Freeze-crosslinking approach for preparing carboxymethyl cellulose nanofiber/zirconium hydrogels as fluoride adsorbents

Sekine, Yurina   ; Nankawa, Takuya ; Sugita, Tsuyoshi   ; Nagakawa, Yoshiyasu*; Shibayama, Yuki; Motokawa, Ryuhei   ; Ikeda-Fukazawa, Tomoko*

A tough carboxymethyl cellulose nanofiber (CMF)/ zirconium (Zr) hydrogel was obtained by freeze cross-linking method. The hydrogel was prepared by adding HCl solution containing Zr to frozen CMF and thawing it. The hydrogel showed high adsorptivity for fluoride. This simple gelation method provides useful insight for developing hydrogel-metal complexes.