Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Gas Phase TiO2 Photosensitized Mineralization of some VOCs: Mechanistic Suggestions Through a Langmuir-Hinshelwood Kinetic Approach

Version 1 : Received: 18 November 2020 / Approved: 19 November 2020 / Online: 19 November 2020 (15:20:44 CET)

A peer-reviewed article of this Preprint also exists.

Bettoni, M.; Falcinelli, S.; Rol, C.; Rosi, M.; Sebastiani, G.V. Gas-Phase TiO2 Photosensitized Mineralization of Some VOCs: Mechanistic Suggestions through a Langmuir–Hinshelwood Kinetic Approach. Catalysts 2021, 11, 20. Bettoni, M.; Falcinelli, S.; Rol, C.; Rosi, M.; Sebastiani, G.V. Gas-Phase TiO2 Photosensitized Mineralization of Some VOCs: Mechanistic Suggestions through a Langmuir–Hinshelwood Kinetic Approach. Catalysts 2021, 11, 20.

Journal reference: Catalysts 2020, 11, 20
DOI: 10.3390/catal11010020

Abstract

A jointed experimental and theoretical investigation pointing out new insights about the microscopic mechanism of the VOCs (volatile organic compounds) photocatalytic elimination by TiO2 has been done. Methane, hexane, isooctane, acetone and methanol have been photomineralized in a batch reactor. Values of K (adsorption constant on TiO2) and k (mineralization rate constant) of the five VOCs (treating the kinetic data through a Langmuir- Hinshelwood approach) have been determined. Recorded K and k values and performed theoretical calculations allowed us to suggest the involvement of an electron transfer step between the VOC and the hole, TiO2(h+), as the rate determining one.

Subject Areas

titanium dioxide; oxidation; photocatalysis; VOCs mineralization; Langmuir-Hinshelwood

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