title: Photocatalytic oxidation of H2S in the gas phase over TiO2-coated glass fiber filter.
abstract: To promote the photocatalytic oxidation (PCO) of hydrogen sulfide (H2S) in the gas phase, TiO2-coated glass fiber filters were packed in an annular photoreactor. Glass fibers coated with TiO2 thin films were characterized structurally and morphologically by field emission gun scanning electron microscopy (FEG-SEM), scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). Flow rate and H2S inlet concentration were evaluated to determine the performance of the reactor. Removal efficiencies up to 99% were achieved for flow rate of 25 L h(-1) (residence time of 121 s) and H2S inlet concentration from 12 to 14 ppmv. The long-term experiment presented H2S removal of 89% for 16 h. After 28 h of continuous use, H2S degradation was observed at 64%, which suggests that the photocatalyst was losing activity due to deactivation. Moreover, the kinetics of the PCO of H2S according to the Langmuir-Hinshelwood (L-H) approach along with the mass balance of a plug-flow reactor was modeled. The reaction constant (k) was calculated at approximately 10.5 μmol m(-3) s(-1) and the adsorption constant (K) of approximately 5263 m(-3) mol with linearity (R2) of 0.98.
authors.affiliation: a Laboratório de Controle da Qualidade do Ar (LCQAr), Departamento de Engenharia Sanitária e Ambiental (ENS) , Universidade Federal de Santa Catarina (UFSC) , Florianópolis , Brasil.
authors.forename: Marlon
authors.initials: M
authors.lastname: Brancher
authors.affiliation: a Laboratório de Controle da Qualidade do Ar (LCQAr), Departamento de Engenharia Sanitária e Ambiental (ENS) , Universidade Federal de Santa Catarina (UFSC) , Florianópolis , Brasil.
authors.forename: Davide
authors.initials: D
authors.lastname: Franco
authors.affiliation: a Laboratório de Controle da Qualidade do Ar (LCQAr), Departamento de Engenharia Sanitária e Ambiental (ENS) , Universidade Federal de Santa Catarina (UFSC) , Florianópolis , Brasil.
authors.forename: Henrique
authors.initials: H
authors.lastname: de Melo Lisboa
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D002384:Catalysis; D005898:Glass / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D000393:Air Pollutants; C009753:fiberglass; C009495:titanium dioxide; D014025:Titanium; D006862:Hydrogen Sulfide
keywords: Photocatalysis; TiO2; glass fiber; hydrogen sulfide; photoreactor