Preparation and electrochemical property of TiO2/Nano-graphite composite anode for electro-catalytic degradation of ceftriaxone sodium

Abstract

Titanium dioxide/Nano-graphite (TiO2/Nano-G) composite was synthesized by a sol-gel method and TiO2/Nano-G electrode was prepared in hot-press approach. The composite was characterized by X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FT-IR), scanning electrons microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The electrochemical performance of the TiO2/Nano-G anode electrode was investigated through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electro-catalytic performance was evaluated by the yield of OH radicals, degradation of methyl orange and ceftriaxone sodium. The results demonstrated that TiO2 nanoparticles were dispersed on the surface and interlamination of the Nano-G uniformly, TiO2/Nano-G electrode owned higher electro-catalytic oxidation activity and stability than Nano-G electrode. Degradation rate of ceftriaxone sodium within 120min by TiO2(40)/Nano-G electrode was 97.7%. And OH radicals given by TiO2/Nano-G electrode was higher than that of Nano-G electrode and DSA (Ti/IrO2-RuO2) electrode. The excellent electro-catalytic performance could be ascribed to the admirable conductive property of the Nano-G and more production of OH offered by TiO2(40)/Nano-G electrode.