HighlightsFacile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets Ti-O-Si and Ti-O-Al bonds between the titanium(IV) isopropoxide and pozzolan Innovative hybrid pozzolan-based material for Cr(VI) photocatalytic reduction A novel photocatalyst with a short band-gap and high SBET
A photochemical UVC/H2O2 oxidation system was applied for the decolourisation of two real textile wastewaters collected after biological oxidation from two different textile wastewater treatment plants.
This work evaluates the photocatalytic reduction of Cr(VI) to Cr(III) using different catalysts: titanium-based and kaolin-based materials. The assays were conducted in the presence of citric acid/tartaric acid as hole/HO• scavenger, using a tubular photoreactor irradiated by UVA light. The Cr(VI) reduction reaction rate in the presence of titanium nanosheets with pozzolan (TNS-PZ) showed a tenfold increase when compared with commercial TiO2-P25 nanoparticles. The effect of the catalyst loading on Cr(VI) reduction was evaluated using TNT-PZ. Then, at the optimum catalyst loading (100 mg L-1), hybrid kaolin materials with polysiloxanes were also tested. 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-3 reactor s-1 ([Cr(VI)]0=0.20 mM; 100 mgcatalyst L-1 ; [tartaric acid]0:[Cr(VI)]0 molar ratio of 6:1, pH 3.0 and 25 °C). (methyl polysiloxane (MK), methyl-phenyl polysiloxane (H44), tetraethyl ortho silicate (TEOS) and 3-amino-propyltriethoxysilane (APTES).
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