High-efficient treatment of phenol-containing wastewater with iron-loaded fine coal gasification slag activated carbon

Abstract

Iron-loaded coal gasification fine residue activated carbon (Fe/MAC) catalysts were prepared by the impregnation-calcination method using inexpensive coal gasification fine residue (CGF) as a carrier. The removal of simulated phenol from wastewater was experimentally investigated by activated carbon (Fe/MAC) catalysts with Fe-unloaded CGF activated carbon (MAC) as control. The catalysts were characterized by scanning electron microscopy (SEM), specific surface area and micropore analyzer (BET) and X-ray photoelectron spectroscopy (XPS). The effects of reaction times, reaction temperatures and catalyst dosages on phenol removal rate were systematically studied. The results showed that the iron was successfully loaded onto MAC by impregnation-calcination method, and the optimal conditions for phenol removal in the heterogeneous Fenton system based on Fe/MAC/H2O2 were 0.35 g of Fe/MAC catalyst dosage, 5 h of reaction time and 70 ℃. The results of this study provide a new idea for alleviating the secondary pollution of wastewater and catalyst separation of iron in the traditional Fenton method, expande the high-value application of coal gasification fine residue, and provide a new way for the efficient treatment of phenol wastewater.

Keywords

• coal gasification slag
• catalyst carrier
• phenol-containing wastewater
• activated carbon