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Parajuli, D.; Hirota, Koichi; Inoue, Katsutoshi*
Industrial & Engineering Chemistry Research, 48(23), p.10163 - 10168, 2009/11
Times Cited Count：26 Percentile：62.18(Engineering, Chemical)A quaternary amine type sorbent has been prepared by the immobilization of trimethylamine group onto the crosslinked lignophenol matrix. The sorption behavior for a number of metal ions was studied in hydrochloric acid medium. From the batch test of individual metal ion as well as the mixture solution containing equal molar concentration of various metal ions, the sorbent was found to hold selectivity for Au(III), Pd(II), and Pt(IV) ions only with negligible sorption for other metal ions like Cu(II), Co(II), Fe(III), Ni(II), and Zn(II). The sorption kinetics was studied at 303, 323, and 338 K and elucidated the order of sorption of Au(III), Pd(II), and Pt(IV) and from the values of rate constants at different temperatures, the energy of activation has been evaluated. The sorption isotherm study revealed the Langmuir type sorption and from the Langmuir charts the maximum loading capacity of Au(III), Pd(II), and Pt(IV) has been evaluated.
Parajuli, D.; Khunathai, K.*; Adhikari, C. R.*; Inoue, Katsutoshi*; Oto, Keisuke*; Kawakita, Hidetaka*; Funaoka, Masamitsu*; Hirota, Koichi
Minerals Engineering, 22(13), p.1173 - 1178, 2009/10
Times Cited Count：44 Percentile：88.35(Engineering, Chemical)Inoue, Katsutoshi*; Oto, Keisuke*; Yoshizuka, Kazuharu*; Naganawa, Hirochika; Tachimori, Shoichi*
no journal, ,
Lipophilic chitosan containing functional groups of dithiocarbamate (DTC-lipophilic chitosan) was prepared and tested for the selective solvent extraction of minor actinides (MA) from large excess of lanthanides in dilute nitric acid solution. This reagent was found to be soluble not only in chloroform and toluene but also in kerosene, which is very favorable for practical purposes. Although solid chitosan gel chemically modified with functional groups of dithiocarbamate prepared according to the conventional method had exhibited no selectivity to MA over lanthanides, DTC-lipophilic chitosan exhibited high selectivity to americium over europium; i.e., the separation factor of Am/Eu was as high as 1227 in the extraction at pH = 4. In addition, it exhibited the same separation factor at the second solvent extraction test carried out one week after the first test, suggesting that it is chemically stable at least for one week contrary to Cyanex 301 and DPTP.
