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Modular polyoxometalate-intercalated layered double hydroxide membranes for molecular sieving and in situ regeneration
Summary
Researchers developed modular polyoxometalate-intercalated layered double hydroxide (LDH) membranes using charge-driven self-assembly for molecular sieving applications. The MgAl-SiW12 membrane demonstrated 4-times higher water permeance (over 130 L/m2/h/bar) than its precursor and achieved over 99% retention of Congo red and Evans blue dyes, with greater than 95% permeance recovery after regeneration.
The design and synthesis of two-dimensional membranes with ultra-high permeability, selectivity, and antifouling properties have been a significant challenge. Herein, we propose a facile approach to design modular polyoxometalate-intercalated layered double hydroxide membranes using a charge-driven self-assembly process. The resultant MgAl-SiW12 membrane shows 4 times higher water permeance (>130 L m−2 h−1 bar−1) than that of its MgAl-NO3 precursor. Excellent retention of >99% for Congo red and Evans blue is achieved by the MgAl-SiW12 membrane, which can be regenerated (permeance recovery > 95%) via a simple UV-vis irradiation cycle. Insertion of the SiW12 cluster into layered double hydroxide allows precise control and modulation of the interlayer’s spacing and hydrophilicity and promotes spontaneous electron migration and interfacial charge carrier separation. Moreover, the ·OH and ·O2− radicals forming during the irradiation process are responsible for the degradation of contaminants.
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