Abstract
The forced hydrolysis of FeCl3-HCl solution in the presence of surfactants such as sodium dodecyl sulphate (SDS), cetyltrimethyl ammonium chloride (CTAC), polyoxyethylene (20) nonylphenyl ether (NP-20) and poly(oxyethylene-oxypropylene) (PE-64) has been carried out and the precipitated particles were characterized by various techniques. No effect on the morphology of the precipitates was observed for CTAC and NP-20. The addition of a small amount of PE-64 progressed the particle growth but PE-64 yielded small lemon-shape α-Fe2O3 particles at high concentration. On the other hand, the morphological uniformity of α-Fe2O3 particles was impaired and they changed to needleor rod-like α-FeOOH particles with increase in the SDS concentration. The α-Fe2O3 particles formed with SDS showed a high selective adsorption of H2O and CO2, although α-FeOOH particles have no such selectivity. The α-FeOOH particles thus prepared exhibited a low porosity on the heat treatment in vacuo.
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