1. Introduction
Hazardous colorful wastewater realized from industries particularly textile industry are one group of the major causes of environmental pollutions in water resources [1] and [2]. The release of synthetic dyes into the aqueous environment causes serious problems because of theirs strong color and low biodegradability [3] and [4]. The removal of these pollutants from contaminated aqueous solutions is of great importance in environmental processes [5]. Thus, there is currently considerable interest in developing effective processes for degradation of these types of organic pollutants.
Fenton process as of the advanced oxidation processes (AOPs) is regarded as a promising technology for wastewater treatment at room temperature and pressure, particularly for degradation of nonbiodegradable and toxic components to H2O and CO2[6] and [7]. It is based on production of various reactive species, often hydroxyl radical (radical dotOH). The radical dotOH is generated through the decomposition of H2O2 in the presence of Fe2+ as catalyst (Eq. (1)) [8]. The generated reactive species are able to degrade and mineralize various organic pollutants [9].