Removal of naphthalene from simulated wastewater through adsorption-photodegradation by ZnO/Ag/GO nanocomposite

다국어 초록 (Multilingual Abstract)

In this study, a ZnO/Ag/GO nanocomposite was synthesised and used as photocatalyst for effectivephotodegradation of naphthalene from simulated wastewater under visible light. Chemical andmorphological characterisation were successfully done using XRD, PL, UV–vis, FTIR, XPS, FESEM andHRTEM analytical tools. Photocatalytic degradation experiments werefirst carried out under darkconditions and then under visible-light irradiation. Adsorption study of naphthalene prior tophotocatalysis using synthesised material was thoroughly done by studying the kinetics and adsorptionisotherm models. All as-synthesised materials (ZnO nanoparticles, binary ZnO/Ag, and ternary ZnO/Ag/GO nanocomposites) followed pseudo-second-order kinetics and the Freundlich adsorption isotherm,confirming the adsorption on hetero-structural surface. ZnO/Ag/GO could successfully adsorb 80%naphthalene in 20 min, with 500 mg.g 1 adsorption capacity. High adsorption of naphthalene moleculeson ZnO/Ag/GO surfaces trigger improved photodegradation efficiency upon light irradiation. Incorporationof plasmonic Ag nanoparticles and 2D graphene oxide (GO) to ZnO semiconductor improved thephotocatalytic degradation efficiency of naphthalene, achieving up to 92% degradation in 50 min. Thephotodegradation of naphthalene follows the Langmuir-Hinshelwood kinetics model and was foundacceptable to express the photodegradation rate. Furthermore, the ZnO/Ag/GO photocatalyst could easilybe recycled and reused forfive cycles, maintaining up to 85% of its photodegradation efficiency.

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