{'fraction_non_alphanumeric': 0.019792648444863337, 'fraction_numerical': 0.00471253534401508, 'mean_word_length': 5.138728323699422, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
TiO2 Photocatalytic Oxidation of Toluene and PCE Vapor in the Air

Abstract A thin film of TiO2 coated on a glass cylinder was used as the catalyst for the photo-oxidation of toluene and PCE. Two germicide mercury lamps, 4 watts each, were served as the UV source. Effects of light intensity, humidity, reactant concentration, and retention time were examined. The humidity effect indicated that the photocatalytic oxidation of toluene could be through hydroxyl free radicals which needed water molecules to produce. While for PCE, the oxidation mechanism could be through chlorine free radicals which did not need water molecules. The kinetic data of both toluene and PCE photocatalytic oxidation could be described by the Langmuir- Hinshelwood model. The oxidation rate constant of PCE was about 23 times higher than that of toluene. The intermediates identified during the photocatalytic oxidation of PCE were phosgene, trichloro-acetylchloride, and chloroform. For toluene, no significant amount of intermediates other than carbon dioxide could be detected.