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Open AccessFeature PaperArticle

Solar Degradation of Sulfamethazine Using rGO/Bi Composite Photocatalysts

1
Department of Inorganic Chemistry, Faculty of Science, University of Granada, 18071 Granada, Spain
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Department of Inorganic and Organic Chemistry, Faculty of Experimental Science, University of Jaen, 23071 Jaen, Spain
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(5), 573; https://doi.org/10.3390/catal10050573
Received: 6 May 2020 / Revised: 15 May 2020 / Accepted: 18 May 2020 / Published: 20 May 2020
(This article belongs to the Special Issue Photocatalytic Degradation of Organic Wastes in Water)
Heterogeneous photocatalysts for water decontamination were obtained by the optimized synthesis of bismuth-functionalized reduced graphene oxide (rGO/Bi) using the Hummer method and microwave treatment. Sulfamethazine (SMZ) was used as model pollutant to evaluate the photocatalytic efficacy. Photocatalysts were characterized by VP-SEM, HRTEM, XDR, XPS, RAMAN, and FTIR analyses, which confirmed the effective reduction of GO to rGO and the presence of bismuth as a crystalline phase of Bi2O3 polydispersed on the surface. Their performance was influenced by the rGO/Bi ratio, microwave temperature, and treatment time. The as-obtained 5%rGO/Bi composite had the highest photocatalytic activity for SMZ degradation under visible light irradiation (λ > 400 nm), achieving 100% degradation after only 2 h of treatment. The degradation yield decreased with higher percentages of rGO. Accordingly, the rGO/Bi catalysts efficiently removed SMZ, showing a high photocatalytic activity, and remained unchanged after three treatment cycles; furthermore, cytotoxicity tests demonstrated the nontoxicity of the aqueous medium after SMZ degradation. These findings support the potential value of these novel composites as photocatalysts to selectively remove pollutants in water treatment plants. View Full-Text
Keywords: rGO/Bi composites; photocatalysts; microwave; solar radiation; sulfamethazine rGO/Bi composites; photocatalysts; microwave; solar radiation; sulfamethazine
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Fernández-Perales, M.; Rozalen, M.; Sánchez-Polo, M.; Rivera-Utrilla, J.; López-Ramón, M.V.; Álvarez, M.A. Solar Degradation of Sulfamethazine Using rGO/Bi Composite Photocatalysts. Catalysts 2020, 10, 573.

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