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Improved adsorption properties of granulated copper hexacyanoferrate with multi-scale porous networks
- Lee, Kyoung-Moo, Kawamoto, Tohru, Minami, Kimitaka, Takahashi, Akira, Parajuli, Durga, Kido, Gentoku, Yoshino, Kazunori, Tanaka, Hisashi
- RSC advances 2016 v.6 no.20 pp. 16234-16238
- adsorption, copper, freeze drying, kinetics
- Designed porous copper hexacyanoferrate micro-capsule beads (CuHCF-MCB) were prepared using freeze-drying (FD). Multi-scale porous networks composed of Angstrom, nanometer, and micrometer sizes were obtained in the desired shapes using a simple drying process. They provide special benefits such as fast kinetics and high capacity. The Cs adsorption equilibrium and kinetics fit the pseudo-second-order kinetic model well. The adsorption rate of FD-CuHCF-MCB was improved to about 15 times higher than that of the heat-drying process because of the highly multi-scale porous structure of FD-CuHCF-MCB, which facilitated solution flow and rapid ion-diffusion inside the MCB.