Abstract

The discoloration and mineralisation of the azo-dye Orange II in a photoreactor using TiO2-coated glass rings as immobilised photocatalyst is reported. The variation of pH and the H2O 2 addition effect were systematically investigated. The use of the response surface methodology allowed to fit the optimal values of the parameters leading to Orange II abatement. Also, a single polynomial expression modelling the reaction was obtained. The photocatalytic degradation of Orange II was followed by spectrophotometric analysis and total organic carbon (TOC) measurements. © 2003 Elsevier B.V. All rights reserved.