Mineralization of Humic Acid in Water by catalytic ozonation with Ce-MCM-41

Ce-MCM-41 was directly synthesized by a hydrothermal method and applied as a heterogeneous catalyst for ozonation of humic acid (HA) in aqueous solution. The influences of different factors on removal and mineralization of humic acid were investigated , such as catalyst dosage, cerium doped content , temperature and initial pH. The results showed that humic acid could be efficiently degraded in Ce-MCM-41/O3 system. Compared with ozonation alone, Ce-MCM-41can enhance the mineralization of HA. As the catalyst dosage was 100 mg/L, the catalyst have good activity for ozonation of HA and DOC removal was 70.58%(Si/Ce=80) after 60min reaction. The addition of three cerium doped content of the catalysts were good for mineralization of HA. And DOC removal and reduction of UV254 were increased with reaction temperature in the range of 288 K308 K. As the range of initial pH was6.08.5, DOC removal was slightly decreased with the increase of initial pH of HA solution. It showed that temperature and initial pH of HA solution had an impact on the removal of HA. Additionally, the effects of Ce-MCM-41 on bromate formation in bromide-containing water were also investigated, compared with ozonation alone, and adding 1.00g Ce-MCM-41 contribute to reducing 46.94% bromate. The results implied that the bromate formation was effectively inhibited with Ce-MCM-41.Ce-MCM-41 was benefited to improve the efficiency of ozonation of HA and reduction of bromate formation during ozonation of bromide-containing water.