| Autor: |
Costa, Igor G. F., Ribeiro, Stella R. F. L., Nascimento, Lucas L., Patrocinio, Antonio Otavio T., Cardoso, Vicelma L., Batista, Fabiana R. X., Reis, Miria H. M. |
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| Zdroj: |
Environmental Science & Pollution Research; May2023, Vol. 30 Issue 22, p62508-62521, 14p |
| Abstrakt: |
Heterogenous photocatalysis is a suitable alternative for wastewater treatment. The supporting of the solid catalyst in a porous material is suggested to facilitate catalyst recovery and reuse. Here we propose for the first time the evaluation of supporting silver (Ag)-decorated titanium dioxide (TiO2) catalysts on internal and external surfaces of alumina hollow fibers with asymmetric pore size distribution. The produced catalysts were considered for Cr(VI) photoreductions. The ultrasound-assisted process potentialized the distribution of Ag nanoparticles on the TiO2 surface. The loading of Ag nanoparticles at concentrations greater than 5 wt% was necessary to improve the TiO2 activity for Cr(VI) photoreduction. The loading of Ag nanoparticles at 30 wt% improved the Cr(VI) photoreduction of the single TiO2 catalyst from 40.49 ± 0.98 to 55.00 ± 0.83% after 180 min of reaction. Suspended and supported Ag-decorated TiO2 catalysts achieved total Cr(VI) photoreduction after 21 h of reaction. The adjusted reaction rate constant with the externally supported Ag-TiO2 catalyst was 3.57 × 10−3 ± 0.18 × 10−3 min−1. Similar reaction rate constants were achieved with suspended and internally supported catalysts (approximately 2.70 × 10−3 min−1). After 10 sequential reuses, all catalysts presented similar Cr(VI) photoreductions of approximately 66%. Nevertheless, the use of the externally supported catalyst is suggested for Cr(VI) photoreductions due to its superior catalyst activity at least in the first reuse cycles. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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