Add time:07/28/2019         Source:sciencedirect.com

In the present study, a fluorescent optosensor containing a molecularly imprinted polymer in combination with electrospinning was employed for selective recognition of 2,4-dichlorophenoxyacetic acid (2,4-D). Free radical polymerization was carried out on the surface of polyethersulfone (PES) nanofibers as a substrate using a monomer, initiator, template and a polymerizable 1,8-naphthalimide derivative as the fluorogenic monomer. PES [email protected] molecularly imprinted polymer (PES [email protected]) was produced by means of UV curing. The magnetic PES [email protected] was developed in the same manner as the magnetic Fe3O4 nanoparticles were exerted in the electrospinning of the PES nanofiber. The imprinting factor (IF) was considered 1.97 as a selective character of PES [email protected] versus PES [email protected] The developed sensor was able to selectively determine 2,4-D in a linear range of 1 × 10−7-1 × 10−3 M with limit of detection (LOD) of 1.01 × 10−8 M. The results confirmed that PES [email protected] was satisfactorily able to determine trace concentrations of 2,4-D.

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