Sonocatalytic fenton oxidation process using natural martite for treatment of color in water

Dindarsafa, Mahsa
This study aims to investigate the removal efficiency of an organic dye, Acid Blue 92 (AB92), using heterogeneous sono-Fenton-like process and compare it with its homogeneous counterpart. High energy planetary ball milling was applied to prepare sono-Fenton nanocatalyst from natural martite. The unmilled and ball milled samples were characterized by XRD, FT-IR, SEM, EDX and BET analyses. The catalytic performance of the 6h ball milled martite was the best for removal of AB92 in heterogeneous sono-Fenton-like process. The particle size distribution of the 6 h-milled martite was in the range of 10 nm to 90 nm, which had the highest surface area compared to the other samples. Then, the impact of main operational parameters such as initial pH, catalyst dosage and dye concentration on the AB92 degradation were investigated on both the heterogeneous and homogeneous sono-Fenton-like processes comparatively. The effect of ultrasonic power and different scavengers were just considered on heterogeneous sono-Fenton-like process. The degradation efficiency of AB92 in heterogeneous system was much higher than that of the homogeneous one. The treatment process followed pseudo-first order kinetic. Environmentally-friendly modification of the unmilled martite, low leached iron amount and repeated application at milder pH were the significant benefits of using 6 h ball milled martite in heterogeneous sono-Fenton-like process. Intermediates generated during removal were identified.