Abstract
The water stability of typical metal–organic frameworks (MOFs) limits the practical applications in water, such as pollutants adsorption. In this work, through the pre-functionalization of hydrophobic methyl groups on the ligand, anionic Bio-MOF-1 was transformed into Bio-MOF-2Me which has excellent water stability, even in acidic and boiling water environments. Bio-MOF-2Me also keeps the negative Zeta potential, enabling it to efficiently adsorbing and separating targeted dyes in mixed aqueous solution of cationic/anionic dyes, with high removal rates of around 99%. According to the Langmuir isotherm model, the maximum adsorption capacity of Bio-MOF-2Me for cationic methyl violet could reach up to 310.2 mg⋅g−1. In order to improve the portability and recyclability of Bio-MOF-2Me-based adsorbents, a mixed matrix membrane (MMM) of Bio-MOF-2Me (Bio-MOF-2Me-MMM) was manufactured. Bio-MOF-2Me-MMM inherits the preferential adsorption and separation properties of Bio-MOF-2Me, which has a maximum adsorption capacity of 157.1 mg⋅g−1 for cationic methyl violet. The adsorption abilities of both Bio-MOF-2Me and Bio-MOF-2Me-MMM own good cyclic reversibility, and the removal efficiency respectively retained 82% (Bio-MOF-2Me) and 72% (Bio-MOF-2Me-MMM) even after five adsorption–desorption cycles. The water stability, good adsorption/separation ability, portability and reusability make ionic Bio-MOF-2Me-MMM a promising candidate for dye wastewater treatment.
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