Electrochemical preparation of graphene from waste battery-electrodes directed to organic dyes removal in aqueous solution

Huyen Tran Thi Thu, Ngan Duong Thi, Ly Hoang Thanh, Hong Phi Thi Thuy, Hoang Tran Vinh

Abstract


In this research, we present a new method for preparation of graphene from waste zinc carbon battery (ZCB) electrodes using electrochemically exfoliation via a intercalating of sulfate ions into the graphitic layers at different D.C. voltages and optimized conditions (i.e., electrolyte medium and applied voltage). The synthesized graphene was characterized by X-ray diffraction (XRD), Raman spectroscopy and Scanning/Transmission electron microcopy (SEM/TEM). The synthesized graphene has been used as the adsorbents for efficient removal of methylene blue (MB) as a cationic dye from aqueous solutions to test their qualities. Results shown that the equilibrium adsorption capacity (qe) of prepared graphene samples are from 92.32 mg.g-1 to 99.73 mg.g-1 which are extremly higher than that of the pristine waste graphite electrode (5.03 mg.g-1) or powdered  waste electrode graphite (40.05 mg.g-1). These obtaned results indicated that the graphene can be produced from waste graphite electrodes by electrochemical method, which can be considered as an eco-friendly method not only for production of quality graphene but also for reuse of waste graphite electrodes.

Keywords


waste battery-electrodes; graphite; graphene; electrochemical; organic dyes; adsorption

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References


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DOI: https://doi.org/10.51316/jca.2021.045

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