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Open AccessArticle

Insights on the Use of Carbon Additives as Promoters of the Visible-Light Photocatalytic Activity of Bi2WO6

1
POR2E group, CEMHTI, CNRS (UPR 3079), Université d’Orléans, 45071 Orléans, France
2
Instituto Nacional del Carbón (INCAR-CSIC), Apdo. 73, 33080 Oviedo, Spain
3
Department of Chemistry, Royal Military Academy, Renaissancelaan 30, 1000 Brussels, Belgium
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(3), 385; https://doi.org/10.3390/ma12030385
Received: 16 November 2018 / Revised: 18 January 2019 / Accepted: 22 January 2019 / Published: 26 January 2019
(This article belongs to the Special Issue Photocatalytic Materials for Energy and Environmental Applications)
We have explored the impact of the incorporation of various amounts of carbons from varied physicochemical features as additives to Bi2WO6 for the photocatalytic degradation of a dye using simulated solar light. Data has revealed that the composition and acidic character of the carbon additive are important parameters in the performance of the Bi2WO6/carbon catalysts. The presence of a carbon additive improved the conversion of the dye, evidencing the occurrence of charge transfer reactions that involve radical mediated reactions. The catalysts prepared with 2 and 5 wt.% of carbon additive outperformed the bare semiconductor, despite the shielding effect of the carbon matrix. The acidic nature of the Bi2WO6/carbon catalysts governs the degradation pathway (due to the preferential adsorption of the dye), that proceeds via the deethylation of the auxochrome groups of the dye at short irradiation times, followed by the cleavage of the chromophore at long irradiation times. Regarding the characteristics of the carbons, the photocatalytic degradation rate is accelerated by carbons of acidic character and high oxygen content, whereas the porosity seems to play a minor role. The presence of the carbon additives also affects the toxicity of the treated solutions, rendering lower values after shorter irradiation periods. View Full-Text
Keywords: simulated solar light; bismuth tungstate; carbon materials simulated solar light; bismuth tungstate; carbon materials
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Gomis-Berenguer, A.; Eliani, I.; F. Lourenço, V.; J. Carmona, R.; F. Velasco, L.; O. Ania, C. Insights on the Use of Carbon Additives as Promoters of the Visible-Light Photocatalytic Activity of Bi2WO6. Materials 2019, 12, 385.

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