فهرست نشریات علمی دسترسی آزاد ایران

Carbamazepine is one of the hydrophilic compounds identified in aquatic environments. Due to toxicity and bio-stability of this psychotropic pharmaceutical in the environment and humans, its removal efficiency and mineralization are important. In this study, synthesized Fe@Fe 2 O 3 nanowires were applied to improve Fenton oxidation process using FeCl 3 .6H 2 O and NaBH 4 . The effects of different parameters such as initial pH, H 2 O 2 , FeSO 4 .7H 2 O, carbamazepine concentrations, oxidation time, and nanowires dose were evaluated using response surface methodology. After scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffract meter analysis, Fe@Fe 2 O 3 morphology was synthesized in the form of nanowires with diameters of about 40-80 nm. The optimum oxidation conditions for carbamazepine were established at pH= 4.3, reaction time of 45.9 min, nanowire dose of 179.4 mg/L as well as H 2 O 2 , FeSO 4 .7H 2 O and carbamazepine concentrations of 22, 52.2 and 7.7 mg/L, respectively. The oxidation efficiency (99.5%) achieved under the optimum condition, which was determined by the model, was consistent with the efficiency predicted by the model. The multi-parameter models showed good calibration and prediction abilities with R 2 = 0.922, R 2 adj = 0.907, R 2 pred = 0.868. According to the results, the carbamazepine degradation rate increased with the increase of Fe 2+ due to the synergistic effect between Fe@Fe 2 O 3 and Fe 2+ on the catalytic decomposition of H 2 O 2 and generation of OH•. It was concluded that the Fenton process based on the Fe@Fe 2 O 3 nanowires can increase the carbamazepine oxidation rate in aqueous solutions. This method can also be used as an effective and pre-treatment process in the conventional treatment plants.