PHOTOCATALYTIC REDUCTION OF Cr(VI) USING DIFFERENT HYBRID MATERIALS: TITANIUM NANOSHEETS/POZZOLAN AND KAOLIN/POLYSILOXANES

PHOTOCATALYTIC REDUCTION OF Cr(VI) USING DIFFERENT HYBRID MATERIALS: TITANIUM NANOSHEETS/POZZOLAN AND KAOLIN/POLYSILOXANES

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

Pôster:

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). 

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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DOI: 10.5151/cobeq2018-PT.0165

Referências bibliográficas

• [1] JAISWAL, R.; PATEL, N.; KOTHARI, D. C.; MIOTELLO, A. Improved visible light photocatalytic activity of TiO2 co-doped with Vanadium and Nitrogen. Appl. Catal. B, Environ., v. 126, p. 47–54, 2012. LITTER, M. I. Last advances on TiO2 -photocatalytic removal of chromium, uranium and arsenic. Curr. Opin. Green Sustain. Chem, v. 6, p. 150–158, 2017. MARINHO, B. A.; CRISTÓVÃO, R. O.; DJELLABI, R.; LOUREIRO, J. M.; BOAVENTURA, R. A. R.; VILAR, V. J. P. Photocatalytic reduction of Cr(VI) over TiO2- coated cellulose acetate monolithic structures using solar light. Appl. Catal. B, Environ, v. 203, p. 18–30, 2017. SALIM, M. M. F. F.; NOVACK, A.; SOARES, P. A.; MEDEIROS, Â.; GRANATO, M. A.; SOUZA, A. A. U.; VILAR, V. J. P.; GUELLI, S. M. A. Photochemical UVC/H2O2 oxidation system as an effective method for the decolourisation of bio-treated textile wastewaters: Towards onsite water reuse. RSC Adv, v. 6, n. 93, p. 90631-90645, 2016.

Como citar:

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.
ISSN 23591757, DOI 10.5151/cobeq2018-PT.0165