Mesoporous Organic–Inorganic Core–Shell Necklace Cages for Potentially Capturing Cd2+ Ions from Water Sources

摘要

We report the one-pot synthesis of ball-like nanosphere structures composed of an a-Fe core and an organic shell of ethylenediaminetetraacetic acid that connected together to form a nanochain necklace-like morphology. The hierarchical zigzag nanochain sphere structures have branches growing in clumps, a large surface area, and spherical pore-like cages and entrances for capture/trapping Cd~(2+) ions from water sources. The pH solution (i.e., at pH 5) plays a key role in the generation of actively negative surfaces along the entire nanochain sphere adsorbent, thereby creating surfaces with strong binding affinity to Cd~(2+) ions. The thermodynamic and kinetic characteristics indicated that the nanochain sphere adsorbent with macro- and meso-cage caves and organically decorated surfaces show promise for the spontaneous and endothermic capturing of Cd~(2+) ion containments from water solutions. The zigzag nanochain mesoporous necklace-like structure trapper (MNT) exhibited long-term stability, indicating that it can be used several times (reduced waste volume). The adsorption efficiency and uptake of the deleterious Cd~(2+) ions retained even after multi-particulate processing of reuse cycles. The pHdependent Cd~(2+) ion selectivity indicated high adsorption capacity (526.3 mg·g~(-1)) and Cd~(2+) ion-to-MNT binding affinity, despite the addition of interfering cations or anions. The zigzag nanochain sphere necklace allows the development of a simple and effective adsorbent model for water purification and management of toxins.