Reaction Steps in Heterogeneous Photocatalytic Oxidation of Toluene in Gas Phase—A Review
Tulebekov Y. Orazov Z. Satybaldiyev B. Snow D.D. Schneider R. Uralbekov B.
September 2023Multidisciplinary Digital Publishing Institute (MDPI)
Molecules
2023#28Issue 18
A review of the current literature shows there is no clear consensus regarding the reaction mechanisms of air-borne aromatic compounds such as toluene by photocatalytic oxidation. Potential oxidation reactions over TiO2 or TiO2-based catalysts under ultraviolet and visible (UV/VIS) illumination are most commonly considered for removal of these pollutants. Along the pathways from a model pollutant, toluene, to final mineralization products (CO2 and H2O), the formation of several intermediates via specific reactions include parallel oxidation reactions and formation of less-reactive intermediates on the TiO2 surface. The latter may occupy active adsorption sites and causes drastic catalyst deactivation in some cases. Major hazardous gas-phase intermediates are benzene and formaldehyde, classified by the International Agency for Research on Cancer (IARC) as Group 1 carcinogenic compounds. Adsorbed intermediates leading to catalyst deactivation are benzaldehyde, benzoic acid, and cresols. The three most typical pathways of toluene photocatalytic oxidation are reviewed: methyl group oxidation, aromatic ring oxidation, and aromatic ring opening.
photocatalytic oxidation , reaction pathways , titanium dioxide , toluene
Text of the article Перейти на текст статьи
Center of Physical-Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, 050012, Kazakhstan
LLP «EcoRadSM», Almaty, 050040, Kazakhstan
Water Sciences Laboratory, Nebraska Water Center, Part of the Daugherty Water for Food Global Institute, University of Nebraska, Lincoln, 68583, NE, United States
Université de Lorraine, CNRS, LRGP, Nancy, F-54000, France
Center of Physical-Chemical Methods of Research and Analysis
LLP «EcoRadSM»
Water Sciences Laboratory
Université de Lorraine
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026