TY - JOUR
T1 - Identification of number and type of cations in water-soluble Cs+ and Na+ calix[4]arene-bis-crown-6 complexes by using ESI-TOF-MS
AU - Kumagai, Shogo
AU - Hayashi, Kotaro
AU - Kameda, Tomohito
AU - Morohashi, Naoya
AU - Hattori, Tetsutaro
AU - Yoshioka, Toshiaki
N1 - Funding Information:
This work was supported by JSPS KAKENHI grant number 17K20058 .
PY - 2018/4
Y1 - 2018/4
N2 - The treatment of cesium-contaminated wastewater has become one of the biggest issues. The selective Cs+ removal from wastewater containing competitive alkali metal ions such as Na+ is desired to reduce the volume of sludge. Therefore, the present work focused on water-soluble calix[4]arene-bis-crown-6 (W-BisC6) to selectively capture Cs+. For characterization of the complex, UV–vis spectroscopy is commonly used, however, due to the limited availability of information it can be hard to quickly identify the specific structures of some complexes. In this work, the electrospray ionization time of flight spectrometry (ESI-TOF-MS) is successfully utilized to identify the number and type of cations in W-BisC6-cation complexes. ESI-TOF-MS accurately recognized 4 types of complex (W-BisC6–Na+, W-BisC6–Cs+, W-BisC6–2Na+, W-BisC6–Na+–Cs+), and the experimental and simulated results were almost perfectly matched. It also revealed the difficulty of W-BisC6–2Cs+ complex formation under the present conditions. Thus, this technique is significantly helpful for rapid identification of the specific structures of complexes during Cs+-contaminated wastewater treatment.
AB - The treatment of cesium-contaminated wastewater has become one of the biggest issues. The selective Cs+ removal from wastewater containing competitive alkali metal ions such as Na+ is desired to reduce the volume of sludge. Therefore, the present work focused on water-soluble calix[4]arene-bis-crown-6 (W-BisC6) to selectively capture Cs+. For characterization of the complex, UV–vis spectroscopy is commonly used, however, due to the limited availability of information it can be hard to quickly identify the specific structures of some complexes. In this work, the electrospray ionization time of flight spectrometry (ESI-TOF-MS) is successfully utilized to identify the number and type of cations in W-BisC6-cation complexes. ESI-TOF-MS accurately recognized 4 types of complex (W-BisC6–Na+, W-BisC6–Cs+, W-BisC6–2Na+, W-BisC6–Na+–Cs+), and the experimental and simulated results were almost perfectly matched. It also revealed the difficulty of W-BisC6–2Cs+ complex formation under the present conditions. Thus, this technique is significantly helpful for rapid identification of the specific structures of complexes during Cs+-contaminated wastewater treatment.
KW - Calixcrown ethers
KW - Cesium
KW - ESI-TOF-MS
KW - Sodium
KW - Water-soluble
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U2 - 10.1016/j.chemosphere.2018.01.040
DO - 10.1016/j.chemosphere.2018.01.040
M3 - Article
C2 - 29348048
AN - SCOPUS:85040663865
VL - 197
SP - 181
EP - 184
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
ER -