DEGRADATION OF REACTIVE RED 120 AZO DYE IN AQUEOUS SOLUTIONS USING HOMOGENEOUS/HETEROGENEOUS IRON SYSTEMS
Advanced oxidation processes (AOPs) are the most attractive methods to degrade different organic pollutants. The AOPs have grown extensively because water quality control and regulations have become very strict in many countries. In this study, the dye reactive red 120 (RR-120) was considered for degradation using homogenous (Fenton and Photo Fenton) and heterogeneous (suspension of nanoparticles -NPs- of iron oxyhydroxides and NPs of iron oxyhydroxides supported on a mesoporous material SBA-15) process. The discoloration kinetic study of reactive red 120 solutions with a 100 mg/L concentration and pH ∼3 was carried out, with hydrogen peroxide (H2O2) as oxidant agent and different iron salts types (FeCl2, FeCl3, FeSO4 and Fe2(SO4)3). The determined discoloration rate constants were higher for the homogeneous than those for heterogeneous catalytic processes. The RR-120 oxidation degree was measured by chemical oxygen demand (COD) with 90 percentages by the photoFenton process.
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