Hydroxy-Copper Interlayering in Montmorillonite by the Titration Method
Shoji Yamanaka, Koichi Numata, Makoto Hattori, 1985. "Hydroxy-Copper Interlayering in Montmorillonite by the Titration Method", Proceedings of the International Clay Conference Denver, 1985, Leonard G. Schultz, H. van Olphen, Frederick A. Mumpton
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Hydroxy-copper montmorillonite was prepared by titrating copper solutions with sodium hydroxide in the presence of Na-montmorillonite. If a copper nitrate solution was used, basic copper nitrate Cu2(OH)3NO3 was precipitated without forming hydroxy-copper interlayers. If a copper acetate solution, however, was titrated similarly in the presence of montmorillonite, the basal spacing of the montmorillonite increased to 20.2 Å, and no basic copper acetate Cu2(OH)3(OCOCH3)H2O was detected until hydroxy-copper layers had fully developed in the interlayer spaces. Chemical analyses showed that the resulting hydroxy interlayers were basic copper acetate, although the amount of acetate ions was small compared with that in Cu2(OH)3(OCOCH3)H2O. A similar hydroxy-copper interlayering occurred in montmorillonite even when Na-montmorillonite was stirred together with freshly precipitated Cu2(OH)3(OCOCH3) H20 in water. The basic copper acetate interlayers decomposed on heating above 300°C, and CuO deposited on the outer surfaces of the montmorillonite.
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Proceedings of the International Clay Conference Denver, 1985
The papers included in this proceedings volume are representative of the research on clays being conducted in all parts of the world at the time of publication. Many of the subjects treated are controversial, and although some ideas expressed may not necessarily represent the views of the editors, the referees, or the publisher, they deserve to be brought to the attention of the international clay community.