An ion-imprinted material embedded carbon quantum dots for selective fluorometric determination of lithium ion in water samples

作者：Shao, Honghong; Li, Chunyan; Ma, Changchang^*; Sun, Lin; Chen, Rongru; Cheng, Rujia; Liu, Yang; Yan, Yongsheng; Sun, Qingfeng; Wu, Chunxia^*

来源：Microchimica Acta, 2017, 184(12): 4861-4868.

DOI：10.1007/s00604-017-2493-8

• Surface imprinting
• Fluorescence quenching
• Selective recognition
• Benzo-15-crown-5
• Photoinduced Electron Transfer

An ion-imprinted fluorescent polymer (referred to as CQD@SiO2@IIP) is presented for recognition of lithium ion. The material is based on the use of carbon quantum dots (CQDs) and is prepared by a surface imprinting technique using benzo-15-crown-5 (B15C5) as the complexing agent, methacrylic acid (MAA) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the crosslinker, 2,2-azobisisobutyronitrile (AIBN) as the radical initiator, and lithium ion as the template. After optimization of the detection conditions, the relative fluorescence intensity (F-0/F), best measured at excitation/emission wavelength of 360 nm/460 nm, varies linearly with the Li+ concentration in the range between 0.5 and 50 mu mol.L-1, with a limit of detection of 16 mu mol.L-1. Performance was compared to the non-imprinted material, and the imprinting factor is found to be 4.5. The ion-imprinted fluorescence material was applied to the determination of Li+ in (spiked) water samples and obtained good recoveries ranged from 102 to 111.6%.

• 出版日期2017-12
• 单位江苏大学; 吉林师范大学