Thermal decomposition of β-FeOOH

• Published in: Materials letters Vol. 58; no. 3; pp. 444 - 448
• Main Authors: Musić, S., Krehula, S., Popović, S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2004
• Subjects: Sulfated β-FeOOH; Thermal decomposition; α-Fe 2O 3; β-FeOOH; Sulfated β-FeOOH; β-FeOOH; Thermal decomposition; α-Fe 2O 3
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/S0167-577X(03)00522-6

β-FeOOH particles were prepared by a forced hydrolysis of the 0.1 M FeCl 3 + 5·10 −3 M HCl solution, whereas sulfated β-FeOOH particles were prepared by forced hydrolysis of the 0.1 M FeCl 3 solution containing 5·10 −3 M quinine hydrogen sulfate (QHS). β-FeOOH particles, as well as sulfated β-FeOOH particles, were thermally treated up to 600 °C. The samples were characterized using DTA, XRD, FT-IR and TEM. β-FeOOH particles showed a cigar-type morphology, whereas bundles of β-FeOOH needles were obtained in the presence of QHS. Heating of β-FeOOH particles at 300 °C and above yielded α-Fe 2O 3 particles. Specific adsorption of sulfate groups showed a strong effect on the thermal decomposition of β-FeOOH particles. Upon heating of sulfated particles between 300 and 500 °C the formation of an amorphous phase and a small fraction of α-Fe 2O 3 were observed. Needle-like morphology of amorphous particles in these samples was preserved. At 600 °C, α-Fe 2O 3 particles were obtained; however, they were much smaller than those obtained by heating a pure β-FeOOH.