Effects of ph and concentration on cs ions sorption and diffusion in crushed granite by using batch and modified capillary method

Tsing Hai Wang, Ming Hsu Li, Yuan Yaw Wei, Shi Ping Teng

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

Acomprehensive evaluation of Cs ions sorption to and diffusion in crushed granite was conducted in this study. The sorption capacity of crushed granite suggested by the Langmuir model was 5.48 × 10-6 mol-Cs/g-granite. The distribution coefficient (Kd) was around 7.5 mL/g and pH independent. By using an in-diffusionmethod with amodified capillary column, some diffusion relevant parameters of Cs ions in crushed granite were derived. The apparent diffusion coefficient (Da) seemed unaffected by Cs concentration (1.15 × 10-10 to 2.82 × 10-10 m2/s, at 10-7 and 10-3 M, respectively). The determined effective diffusion coefficients (De) were located in the window from 8.59 × 10-10 (10-7 M) to 1.69 × 10-9 (10-3 M) m2/s. Under various pH environments, pH independent Da (9.0 × 10-9m2/s) and De (1.0 × 10-9m2/s) values were observed. Under current systems, consistently higher De than Da implied the diffusion of Cs ions was governed by surface diffusion phenomenon.Whereas the pH insensitive feature indicated the Cs sorption to crushed granite was mainly through ion-exchange reaction. Moreover, further SEM/EDS mapping clearly showed the adsorbed Cs ions were highly concentrated on the fracture surface of biotite.

原文???core.languages.en_GB???
頁(從 - 到)748-754
頁數7
期刊Journal of the Chinese Chemical Society
56
發行號4
DOIs
出版狀態已出版 - 2009

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