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Gas-phase aromatic compounds degradation by a partially TiO2 coated photoreactor assisted with ozone
Process Safety and Environmental Protection ( IF 4.384 ) Pub Date : 2020-01-18 , DOI: 10.1016/j.psep.2019.12.037
Bárbara Maria Borges Ribeiro; Tânia Miyoko Fujimoto; Bianca Gvozdenovic Medina Bricio; Ursula Luana Rochetto Doubek; Edson Tomaz

Heterogeneous photocatalysis with TiO2 have been studied for VOCs degradation; however, aromatic VOCs degradation lead TiO2 deactivation. The objective of this study was to degrade aromatic VOCs by heterogeneous photocatalysis avoiding TiO2 deactivation. The experiments were conducted using a UV-C lamp (254 nm), relatively humidity (RH – 26 to 60 %), and ozone (O3 – 2.38 to 5.35 %). Due to O3 addition, it was necessary to have uncoated regions in the quartz tube around the lamp to allow UV photons to reach the gas bulk and generate radicals from O3. Different quartz tube coating fractions were tested to analyze its influence on VOCs degradation. The highest toluene degradation was 99.2 % for the reactor with 90 % of coating, 3.4 % of O3, space time of 123 s, and RH of 26 %. It was observed RH greater than 26 % affected the degradation achieved. Ozone addition allowed TiO2 use for 77 hours avoiding early catalyst deactivation. Besides that, the requirement of uncoated regions indicated that VOC oxidative reactions occur both on solid and gas phases. This suggested that the addition of O3 combined with the reactor configuration is a promising alternative for aromatic compound degradation by heterogeneous photocatalysis.
更新日期:2020-01-21

 

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