An environmental
strategy for developing sustainable materials
presents an attractive prospect for wastewater remediation. Herein,
a facile, green, and economical strategy is proposed to fabricate
magnetic composite nanoparticles (NPs) toward cationic dye adsorption
and selective degradation. To prepare the composite TiO2-PEI-TA@Fe3O4 NPs, tannic acid (TA) and polyethyleneimine
(PEI) were first used to decorate Fe3O4 NPs
at aqueous solution, and then TiO2 NPs were anchored onto
the surfaces of Fe3O4 NPs based on the catecholamine
chemistry. The chemical composition and microstructure of the obtained
NPs were systematically characterized. The NPs not only exhibited
adsorption ability for the cationic dye of methylene blue (MB) but
also responded to ultraviolet light to selectively degrade the adsorbed
MB, and the removal (adsorption and/or degradation) ratio for MB could
reach 95%. In addition, cyclic experiments showed that the removal
ratio of the composite NPs for MB could still be maintained more than
85% even after five cycles. Given by the above-mentioned advantages,
such a green and facile strategy for combining the adsorption and
degradation methods to construct magnetic nanocomposites exhibits
potential applications in cationic dye selective removal and sustainable
wastewater remediation.
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