Research Article

Surface complexation modeling of soluble molybdenum adsorption by Mn3O4

  1. Zhongwei Zhao1,2,*,
  2. Jing Liu1,
  3. Wentang Xia1,
  4. Caifang Cao1,
  5. Xingyu Chen1,
  6. Honggui Li1

Article first published online: 23 OCT 2009

DOI: 10.1002/jctb.2275

Issue

Journal of Chemical Technology and Biotechnology

Journal of Chemical Technology and Biotechnology

Volume 85, Issue 1, pages 121–126, January 2010

Additional Information

How to Cite

Zhao, Z., Liu, J., Xia, W., Cao, C., Chen, X. and Li, H. (2010), Surface complexation modeling of soluble molybdenum adsorption by Mn3O4. J. Chem. Technol. Biotechnol., 85: 121–126. doi: 10.1002/jctb.2275

Author Information

  1. 1

    School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

  2. 2

    Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals, Changsha 410083, China

*School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China.

Publication History

  1. Issue published online: 1 DEC 2009
  2. Article first published online: 23 OCT 2009
  3. Manuscript Accepted: 2 SEP 2009
  4. Manuscript Revised: 19 AUG 2009
  5. Manuscript Received: 6 JUL 2009

Funded by

  • National High-tech R&D Programs of China. Grant Numbers: 2006AA06Z122, 2007AA06Z129

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Keywords:

  • Mn3O4;
  • molybdenum removal;
  • MnSO4 solution;
  • Mo species distribution;
  • adsorption isotherm;
  • surface complexation model

Abstract

BACKGROUND: Mo is a harmful element that should strictly be limited in electrolytic manganese dioxide but can readily be removed by Mn3O4. However, as its adsorption mechanism is not yet clear the aims of this work are to clarify the absorption phenomena and specific reaction processes of Mo onto Mn3O4.

RESULTS: Some theoretical parameters have been obtained: the total surface site density and protonation constants (NT = 6.84 × 10−3 mol g−1, equation image, equation image) were obtained by non-linear data fitting of acid-base titrations. Distribution of soluble Mo species derived from thermodynamic calculations showed that the concentration of poly-molybdenum acid ion was extraordinarily low and could be ignored when the concentration of soluble Mo was 1 mg L−1. The adsorption isotherm followed the Freundlich adsorption equation. Under the conditions V = 0.15 L, W = 2 g L−1, [Mo]T = 1.12 mg L−1, T = 80 °C, P = 1.013 × 105 Pa, 1.0 mol L−1 MnSO4 and pH range 1–6.5, the non-electrostatic model (NEM) was used to quantify Mo adsorption.

CONCLUSION: The surface adsorption complexation modeling of Mo onto Mn3O4 can be successfully applied to predict adsorption rates of Mo onto Mn3O4 at different pH values, with an absolute error less than 6%. Copyright © 2009 Society of Chemical Industry

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