摘要
Ordered mesoporous carbon supported iron catalysts （Fe/OMC） were prepared by the incipient wetness impregnation method and investigated in Fenton-like degradation of 4-chlorophenol （4CP） in this work. XRD and TEM characterization showed that the iron oxides were well dispersed on the OMC support and grew bigger with the increasing calcination temperature. The catalyst prepared with a lower calcination temperature showed higher decomposition efficiency towards 4CP and H202, but more metals were leached. The effect of different operational parameters such as initial pH, H202 dosage, and reaction temperature on the catalytic activity was evaluated. The results showed that 96.1% of 4CP and 47.4% of TOC was removed after 270 min at 30℃, initial pH of 3 and 6.6 mmol/L H202.88% of 4CP removal efficiency was retained after three successive runs, indicating Fe/OMC a stable catalyst for Fenton reaction. 4CP was degraded predominately by the attack of hydroxyl radical formed on the catalyst surface and in the bulk solution due to iron leaching. Based on the degradation intermediates detected by high performance liquid chromatography, possible oxidation pathways were proposed during the 4CP degradation.
Ordered mesoporous carbon supported iron catalysts （Fe/OMC） were prepared by the incipient wetness impregnation method and investigated in Fenton-like degradation of 4-chlorophenol （4CP） in this work. XRD and TEM characterization showed that the iron oxides were well dispersed on the OMC support and grew bigger with the increasing calcination temperature. The catalyst prepared with a lower calcination temperature showed higher decomposition efficiency towards 4CP and H202, but more metals were leached. The effect of different operational parameters such as initial pH, H202 dosage, and reaction temperature on the catalytic activity was evaluated. The results showed that 96.1% of 4CP and 47.4% of TOC was removed after 270 min at 30℃, initial pH of 3 and 6.6 mmol/L H202.88% of 4CP removal efficiency was retained after three successive runs, indicating Fe/OMC a stable catalyst for Fenton reaction. 4CP was degraded predominately by the attack of hydroxyl radical formed on the catalyst surface and in the bulk solution due to iron leaching. Based on the degradation intermediates detected by high performance liquid chromatography, possible oxidation pathways were proposed during the 4CP degradation.
基金
financial supported by the National Natural Science Foundation of China(No.20607023,21177130)
the Major Science and Technology Program for Water Pollution Control and Treatment(No.2012ZX072020061)
