Abstract
A visible-light-driven photocatalyst, nanohydroxy apatite decorated carboxyl functionalized graphene oxide/zinc oxide nanorod (nHAP@CFGO/ZnR) composite was prepared and well characterized by FTIR, XRD, SEM/EDS, HRTEM, XPS, AFM, Raman, DRS, Surface area analyser, PL and EIS. nHAP@CFGO/ZnR composite exhibited high photoactivity and photostability to degrade the pesticide, chlorpyrifos (CP) in aqueous solutions under visible light. The band gap of the prepared photocatalyst was found to be 2.8 eV which is in the visible region. The maximum adsorption occurs at pH 3.5. The adsorption kinetic and isotherm data were described using pseudo-second-order kinetic model and Sips isotherm model, respectively. The photocatalytic degradation of CP was found to follow first-order kinetics and optimum pH for degradation was found to be 3.0. The regeneration and recyclability of the photocatalyst was examined upto five cycles that confirmed the relative stability of the photocatalyst.
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