Enhanced arsenite adsorption from water by activated MOF embedded in macroporous chitosan bionanocomposite beads

Water remediation from arsenite [As(III)] is critical to environmental sustainability and human health. Metal-organic frameworks (MOFs) hold great promise for this purpose, while their efficient application requires addressing loading activation issues. Herein, a new bionanocomposite bead UiO-66/CB was fabricated through simple gelation followed by the freeze-casting method of As(III)-contaminated water. Highly accessible UiO-66 nanoparticles are uniformly dispersed within networking pores macroporous chitosan with high activity retention. Moreover, fabrication strategy effectively activated embedded nanoparticles, leading improving utilization efficiency active sites. The millimeter-sized UiO-66/CB-2.0 performed much more efficiently than freely in removing As(III) even exhibited comparable adsorption nanoparticles. maximal sorption capacity onto larger 47.9 mg/g (88.6 mg As/g UiO-66) at pH 7. 1 g/L can reduce levels (200 μg/L) groundwater below 10 μg/L. It could be readily regenerated reused. Fixed-bed column using treat ∼1600 bed volumes As(III)-spiked This research provides versatile route fabricate high-performance convenient MOFs biocomposite adsorbents remediation. • A removal. process retain performance well. Efficient contamination natural groundwater. exhibits treatment volume.