{'fraction_non_alphanumeric': 0.05361930294906166, 'fraction_numerical': 0.03395889186773905, 'mean_word_length': 4.894736842105263, '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}}
Cationic Amorphous Metal–Organic Cage-Based Materials for the Removal of Oxo-Anions from Water

Oxo-anion pollutants pose a serious threat to natural water systems. It is highly necessary to develop cationic porous materials capable of removing oxo-anion from sewage. However, they are relatively rarely reported compared with anionic and neutral materials. Herein, two cationic amorphous metal–organic cage-based solids containing cages of different sizes, namely, aMOC-1 and aMOC-2, were constructed and use for removing oxo-anions from water. Because the cages in these materials have large cavities (with about 3.5 and 4.5 nm in diameter for aMOC-1 and aMOC-2, respectively) and high positive charges (positive +24 for both), both aMOC-1 and aMOC-2 exhibit rapid kinetics in carcinogenic chromate (CrO42– and Cr2O72–) and ReO4– (a surrogate anion of radioactive isotope TcO4–) adsorption. The adsorption equilibrium can be reached within only a few minutes. The adsorption capacities of aMOC-1 for CrO42–, Cr2O72–, and ReO4– are 157.4, 203.8, and 350 mg/g, respectively. Because aMOC-2 contains larger metal–orga...