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Forced hydrolysis of FeCl3 solutions in the presence of sodium dextran sulphate

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Abstract

The effect of sodium dextran sulphate (Mw = 500,000) on the forced hydrolysis of FeCl3 solutions was investigated using a microwave-assisted method. Reference samples obtained upon 10 to 120 min of forced hydrolysis of the FeCl3 solution showed the presence of an α-Fe2O3 phase alone. After 10 min of the forced hydrolysis of FeCl3 in the solution containing sodium dextran sulphate, α-Fe2O3 and additionally β-FeOOH precipitated. The Mössbauer spectra of α-Fe2O3 precipitated in the presence of sodium dextran sulphate showed a significant broadening of spectral lines accompanied by decreased values of the hyperfine magnetic field. This was explained by lower α-Fe2O3 crystallinity. The FESEM of reference α-Fe2O3 samples showed cube-like particles of good uniformity in the submicrometer range. In the presence of dextran sulphate polymer, the α-Fe2O3 particles of varying sizes and close to egg-like shape were obtained as a result of the specific adsorption of sulphates on the oxide surface and steric conditions created by dextran branches.

Graphical abstract

Right side: Effect of sodium dextran sulphate on the size and shape of α-Fe2O3 particles produced by the forced hydrolysis of FeCl3 solutions in the presence of microwave irradiation; Left side: reference α-Fe2O3 particles.

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Funding

This research was funded by the Croatian Science Foundation and European Regional Development Fund—the Competitiveness and Cohesion Operational Programme: Project Nos: IP-2016- 06-8254 and KK.01.1.1.01.0001.

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Correspondence to Mira Ristić.

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Ristić, M., Mitar, I. & Musić, S. Forced hydrolysis of FeCl3 solutions in the presence of sodium dextran sulphate. Colloid Polym Sci 297, 177–182 (2019). https://doi.org/10.1007/s00396-018-4450-4

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  • DOI: https://doi.org/10.1007/s00396-018-4450-4

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