A novel fe2o3-powder activated carbon/cao2 hybrid process for the effective removal of reactive blue 21 from simulated textile wastewater

In the present study the potential of using Magnetite-Powder Activated Carbon (M-AC) and Calcium Peroxide (CaO2) simultaneously as a novel adsorption/oxidation hybrid process was investigated for the removal of Reactive Blue 21 (RB21) from simulated textile wastewater containing production auxiliary chemicals. The characterization of the M-AC and the CaO2 was carried out by Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray (EDX), X-ray Diffraction (XRD) and Fourier Transmission Infrared (FTIR) and Specific Surface Area analyzes. RB21 removal studies were performed with M-AC, CaO2 and M-AC/CaO2 hybrid process separately. The effect of M-AC and CaO2 dosage on the removal of the RB21 was investigated. The data obtained from the adsorption of RB21 onto M-AC experiment fit well to Langmuir isotherm model with 0.984 R2 value. Langmuir isotherm predicted the maximum adsorption capacity of M-AC as 178.54 mg/g. The optimum pH for the oxidation of the RB21 by CaO2 was determined 10. The experiments showed that 0.6 g CaO2 is required for the removal of 100 mg/L RB21 over %99 efficiency. The oxidation of the RB21 by CaO2 was explained by second order kinetic model. Different amount of M-AC and CaO2 was used simultaneously in the hybrid process to determine the optimum condition for the RB21 removal. Efficient RB21 removal efficiencies were obtained by M-AC/CaO2 hybrid process. %24.4 and %55.7 RB21 removal efficiencies within 45 minutes were obtained by separately 0.04 g M-AC and 0.2 g CaO2, respectively. On the other hand, the RB21 removal efficiency within 45 minutes was calculated %99.44 by using 0.04 g M-AC and 0.2 g CaO2 simultaneously in hybrid process. The hybrid process also provided high Chemical Oxygen Demand (COD) removal efficiency (%92.4).