Application of response surface methodology to optimize degradation of TNT using nano Fe-0-assisted fenton process

摘要

This work aims to investigate the degradation of 2,4,6 trinitrotoluene (TNT) as a model typical nitro-aromatic compound. The degradation process was carried out by hydroxyl radical that was produced via hydrogen peroxide activated by nano zero-valent iron (Fe-0). The nanoparticles as a source of ferrous ions were synthesized by precipitation method using a starch coating as a stabilizer. The transmission electron microscope analysis revealed that the size of the Fe-0 particles is about 40 nm. The operating parameters were optimized using central composite design as a kind of response surface methodology. The degradation efficiency of 91% during 10 minutes and mineralization efficiency of 83% during 40 minutes were obtained under the experimental conditions of 30 mg/L TNT, 104.8 mg/L Fe-0, 675 mg/L H2O2, and pH of 3.5. Finally, redwater treatment as real nitro-aromatic wastewater was evaluated by this process, and 63% removal efficiency was attained after 40 minutes in the optimum condition. (c) 2018 American Institute of Chemical Engineers Environ Prog, 38: 477-482, 2019