Ion-exchange Reaction of Protonated Layer Compounds with Bi^<3+> Ion(Other Topics,Proceedings of the 13^<th> International Clay Conference)

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Ion-exchange reaction of various protonated layer compounds with Bi^<3+> ion was carried out in order to investigate ion-exchange property of protonated layer compounds for a high valence cation. 14 kinds of protonated layer compounds were used such as HBiNb_2O_7・1.10H_2O (HB), HNb_3O_8・0.97H_2O (HN), H_<0.7>Ti_<1.825>O_4・0.93H_2O (HT), HLaNb_2O_7・0.17H_2O (HLN), HCa_2Nb_3O_<10>・1.2H_2O (HCN), HFe_<0.5>Nb_<1.5>O_5・0.63H_2O (HFN), HTiNbO_5・0.16H_2O (HTN), H_2Ti_3O_7・0.17H_2O (HT237), H_2Ti_4O_9・1.27H_2O (HT249), H_2K_2Nb_6O_<17>・2.0H_2O (HKN), HNbWO_6・1.50H_2O (HNW), H_<1.8>[Bi_<0.2>Ca_<0.8>NaNb_3O_<10>]・1.55H_2O (HBCNN), H_2W_2O_7・1.40H_2O (HW) and α-Zr(HPO_4)_2・H_2O (α-ZrP). The ion-exchange reaction for each compound came to equilibrium longer than 36h. The highest uptake amount of Bi^<3+> ion was observed for HBCNN in which 87% of proton was exchanged. The uptake amount of Bi^<3+> ion decreased in order; HBCNN(87%)>HT(75%)>HT249(72%)>HT237(61%)>HW(60%)>HNW(48%)>HCN(33%)>HTN(27%)>HKN(21%)>HN(18%)>HLN(12%)>α-ZrP(9%)=HFN(9%)>HB(0%). This tendency of the uptake amount of Bi^<3+> ion was discussed by the charge density of protonated layer compounds.
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