Enhanced water-resistant performance of Cu-BTC through polyvinylpyrrolidone protection and its capture ability evaluation of methylene blue†
*a
Abstract
Water instability issues greatly restrict the application of Cu-BTC for cationic dye (e.g. methylene blue (MB)) capture from wastewater. In this contribution, polyvinylpyrrolidone (PVP) thin film was grown in a novel way on the surface of Cu-BTC to construct PVP@Cu-BTC using a facile and rapid one-pot hydrothermal synthesis method, which significantly enhanced the water stability of Cu-BTC. Effects of PVP doping amounts on the water resistance of Cu-BTC and MB capture abilities were systematically investigated. This PVP@Cu-BTC composite impressively exhibited good stabilities whether being soaked in acid, neutral, alkali and boiling aqueous environments. PVP existence in the Cu-BTC structure plays a decisive role in water stability and MB capture capacity. Importantly, MB uptake over Cu-BTC could be obviously increased due to the association effects of PVP surface charge and porous Cu-BTC. Our interesting findings might be favorable for the future design and synthesis of water-stable MOFs with an excellent cationic dye capture ability in practical applications.
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