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• W3162771054 endingPage "110166" @default.
• W3162771054 startingPage "110166" @default.
• W3162771054 abstract "Forced hydrolyses of FeCl 3 solutions in the presence of Cr 3+ ions without alkali addition were investigated at 160 and 200 °C. These precipitation systems were compared to corresponding reference systems. The isolated precipitates were characterized with XRD, 57 Fe Mössbauer, FT-IR, FE SEM and photocatalytic measurements. Although chromium was not detected by EDS (Energy Dispersive X-ray Spectroscopy), the analysis of samples precipitated in the presence of Cr 3+ ions showed several effects which can be attributed to the presence of these ions in the starting solutions. These effects are specifically well pronounced for samples obtained at 200 °C. For the highest concentration of Cr 3+ ions and upon heating at 200 °C the transformation kinetics β-FeOOH to α-Fe 2 O 3 was impeded. Relative intensities of prominent diffraction lines 104 and 110 of α-Fe 2 O 3 changed as a result of the presence of Cr 3+ ions. Changes in the size and formation of lemon-like particles instead of cube-like α-Fe 2 O 3 particles were also noticed. The presence of Cr 3+ ions in hydrolysing FeCl 3 solution influenced the photocatalytic degradation of rhodamine B. Since no specific adsorption of Cr 3+ ions occurred in the acidic pH medium, it was inferred that traces of Cr 3+ ions enter into the structural tunnels of β-FeOOH crystals. The associates Cl − -Cr 3+ are formed, which in the next step destabilize the crystal structure of β-FeOOH particles. Cr 3+ ions leave the crystal structure upon dissolution of β-FeOOH. It can be assumed that α-Fe 2 O 3 crystals start to grow on very fine and thin β-FeOOH crystallites which were not completely dissolved, but were previously affected by Cr 3+ ions. • Cr 3+ ions influenced forced hydrolysis of FeCl 3 solutions at pH < 2. • Cr 3+ ions did not change the unit-cell parameters of β-FeOOH and α-Fe 2 O 3 . • Cr 3+ ions influenced the crystallite size and particles shape. • Cr 3+ ions inhibited α-Fe 2 O 3 crystallization and influenced its photoactivity. • The origin of these effects was suggested." @default.
• W3162771054 created "2021-05-24" @default.
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• W3162771054 date "2021-09-01" @default.
• W3162771054 modified "2023-10-16" @default.
• W3162771054 title "Forced hydrolysis of FeCl3 solutions in the presence of Cr3+ ions" @default.
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• W3162771054 doi "https://doi.org/10.1016/j.jpcs.2021.110166" @default.
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