IN-SITU FTIR REFLECTION-ABSORPTION SPECTROSCOPIC STUDIES OF CYANIDE AND THIOCYNATE ON COPPER ELECTRODE

The behaviors of cyanide and thiocyanate on copper electrode were studied using cyclic voltammetry and in-situ FTIR spectroelectrochemistry. When potentialwas shifted from -1.60 to 0.30V (vs. SCE), three band near 2076, 2094, and 2170 cm(-1) were recorded within the wavenumber range 2030-2230cm(-1) in 0.5molL(-1) NaCN + 0.5molL(-1) NaF. The bands near 2070 and 2170cm(-1) were due to solution species CN- and surface deposited CuCN respectively. The band near 2094cm(-1) was attributed to absorbed CN- and complex Cu(CN)(3)(2-). In 0.5molL(-1) NaSCN + 0.5molL(-1) NaF, three bands near 2060, 2117 and 2170cm(-1) were observed in the potential range mentioned above, and attributed to the IR absorption of solution species SCN-(2060cm(-1)), absorbed SCN-(2117cm(-1)) and CuNCS(2170cm(-1)) which was the product of electrode reaction.