Citation:

Solís, R., O. Dinc, G. Fang, M. Nadagouda, AND D. Dionysiou. Activation of inorganic peroxides with magnetic graphene for the removal of antibiotics from wastewater. Environmental Science: Nano. RSC Publishing, Cambridge, Uk, 8(4):960-977, (2021). https://doi.org/10.1039/D0EN01280G

Impact/Purpose:

Magnetite-graphene composite was synthesized for activation of inorganic peroxides and Non-radical activation of PMS for the removal of antibiotics in wastewater. The heterojunction of magnetite nanoparticles and graphene is a feasible strategy for the catalytic activation of inorganic peroxides and its application in the treatment of aqueous organic micropollutants.

Description:

Magnetic graphene catalysts were prepared for the removal of antibiotics (sulfamethoxazole, norfloxacin, tetracycline and flumequine) in wastewater. Different proportions of magnetite-graphene from 1:0 to 0:1 were considered to study the catalytic activation of inorganic peroxides, i.e., peroxymonosulfate (PMS), peroxydisulfate and hydrogen peroxide. Graphene nanoparticles were responsible for the catalytic activation, which was most effective in the presence of PMS. A ratio of 20% of magnetite in the solid was enough to achieve complete degradation of antibiotics with high recovery by application of a magnetic field. The catalyst was further tested in a Simulated Urban WasteWater (SUWW), studying the main parameters affecting the process (pH, PMS concentration, catalyst dose, and SUWW concentration), the stability in sequential uses of recycling and the oxidant species involved in the process by inhibitors study. The prepared magnetic catalyst showed high catalytic activity and stability to remove aqueous antibiotics by activating inorganic peroxides through non-radical oxidation.

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