Source: https://www.proceedings.blucher.com.br/article-details/photocatalytic-reduction-of-crvi-using-different-hybrid-materials-titanium-nanosheetspozzolan-and-kaolinpolysiloxanes-28561
Timestamp: 2019-04-22 18:12:41+00:00

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This work evaluates the photocatalytic reduction of Cr(VI) to Cr(III)using different catalysts: titanium-based and kaolin-based materials. The assays wereconducted in the presence of citric acid/tartaric acid as hole/HO• scavenger, using atubular photoreactor irradiated by UVA light. The Cr(VI) reduction reaction rate in thepresence of titanium nanosheets with pozzolan (TNS-PZ) showed a ten-fold increasewhen compared with commercial TiO2-P25 nanoparticles. The effect of the catalystloading on Cr(VI) reduction was evaluated using TNT-PZ. Then, at the optimumcatalyst loading (100 mg L-1), hybrid kaolin materials with polysiloxanes were alsotested. The best results were obtained using kaolin+methyl polysiloxane as catalyst,resulting in a catalyst reactivity in combination with the photoreactor of 0.12 mmolCr(VI)m-3reactor s-1 ([Cr(VI)]0=0.20 mM; 100 mgcatalyst L-1; [tartaric acid]0:[Cr(VI)]0 molarratio of 6:1, pH 3.0 and 25 °C).
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NOVACK, A. M; HACKBARTH, F. V; MARINHO, B. A; DOS REIS, G. S; VALLE, J. A. B; ULSON DE SOUZA, A. A; VILAR, V. J. P; SOUZA, S. M. A. G; "PHOTOCATALYTIC REDUCTION OF Cr(VI) USING DIFFERENT HYBRID MATERIALS: TITANIUM NANOSHEETS/POZZOLAN AND KAOLIN/POLYSILOXANES", p. 594-597 . In: . São Paulo: Blucher, 2018.

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