Abstract
The photooxidation of a chlorotriazine reactive azo dye Reactive Orange 4 has been carried out in the presence of H 2O 2 using UV-A light. The effects of reaction pH, applied H 2O 2 dose, UV light power have been studied. These parameters strongly influence the decolourisation and degradation. The increase of initial dye concentration decreases the removal rate. The kinetics of decolourisation and degradation follow pseudo-first order. The solar–H 2O 2 process is also able to oxidise the dye and its efficiency is comparable with UV–H 2O 2. The influence of dye assisting chemicals such as NaOH, NaCl and Na 2CO 3 on photodecolourisation has been investigated. Addition of these chemicals inhibit the removal rate. The optimum operating conditions of the method are reported.
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