Synthesize and Application of the Fe3O4/MW-CNT Composite in the Photo-Catalyst Assisted Electrochemical Oxidation of BTX Compounds From Wastewater

The Fe3O4/MW-CNT composite was prepared for a hybrid photo-catalyst-assisted electrochemical process for the removal of BTX contaminants from wastewater. The oxidation of multi-walled carbon nanotube was conducted by different treatments including the acid treatment and hydrogen peroxide. The XRD, FTIR, SEM, TEM, and BET analyses were performed to characterize both the MW-CNT and the synthesized composite. Simultaneous photo-catalyst and electrochemical processes were conducted to evaluate the performance of a new hybrid process for wastewater treatment. The effect of the current density, photo-catalyst loading, and BTX initial concentration was investigated experimentally. The characterization results of the synthesized composite show that a mixture of strong nitric acid and sulfuric acid treatment at a high exposure time and low temperature is the best route for the oxidation of MW-CNT. The removal efficiency of BTX compounds from wastewater using the hybrid photoelectrochemical process was found to be in the range of 28 to 43% under different conditions. The optimum condition for the maximum removal of BTX was found by the mathematical modeling of experimental data. The results indicate that a combination of photo-catalyst and the electrochemical process can enhance the BTX removal efficiency.