J. Phys. IV France
Volume 124, Mai 2005
Page(s) 81 - 89

J. Phys. IV France 124 (2005) 81-89

DOI: 10.1051/jp4:2005124013

Degradation of phenol, into mineral compounds, in aqueous solutions using Zero-Valent Iron Powder (ZVIP)

J. Rima1, E. Aoun2, K. Hanna3 and Q.X. Li4

1  Laboratory of Molecular Chemistry, Faculty of Science II, the Lebanese University, Fanar PO Box 2611, 0217 Fanar-Matn, Liban
2  Lebanese Agricultural Research Institute (LARI), Fanar PO Box 90, 1965 Jdeidet El-Metn, Liban
3  Laboratoire d'Analyse Environnemental des Procédés et des Systèmes Industriels, INSA de Lyon, 20 avenue Albert Einstein, 69621 Villeurbanne Cedex, France
4  Department of Molecular Biosciences and Bioengineering, University of Hawaii, USA

This paper presents an original approach to the treatment of phenolic aqueous solution by using zero-valent iron powder (ZVIP). In batch reactors under water treatment conditions (room temperature and pH: 4 - 7), a rapid degradation of phenol in the presence of iron powder 40 - 60 mesh (40 g L $^{\! \mbox{-} 1})$ was observed. The decline in the phenol concentration was monitored by a spectrofluorometer (Shimadzu RF 5301 PC), a spectrophotometer (UV-Vis Shimadzu 1650 PC) and GC (Gas Chromatography). Due to the degradation reaction, a large decrease in the total organic carbon (TOC) value, which was measured by a Shimadzu TOC analyzer model 5000 A, had been observed. The degradation enthalpy was measured by a micro-calorimeter SETARAM C80 and was compared to the formation enthalpy of phenol. In addition, experiments were run in buffer solutions. With different pH values, different degradation rates were obtained indicating that the pH plays an important role in the degradation process. Moreover, a kinetic study was performed and a potential mechanism of the degradation process is proposed.

Key words: Treatment, Phenol, Iron, Mineralization.

© EDP Sciences 2005