TITLE:
Kinetic and Thermodynamic Study for Fenton-Like Oxidation of Amaranth Red Dye
AUTHORS:
Z. M. Abou-Gamra
KEYWORDS:
Amaranth Red, Decolorization, Kinetics, Fenton-Like
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.4 No.3,
July
4,
2014
ABSTRACT: Oxidation by Fenton like reactions
(Fe3+/H2O2) is economically process for destructive hazardous pollutants in
waste water. The effects of different parameters such as, amaranth red dye,
ferric chloride, hydrogen peroxide concentrations, pH value of solution,
temperature and the presence of inorganic ions (carbonate, nitrate, chloride)
on oxidative decolorization of amaranth were investigated. Amaranth degradation
by (Fe3+/H2O2) reagent was found to follow first order kinetic model. Under
optimum condition, pH = 2.6 and [FeCl3] = 3.75 × 10-4 mol·dm-3, the amaranth in
aqueous solution with an initial concentration of 5 × 10-5 mol·dm-3 was
degraded by 95% within 6 minutes. Increasing temperature in the range of 298 -
308 K increases the rate of dye degradation. Thermodynamic constants, ΔH*, ΔS* and ΔG* were evaluated. The results
implied that the oxidation process was favorable and endothermic.