African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 357

Full Length Research Paper

Stabilization of manganese (Mn)-induced peroxide decomposition

M. Wekesa1*, A. Habtewold2 and J. Mirdaniali2
1Coppin State University, 2500 W North Ave., Baltimore, MD 21216, USA. 2Edward Waters College, 1658 Kings Road, Jacksonville, FL 32209, USA.
Email: [email protected]

  •  Accepted: 14 April 2011
  •  Published: 31 July 2011

Abstract

Various ways were explored to reduce Mn-induced peroxide decomposition under conditions similar to industrial bleaching of mechanical pulps. It was found that hydrogen peroxide is more stable if Mn (II) or (III) are stabilized prior to peroxide addition. Sodium silicate/magnesium sulfate solution stabilized hydrogen peroxide in the presence of both Mn(II) and Mn(III), while diethylenetriamine pentaacetic acid (DTPA) effectively stabilized alkaline peroxide in the presence of Mn(II), but not Mn(III).Magnesium hydroxide/sodium silicate solution was not effective in stabilizing both Mn (II) and (III); however, microwave assisted sodium silicate-Mn complex modification resulted in complete peroxide stabilization of both Mn (II) and (III).

 

Key words: Manganese, peroxide decomposition, bleaching, stabilizers, chelant.