AN EXAFS STUDY OF THE AMORPHOUS CUPRUM HYDROXIDE

It was shown that for the bulk cuprum hydroxide the amorphisation is d etermined only by an excess of water without which the Cu(OH)(2) prese nts in the crystal form only. In the case of the supported cuprum hydr oxide, the amorphisation is achieved by stabilisation of the hydroxide particles on a high dispersed silica surface under low concentration of the cuprum ions, so that the sizes of the supported complexes are s mall. The data obtained suggests that the cuprum from dilute solution (4 x 10(-3) M) under low values of pH is adsorbed on the surface SiO2 as a polymer-like structure similar to that of Cu(OH)(2) rather than a s isolated ions. This inference is confirmed by previously obtained re sults on adsorption of Cu2+ On TiO2.