Facile Synthesis Of A Sandwiched Ti3c2tx Mxene/Nzvi/Fungal Hypha Nanofiber Hybrid Membrane For Enhanced Removal Of Be(Ii) From Be(Nh2)(2) Complexing Solutions

Two-dimensional metal carbides or nitrides (MXenes) demonstrate various excellent properties; however, their poor permeability precludes their application in water treatment. In this study, Ti3C2Tx MXene/nZVI/fungal hyphae nanofiber hybrid membranes (MXene/nZVI@FH) were prepared by chemical-intensive precipitation method for the robust capture of Be(II) from a beryllium-ammonia complexing solution. Interestingly, the MXene/nZVI@FH membrane showed favorable water permeability (6.10 x 10(-15) m(2)), which was approximately 301 times higher than that of a pure Ti3C2Tx membrane, and 99.8% Be(II) was captured from the Be(NH2)(2) complexing solution with an extremely low concentration (19.85 ppm). Specifically, the maximum Be(II) adsorption capacity of MXene/nZVI@FH was calculated to be 95.20 mg/g from the Be(NH2)(2) complexing solution at pH 5.0 and 35 degrees C. Various characterization results (e.g., SEM, FTIR, XRD, VSM and XPS) suggested that Be(II) prefers to coordinate with surface oxygen groups bonded to the MXene nanosheets by forming BeO and BeO22- bidentate inner-sphere complexes. Furthermore, due to its reticular sandwiched structure, MXene/ nZVI@FH could be easily activated and reused by leaching with 0.1 M HCl solution. Thus, it is a promising hybrid membrane for the removal and recovery of Be(II) from a Be(NH2)(2) complexing solution.