Photocatalytic degradation of H2S in the gas-phase using a continuous flow reactor coated with TiO2-based acrylic paint

• Published in: Environmental technology 2019-07, Vol.40 (17), p.2276-2289
• Main Authors: Lied, Eduardo Borges, Morejon, Camilo Freddy Mendoza, Basso, Rodrigo Leonardo de Oliveira, Trevisan, Ana Paula, Bittencourt, Paulo Rodrigo Stival, Fronza, Fábio Luiz
• Format: Article
• Language: English
• Subjects: Continuous coating; Continuous flow; Deactivation; fiber cement; Flow rates; Flow velocity; heterogeneous photocatalysis; Hydrogen sulfide; Kinetics; Photocatalysis; Photocatalytic paint; Photodegradation; Reaction kinetics; Reactors; rutile; Scanning electron microscopy; TiO; Titanium dioxide; X-ray diffraction
• ISSN: 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2018.1440010

For the photocatalytic degradation of the hydrogen sulphide (H 2 S) in the gas-phase it was developed a rectangular reactor, coated with acrylic paint supported on fiber cement material. The surface formed by the paint coverage was characterized structural and morphologically by scanning electron microscopy with energy dispersive X-ray and X-ray diffraction analysis. The flow rate and the inlet concentration of H 2 S were evaluated as operational performance parameters of the reactor. Removal efficiencies of up to 94% were obtained at a flow rate of 2 L min −1 (residence time of 115 s) and inlet concentration of 31 ppm of H 2 S. In addition, the H 2 S degradation kinetics was modelled according to the Langmuir-Hinshelwood (L-H) model for the inlet concentrations of 8-23 ppm of H 2 S. The results suggest that flow rate has a more important influence on photocatalytic degradation than the inlet concentration. It is assumed that H 2 S has been oxidized to , a condition that led to a deactivation of the photocatalyst after 193 min of semi-continuous use.