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The degradation of Reactive Red 120 dye (RR-120) in synthetic waters was studied. Two processes were considered: homogeneous sono-Fen­ton with iron(II) sulfate and heterogeneous sono-Fenton with synthetic goethite and goethite deposited onto silica and calcite sand (modified catalysts GS and GC, respectively). In 60 min of reaction, the homogeneous sono-Fenton pro­cess allowed a degra­dation of 98.10 %, in contrast with 96.07 % for the heterogeneous sono-Fenton process with goethite at pH 3.0. The removal of RR-120 increased when the modified catalysts were used instead of bare goe­thite. Chemical oxygen demand ( COD ) and total organic carbon ( TOC ) mea­surements showed that the highest TOC and COD removals were achieved with the homogeneous sono-Fenton process. Biochemical oxygen demand ( BOD 5) measurements allowed confirmed that the highest value of BOD 5/ COD was achieved with a heterogeneous sono-Fenton process (0.88±0.04 with the modi­fied catalyst GC), demonstrating that the biodegradability of the residual org­anic compounds was remarkably improved.

Degradation of Reactive Red 120 dye by a heterogeneous Sono-Fenton process with goethite deposited onto silica and calcite sand