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Citation: SUN Zhen-ya, HUANG Jiang-bo. Effect of Dextran on the Crystallization of Ferric Hydroxide[J]. Acta Physico-Chimica Sinica, ;2006, 22(02): 172-177. doi: 10.3866/PKU.WHXB20060209 shu

Effect of Dextran on the Crystallization of Ferric Hydroxide

1.
School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, P. R. China； The Center of Research and Analysis of Materials, Wuhan University of Technology, Wuhan 430070, P. R. China

Received Date: 2 August 2005
Available Online: 22 January 2006

The initial nucleation and phase transformatin process of the Fe(OH)3 gel in five different mineralization systems with different dextran concentrations(from 0～2.0%(w) and the same [Fe3＋]=0.012 mol•L-1) have been investigated. The mineralizational phases in the initial stage were characterized by FTIR, XRD and ICP-AES spectrometry. The results showed that the concentration of Fe3＋ ions in supernatant increased suddenly in the third day during aging and then its secondary reduction stage occurred. There were the same chages of pH as [Fe3＋] in these process. The initial phases formed in the systems with dextran were mainly β-FeOOH, not α-FeOOH which growing rapidly in the system without dextran. The dextran molecules were adsorbed on the surfaces of iron oxide particles by complexing with Fe3＋. The adsorbed dextran molecules would facilitate the phase transformation from β-FeOOH into α-Fe2O3 by a dissolution-recrystallization mechanism. The secondary reduction stage of [Fe3＋] corresponded to the process of the phase transformation from β-FeOOH into α-Fe2O3. With the increasement of the concentrations of dextran (up to 2.0%(w)) in solution, the dissolution of β-FeOOH and the formation of α-Fe2O3 in these mineralization systems were accelerated. It was clear that dextran molecules could control the nuclei type and its phase transformation of the Fe(OH)3 gel.
- Biomineralization;Dextran;Ferric hydroxide gel;Transformation;Dissolution-recrystallization
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