TY - JOUR
T1 - Synergistic effect of Sr 2+ and ReO 4 − adsorption on hexadecyl pyridinium-modified montmorillonite
AU - Luo, Wuhui
AU - Inoue, Akihiro
AU - Hirajima, Tsuyoshi
AU - Sasaki, Keiko
N1 - Funding Information:
Financial support was provided to KS by Japan Society for Promotion of Science (JSPS) KAKENHI Grant Number JP16H02435 . A student scholarship was provided to WL by the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT). Raman and XPS spectra were collected at the center of advanced instrumental analysis, Kyushu University.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Simultaneous adsorption of Sr 2+ and ReO 4 − , which are surrogates of 90 Sr 2+ and 99m TcO 4 − , on hexadecyl pyridinium (HDPy + )-modified montmorillonite (HDPy/Mt) was investigated. When the amount of HDPy + corresponding to 0.92 times the cation exchange capacity (CEC) of Mt was added, the obtained composite (HDPy/Mt–0.92) showed considerable adsorption capacities for Sr 2+ and ReO 4 − . Some HDPy + desorbed from the Mt layer in the presence of ReO 4 − , providing negatively charged sites on the Mt surface for Sr 2+ adsorption. The desorbed HDPy + interacted with ReO 4 − and was trapped in the composite in the form of HDPy–ReO 4 , resulting in adsorption of ReO 4 − . At high initial concentrations of ReO 4 − , the HDPy configuration changed after adsorption because of the desorption–adsorption process, which was supported by X-ray diffraction. Based on the results of X-ray photoelectron spectroscopy, in the binary system (i.e., Sr 2+ and ReO 4 − ), Sr 2+ uptake occurred in the interlayer space, while adsorption of ReO 4 − occurred on the external surface and probably in the interlayer space. Desorption–adsorption and ion exchange account for Sr 2+ uptake, while adsorption of ReO 4 − was mainly attributed to desorption–adsorption. Compared with the one-adsorbate system, a synergistic effect of simultaneous adsorption of Sr 2+ and ReO 4 − was found in the two-adsorbate system.
AB - Simultaneous adsorption of Sr 2+ and ReO 4 − , which are surrogates of 90 Sr 2+ and 99m TcO 4 − , on hexadecyl pyridinium (HDPy + )-modified montmorillonite (HDPy/Mt) was investigated. When the amount of HDPy + corresponding to 0.92 times the cation exchange capacity (CEC) of Mt was added, the obtained composite (HDPy/Mt–0.92) showed considerable adsorption capacities for Sr 2+ and ReO 4 − . Some HDPy + desorbed from the Mt layer in the presence of ReO 4 − , providing negatively charged sites on the Mt surface for Sr 2+ adsorption. The desorbed HDPy + interacted with ReO 4 − and was trapped in the composite in the form of HDPy–ReO 4 , resulting in adsorption of ReO 4 − . At high initial concentrations of ReO 4 − , the HDPy configuration changed after adsorption because of the desorption–adsorption process, which was supported by X-ray diffraction. Based on the results of X-ray photoelectron spectroscopy, in the binary system (i.e., Sr 2+ and ReO 4 − ), Sr 2+ uptake occurred in the interlayer space, while adsorption of ReO 4 − occurred on the external surface and probably in the interlayer space. Desorption–adsorption and ion exchange account for Sr 2+ uptake, while adsorption of ReO 4 − was mainly attributed to desorption–adsorption. Compared with the one-adsorbate system, a synergistic effect of simultaneous adsorption of Sr 2+ and ReO 4 − was found in the two-adsorbate system.
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U2 - 10.1016/j.apsusc.2016.10.135
DO - 10.1016/j.apsusc.2016.10.135
M3 - Article
AN - SCOPUS:84994008664
VL - 394
SP - 431
EP - 439
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -