Abstract
Electrochemical reduction using a metal-based electrode is a novel method for treatment of Cr (VI)-containing wastewater. However, the removal efficiency with a metal-based electrode is limited by the low conductivity and specific surface area. In this study, a stainless steel (SS) electrode modified with graphene was fabricated and used to reduce Cr (VI) in an electrochemical system. Under the optimal conditions (i.e., the graphene loading of 1.50 mg·cm−2, −0.7 V, pH 1.5 and the electrolyte concentration (Na2SO4) of 10 g·l−1), this composite electrode removed 99.7 ± 0.00% of Cr (VI) with an initial concentration of 10 mg·l−1 in 80 min Cr (VI) was removed by the following pathways: (1) under the additive electric field, Cr (VI) was mainly reduced into Cr (III) directly by accepting electrons, (2) Cr (VI) was reduced to Cr (III) by −OH of graphene, (3) −COOH on the surface of graphene underwent bonding with H+ thereby producing hydrogen bonding to adsorb Cr (VI). Meanwhile, COO− was produced via losing H+ to adsorb Cr (III).
Funder
the National Natural Science Foundation of China
Publisher
The Electrochemical Society
Subject
Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials
Cited by
3 articles.
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