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Adsorption Kinetics of 137 Cs + / 90 Sr 2+ on Ca‐Bentonite
Author(s) -
Wang Rong,
Chu Yingying,
Chen Mengjun
Publication year - 2017
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143017x14902968254593
Subject(s) - bentonite , adsorption , diffusion , chemistry , kinetics , nuclear chemistry , inorganic chemistry , analytical chemistry (journal) , chemical engineering , chromatography , thermodynamics , physics , quantum mechanics , engineering
137 Cs + / 90 Sr 2+ adsorption kinetics on natural Ca‐bentonite under the impact of different adsorption conditions was examined in detail. The results indicate that natural Ca‐bentonite shows a strong adsorption capacity for Cs + /Sr 2+ . The adsorption reached at equilibrium after 2 hours for Cs + . Cs + /Sr 2+ removal efficiency reaches the highest when the pH value is 5 to 8 and increases with the increase of Ca‐bentonite adding amount. Cs + removal efficiency increases with the increase of Cs + initial concentration, while Sr 2+ removal efficiency slightly varies around 70%. The adsorption of Cs + /Sr 2+ by Ca‐bentonite follows the pseudo‐second‐order model and is controlled by chemical adsorption. Meanwhile, the results of intraparticle diffusion modelling indicate that intraparticle diffusion is a kinetics controlling step, besides surface adsorption and liquid film diffusion.