究了印迹电化学传感器的性能,结果表明该传感器在检测K-2BP时,孵育后和洗脱后的电流响应差值与K-2BP浓度在1.0×10^(-11)~5.0×10^(-7)mol·L^(-1)范围呈良好线性关系,检测限(S/N=3)是3.3×10^(-12)mol·L^(-1)。此外,传感器检测K-2BP时的电流响应差值分别是检测甲基红、活性黑五和亚甲基蓝的2.8、2.8和2.4倍,说明其具有良好的特异性。该印迹聚合物无论是在吸附还是检测方面,都具有优异的性能,在检测印染废水的排放方面有一定的应用价值。

In this paper,using cellulose-derived carbon microspheres as a carrier and K-2BP as a template molecule,K-2BP surface-imprinted carbon microspheres(K-2BP-MIPs)were synthesized by distillation precipitation method.The kinetic adsorption study shows that the maximum adsorption capacity of K-2BP-MIPs for template molecule K-2BP can reach 881 mg·g^(-1).Using Al_(x)Fe_(y)-MOF as the conductive paste,an iron paste electrode co-modified with K-2BP-MIPs and Al_(x)Fe_(y)-MOF was prepared to construct a molecularly imprinted electrochemical sensor.Cyclic voltammetry(CV)and electrochemical impedance method(EIS)were used to study the performance of the imprinted sensor.The results showed a good and stable linear relationship between the difference in the current response and the concentration of K-2BP in the range of 1×10^(-11)-5×10^(-7)mol·L^(-1).The detection limit was 3.3×10^(-12)mol·L^(-1)(S/N=3).In addition,the difference in current response of K-2BP is 2.8,2.8 and 2.4 times that of methyl red,reactive black five and methylene blue,respectively,indicating that the sensor has good specific selectivity.The imprinted polymer has excellent performance in both adsorption and detection,and has certain application value in detecting the discharge of printing and dyeing wastewater.