金属有機構造体ナノ粒子を組み込んだアルギン酸ナトリウム系三次元膜カプセルによる水中有害金属カチオンの除去
Three-dimensional membrane capsules were fabricated by incorporating UiO-66-OH and UiO-66-(OH)₂ metal-organic framework (MOF) nanoparticles into a sodium alginate biopolymer matrix, and their capacity to remove Cu²⁺ and Cd²⁺ from aqueous solutions and real sewage was systematically assessed. Structural characterization was performed using FTIR, SEM, XRD, EDX, and XPS techniques. Key operational variables—including MOF-NP loading (1–100 wt%), adsorbent dose, contact time, pH (1–8), initial metal concentration (5–1000 mg/L), and temperature (298.15–333.15 K)—were optimized. Langmuir isotherm modeling yielded maximum monolayer uptake capacities of 1375 mg/g for Cd²⁺ and 1575 mg/g for Cu²⁺ using the 3-D SGMMCs-(OH)₂ capsules. Removal efficiency exceeded 80% over six consecutive adsorption cycles, and greater than 70% Cu²⁺ removal was achieved in real electroplating wastewater containing competing ions. Dominant removal mechanisms included electrostatic interactions, ion exchange, inner-sphere coordination, and aromatic ligand exchange, with hydroxyl groups of Zr-OH and BDC linkers playing central roles.
Hydroxyl groups on Zr-OH nodes and BDC aromatic linkers mediate Cu²⁺ and Cd²⁺ adsorption through inner-sphere coordination and aromatic ligand exchange, supplemented by electrostatic interactions and ion-exchange processes facilitated by -OH and -COOH functional groups.
This is basic research at the cellular or molecular level. For human application, inhalation is the most promising delivery route, but inhalation carries explosion risk and concentration matters (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/38582471