EFFECTS OF UROTROPIN ON THE FORMATION OF BETA-FEOOH

beta-FeOOH (akaganeite) in the form of needles, stars, and X- and Y-sh aped particles was produced by hydrolysis of 0.1 M FeCl3 solution at 9 0 degrees C. After 5 h of hydrolysis a pronounced decrease in particle size and the destruction of beta-FeOOH morphologies, with an increase of urotropin concentration from 0.005 M to 0.25 M, were observed by X RD and TEM. The FT-IR spectra indicated that the bands at 833, 690 and 641 cm(-1), typical of beta-FeOOH, were strongly dependent on the cha nges in the structure of beta-FeOOH caused by urotropin. After 7 days of hydrolysis, XRD and the FT-IR spectra showed that alpha-Fe2O3 was t he dominant reaction product for 0.1 M and alpha-FeOOH for 0.25 M urot ropin, respectively. The nature of the observed effects is suggested. (C) 1997 Elsevier Science B.V.