Adsorption–photodegradation synergetic removal of methylene blue from aqueous solution by NiO/graphene oxide nanocomposite

• NiO/GO nanocomposite could be prepared via a hydrothermal method.
• Removal of MB using adsorption and photodegradation activity was investigated.
• A remarkable 97.54% of MB was achieved by coupled photodegradation and adsorption.

Nickel oxide/graphene oxide (NiO/GO) nanocomposite was prepared by a hydrothermal method combining a subsequent calcination process. X-ray diffraction (XRD), Raman spectrometer (Raman), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS) methods were used for the characterization of nanocomposite. Removal of aromatic heterocyclic dye methylene blue (MB) from aqueous solution using adsorption and photodegradation activity of NiO/GO nanocomposite was investigated. The effects of NiO/GO nanocomposite dose, pH, and contact time on the removal efficiency of MB were also investigated. Compared with that in the dark, NiO/GO nanocomposite shows a faster and higher removal efficiency by the photodegradation and adsorption under visible light irradiation. A remarkable removal efficiency of MB achieved 97.54% by NiO/GO nanocomposite after 2 h. It could be concluded that synergy of photodegradation and adsorption has a significant progress for removal of MB under visible light compared with that of only adsorption without light.

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