Metal Ions Imprinted Fluorescent Sensor Array:Preparation And Research

Metal ion imprinting as one of the most important development directions of molecular imprinting technique,has been widely attracted in the field of analysis and detection of trace heavy metal ions depending on its specificity recognition,anti-jamming and anti-bad conditions of the outside.Fluorescent imprinted polymer membranes synthesized by surface imprinted technology were used as the sensor elements of the sensor arrays for metal ions detection,and then the cross-selectivity,the adsorption kinetics,the adsorption capacity and the effect of pH on the imprinted membranes were studied.The sensor arrays above could identify and distinguish multiple metal ions by the pattern analysis of principal component analysis(PCA)and BP neural network.Furthermore,the specification of mercury was also determined by the sensor array of metal-ion imprinted membranesThe Zn2+?bb2+ion imprinted polymer membranes were synthesized with 1,10-phenanthroline as both a complex-forming agent and a fluorescent reporter,methacrylic acid as functional monomer by the method of surface modification.The free-radical polymerization was performed within PVDF films.And then the surface morphology of the films before and after the modification was characterized by scanning electron microscopy(SEM).The imprinted membranes showed good anti-interference ability.The limit of detection was 1.2×10'7 mol/L and 3.7×10-7 mol/L and the recovery rate for river water samples was 92.7%-97.3%and 95.3%-95.9%for Zn2+ and Pb2+ion imprinted polymer membranes respectively.The imprinted polymers membranes were synthesized with Zn2+?Co2+?Hg2+?Pb2+as templates;1,10-Phenanthroline as both a complex-forming agent and the fluorescence probe.The free-radical polymerization was performed within PVDF films.The four imprinted membranes were used as a sensor array to detect Zn2+.Pb2+?Co2+?Hg2+?Mn2+Al3+,and the data were analyzed,identified using principal component analysis and artificial neural network(BP).The results showed that principal component analysis can classified the metal ions accurately.And the accuracy rate of qualitative and quantitative detection were 100%and 91.67%respectively.The sensor array can be used for the detection of zinc ion in three brands of zinc gluconate particles,the RSD(relative standard deviation)<5%.At last,the sensor array was composed of Hg2+ion-imprinted polymers(Hg-IIP),C6H5Hg+ion-imprinted polymers(C6H5Hg-IIP)and Ag+ion-imprinted polymers(Ag-IIP)that were synthesized with N-vinylcarbazole as both a complex-forming agent and the fluorescence probe.The cross-selectivity and adsorption kinetics of the membranes have been studied.And Hg2+,C6H5Hg+,CH3Hg+,Cu2+,Ag+were detected by the cross-selective sensor array.The PCA realized the classification of six kinds of metal ions in three different concentrations,and the artificial neural network gave the analysis and detection for mercury compounds.