In‐situ Growth of UiO‐66‐NH ₂ on Carboxymethylated Cellulose Beads for Enhanced Low Concentration Fluoride Ions Removal From Aqueous Solution

The development of high-capacity and selective adsorbents for fluoride (F^-) removal is hindered by its inherent characteristics, including its small ionic radius, high charge density, strong hydration ability, high mobility and solubility, as well as the weak diffusion driving force at low concentrations. In this study, a novel composite adsorbent was prepared by loading UiO-66-NH₂ onto carboxymethylated cellulose beads (UiO-66-NH₂@CMCBs) via an in-situ generation strategy for efficient adsorption and recovery of F^-. The highly porous structure and abundant surface carboxyl groups of CMCBs provide favorable coordination sites, promoting the growth of UiO-66-NH₂. Under environmental conditions (25°C, pH 7.4), UiO-66-NH₂@CMCBs completely remove F^- from aqueous solutions with an initial concentration of 10.0 mg L^-1. Furthermore, UiO-66-NH₂@CMCBs demonstrated excellent column adsorption performance and outstanding reusability, maintaining a removal efficiency exceeding 80% after 5 cycles. These results highlight the potential of UiO-66-NH₂@CMCBs as an efficient and recyclable adsorbent for the practical treatment of fluoride-contaminated water.