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Mesoporous MCM-41 and Fe loaded MCM-41(Fe/MCM-41),which were successfully prepared by a hydrothermal method and a dipping method respectively,were applied as heterogeneous catalysts for ozonation of p-chlorobenzoic acid(p-CBA) in aqueous solution.MCM-41 and Fe/MCM-41 were characterized by XRD,FT-IR and diffuse reflectance UV-vis(DR-UV-vis) techniques. The presence of either MCM-41 or Fe/MCM-41 improves p-CBA and total organic carbon(TOC) removal efficiency compared to ozonation alone.Under the experimental condition,TOC removal rate of Fe/MCM-41/O_3 process is over 63.5%at 60 min oxidation time,44.5%using MCM-41 as catalyst,only 37.7%with ozonation alone.The presence of tert-butanol(TBA) in the Fe/MCM-41/ O_3 process indicated that the oxidation mechanism of p-CBA occurs via OH in the liquid bulk.And Fe/MCM-41 is a promising catalyst.
Mesoporous MCM-41 and Fe loaded MCM-41 (Fe / MCM-41), which were successfully prepared by a hydrothermal method and a dipping method respectively, were applied as heterogeneous catalysts for ozonation of p-chlorobenzoic acid (p-CBA) in The presence of either MCM-41 or Fe / MCM-41 was characterized by XRD, FT-IR and diffuse reflectance UV-vis CBA and total organic carbon (TOC) removal efficiency compared to ozonation alone. Under the experimental condition, TOC removal rate of Fe / MCM-41 / O_3 process is over 63.5% at 60 min oxidation time, 44.5% using MCM-41 as catalyst only 37.7% with ozonation alone. The presence of tert-butanol (TBA) in the Fe / MCM-41 / O_3 process indicated that the oxidation mechanism of p-CBA occurred via OH in the liquid bulk. And Fe / MCM- 41 is a promising catalyst.