{'fraction_non_alphanumeric': 0.02188183807439825, 'fraction_numerical': 0.015317286652078774, 'mean_word_length': 6.093023255813954, '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}}
SYNTHESIS FACTORS THAT IMPACT TiO2 NANOTUBE ACTIVITY DURING GAS-PHASE PHOTOCATALYTIC OXIDATION OF METHANOL

Statistically designed experiments determined which steps in the hydrothermal synthesis of TiO2 nanotubes significantly impacted the rate of photocatalytic oxidation of gas-phase methanol. This study investigated the following synthesis steps: sodium hydroxide treatment time, conductivity of the first and second washings, acid treatment time and pH, calcination temperature, and H2O2 post-treatment. The synthesis procedure produced a highly active photocatalyst; the maximum catalyst activity of the TiO2 nanotubes was approximately seven times that of the starting material, Degussa P-25. Characterization with transmission electron microscopy, X-ray diffraction, and temperature-programmed oxidation revealed that the nanotubes were 10–12 nm in diameter with an average length of approximately 100 nm.