LAUSR

Benzoic acid is a kind of extensively used preservative. It is of great significance to detect benzoic acid by a rapid method for quality assurance and protection in the fields of pharmaceutical, food and chemistry industry. The present research is aimed to prepare polyaniline/Al bismuthate composite nanorods by an in-situ polymerizing process for effective detection of benzoic acid. The polyaniline/Al bismuthate composite nanorods are prepared by an in-situ polymerizing process. The structure, morphology and electrochemical performance of the obtained polyaniline/Al bismuthate composite nanorods are analyzed by X-ray diffraction (XRD), transmission electron microscopy and electrochemical measurement. XRD and transmission electron microscopy observations show that the amorphous nanoscale polyaniline particles attach to the surface of the crystalline nanorods. The electrochemical measurement of 2 mM benzoic acid using the composite nanorods modified glassy carbon electrode (GCE) shows that a pair of semi-reversible CV peaks is located at -0.11 V (cvp1) and -0.48 V (cvp1′), respectively. The electrochemical responses of 2 mM benzoic acid at the composite nanorods modified GCE are enhanced with increasing the scan rate and benzoic acid concentration. The polyaniline/Al bismuthate composite nanorods modified GCE shows a linear range of 0.001-2 mM with the limit of detection (LOD) of 0.18 µM. The composite nanorods may be used as the electrode materials with good reproducibility and stability for the detection of benzoic acid.