Removal of cesium ions from aqueous solution by adsorption onto local Taiwan laterite

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

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41 Scopus citations

Abstract

Utilization of local Taiwan laterite (LTL) to remove aqueous cesium was investigated in this work under the conditions of various contact time, cesium (Cs) loading and temperature. Experimental results show that adsorption is instantaneous. Freundlich and Langmuir simulation results demonstrate that local Taiwan laterite has high affinity and sorption capacity for Cs at low temperatures, which may be attributed to enhanced desorption as temperature increased. Thermodynamic parameters including ΔH, ΔG and ΔS were calculated and it is indicated that Cs adsorption on LTL is an exothermic, spontaneous and physical adsorption reaction. Moreover, the adsorbed Cs is distributed evenly on the LTL surface, which is confirmed by SEM/EDS mapping images. Furthermore, the absence of apparent shifting or broadening of the kaolinite signal in XRD patterns after Cs adsorption is an indication of the non-expanding characteristic of kaolinite structure.

Original languageEnglish
Pages (from-to)638-642
Number of pages5
JournalJournal of Hazardous Materials
Volume160
Issue number2-3
DOIs
StatePublished - 30 Dec 2008

Keywords

  • Adsorption
  • Isotherm
  • Radionuclides
  • Safety assessment
  • Surface distribution

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