Removal of cesium ions from aqueous solution by adsorption onto local Taiwan laterite.
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 DeltaH, DeltaG and DeltaS 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.
Wang
Tsing-Hai
TH
Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300, Taiwan, ROC.
Li
Ming-Hsu
MH
Yeh
Wen-Chun
WC
Wei
Yuan-Yaw
YY
Teng
Shi-Ping
SP
D000327:Adsorption; D002586:Cesium / Q000302:isolation & purification*; D003252:Construction Materials / Q000032:analysis*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D012996:Solutions; D013624:Taiwan; D013696:Temperature; D013816:Thermodynamics; D014867:Water; D014961:X-Ray Diffraction
D012996:Solutions; D014867:Water; D002586:Cesium