DECOLORIZATION OF ORANGE II BY HETEROGENEOUS FENTON PROCESS USING GOETHITE AS CATALYST
Abstract
The effect of goethite addition, hydrogen peroxide concentration, initial pH, hydroxyl radical scavenger and initial dye
concentration on the decolorization of Orange II by Fenton-like process was investigated. The results showed that the
decolorization rate increased with goethite addition and hydrogen peroxide concentration, but decreased with the increase of
initial dye concentration. There existed an optimal initial pH to achieve the highest decolorization rate. The presence of
carbonate, a well known hydroxyl radical scavenger, would inhibit the decolorization reaction. The specific oxygen uptake rate
(SOUR) increased with the oxidation of Orange II, indicating the heterogeneous Fenton treatment enhanced the biodegradability
of the dye wastewater.