{'fraction_non_alphanumeric': 0.032541776605101144, 'fraction_numerical': 0.014951627088830254, 'mean_word_length': 5.0855614973262036, '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}}
Preparation and Photocatalysis Properties of Bacterial Cellulose/TiO2 Composite Membrane Doped with Rare Earth Elements

Bacterial cellulose (BC) was chosen as a support for nanometer titanium dioxide (TiO2) particles due to its superfine network structure. The composite membrane of TiO2/BC doped with rare earth elements was prepared by a sol-gel method using tetraisopropyl titanate as starting material. Photocatalysis properties of this composite membrane were estimated by using methyl orange as a degradation agent. X-ray fluorescence (XRF) spectra showed that rare earth ions were incorporated into TiO2/BC membrane. X-ray diffraction (XRD) spectra showed that the resulting titanium dioxide was anatase type, which didn't change after doping. Compared with a pure TiO2/BC membrane, photocatalysis efficiency was significantly enhanced for the doped one. The degradation rate of methyl orange solution for a composite membrane doped with Ce4+ was up to 100%, while with La3+ it was was up to 79.7%. The optimal dosage of Ce4+ was 2 mmol/L, while the most suitable concentration of La3+ was 5 mmol/L within the experimental range.