Influence of palladium content dispersed in the TiO2 photocatalyst for degradation of volatile organic compounds in gas emission
2022
da Silveira, Arnaldo Efigênio Castro | Ribeiro, Bárbara Maria Borges | Bricio, Bianca Gvozdenovic Medina | Fujimoto, Tânia Miyoko | Doubek, Ursula Luana Rochetto | Tomaz, Edson
Heterogeneous photocatalysis is highlighted to treat volatile organic compound (VOC) emission. Then, this work analysed the influence of palladium (Pd) content loaded in TiO₂ on n-octane and iso-octane photodegradation. For this, TiO₂ was loaded with Pd in different contents: 0.4%, 0.7%, and 1.0%. The samples were characterized, and the photodegradation experiments were conducted by Pd/TiO₂/UV process. The characterization analyses showed that the metal presence did not change the catalyst structure or its surface area; however, it reduced the bandgap energy. The photocatalytic results proved that palladium improved n-octane degradation from 62% (pure TiO₂) to 92.6% (0.4%Pd/TiO₂) and, iso-octane degradation enhanced from 59% (pure TiO₂) to 90.6% (0.7%Pd/TiO₂); all results were obtained in the space time of 39 s. Therefore, 0.4%Pd/TiO₂ and 0.7%Pd/TiO₂ showed better oxidation results to degradation n-octane and iso-octane, respectively. The kinetic model of pseudo-first order showed a good fit for the data of both VOCs. Heterogeneous photocatalysis with Pd/TiO₂ showed to be an adequate technique to reduce VOCs emission.
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