A capacitive sensor for 2,4-D determination in water based on 2,4-D imprinted polypyrrole coated pencil electrode

作者：Prusty Arun Kumar; Bhand Sunil^*

来源：Materials Research Express, 2017, 4(3): 035306.

DOI：10.1088/2053-1591/aa6386

• MIP
• NIP
• Electropolymerization
• Capacitance
• EIS
• Polypyrrole
• PGE

A capacitive sensor for 2,4-dichloro phenoxy acetic acid(2,4-D) determination in drinking water has been developed using molecularly imprinted polypyrrole on pencil graphite electrode (PGE). Molecular imprinted polymer (MIP) coated PGE was prepared by electropolymerization of pyrrole via chronopotentiometry in the presence of 2,4-D as the template molecule. The prepared electrodes were characterized by field emission gun-scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The capacitance change of MIP electrode was measured in the presence of 2,4-D using EIS. The developed capacitive sensor exhibited a linear range 0.06-1.25 mu g l(-1) 2,4-D with limit of detection of 0.02 mu g l(-1) and good selectivity towards 2,4-D in water with recovery from 92 to 110%. The results suggest the viable applicability of the MIP/PGE based sensor for the determination of the 2,4-D in water samples.

• 出版日期2017-3