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Exposure of humans to Arsenic from groundwater drinking sources is an acute global public health problem, entailing the urgent need for highly efficient/low-cost Arsenite (As III ) up-taking materials. Herein we present an innovative hybrid-material, ZrMO F@SF   d   operating like an “As III -sponge” with unprecedented efficiency of 1800 mg As III  gr −1 . ZrMOF@ SF   d   consists of a neutral Zirconium Metal-Organic Framework [ZrMOF] covalently grafted on a natural silk-fiber ( SF   d  ). ZrMOF itself exhibits As III  adsorption of 2200 mg gr −1 , which supersedes any -so far- known As ΙΙΙ -sorbent. Using XPS, FTIR, BET-porosimetry data, together with theoretical Surface-Complexation-Modeling (SCM), we show that the high-As ΙΙΙ -uptake is due to a sequence of two phenomena:[i] at low As III -concentrations, surface-complexation of H 3 AsO 3  results in As III -coated voids of ZrMOF, [ii] at increased As III -concentrations, the As III -coated voids of ZrMOF are filled-up by H 3 AsO 3   via  a partitioning-like mechanism. In a more general context, the present research exemplifies a mind-changing concept, i.e. that a “partitioning-like” mechanism can be operating for adsorption of metalloids, such as H 3 AsO 3,  by metal oxide materials. So far, such a mechanism has been conceptualized only for the uptake of non-polar organics by natural organic matter or synthetic polymers.

A Hybrid {Silk@Zirconium MOF} Material as Highly Efficient AsIII-sponge