Photocatalytic Oxidation of SO۲ from Flue Gas in the Presence of Mn/Copper Slag as a Novel Nanocatalyst: Optimizations by Box-Behnken Design

One of the principal air pollutants is sulfur dioxide (SO۲). The removal of SO۲ from flue gas has been one of the key challenges in the control of SO۲ emission. In this work, experimental scale photocatalytic oxidation of SO۲ is a major process leading to H۲SO۴ as a new method was suggested on the Liquid phase using Manganese supported on Copper Slag (Mn/CS) under UltraViolet (UV) irradiation. Mn/CS recognized as a novel nanocatalyst for photocatalytic oxidation of SO۲ from simulated flue gas.  In this study, a Column Packed Photo Catalytic Reactor (CPPCR) was applied. Firstly, the Mn/CS was perpetrated by the impregnation method. Analysis of X-Ray Diffraction (XRD), Field Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), FT-IR and X-Photoelectron Spectroscopy (XPS) were used for detection structure, morphology, and size of a particle of Mn/CS nanocatalyst and mechanism of manganese onto copper slag. FESEM results show a good agreement with those determined by the XPS. Box–Behnken Design (BBD) was used for optimization of variables, such as gas flow rate (L/min), Temperature (°C), Reaction time (min) and SO۲ concentration (mg/L). Removal of SO۲ under the optimal conditions, (۸.۱۴۱۴, ۲۵, ۶۰ and ۳.۹۴) for Gas flow rate, Temperature, Reaction time and SO۲ Concentration respectively were obtained. The most efficiency SO۲ removal achieved at the optimal operating conditions is around ۹۹%. It is concluded that the usage of this photocatalytic oxidation of SO۲ process, can significantly reduce SO۲ air pollution.

کلیدواژه ها:

Mn/Copper Slag ، Catalytic oxidation ، SO۲ oxidation ، Column packed photo catalytic reactor ، nanocatalyst