• catalytic ozonation of p-chlorobenzoic acid in aqueous solution using fe-mcm-41 as catalyst

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 645
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     mcm-41and iron-substituted mcm-41 (fe-mcm-41) were synthesized successfully and characterized using x-ray diffraction (xrd), nitrogen adsorption–desorption and transmission electron microscopy (tem). the mesopores of the sample remained well ordering and of hexagonal structure. fe-mcm-41 samples possessed high bet surface areas, high pore volumes and narrowed pore size distribution. their catalytic activities were compared in terms of p-chlorobenzoic acid (p-cba) and toc removal. ozonation catalyzed by fe-mcm-41 exhibited extraordinarily high catalytic performance over other studied processes. 100% conversion of p-cba and 91.3% toc were achieved in 10 min and 60 min, respectively. fe-mcm-41 as a novel heterogeneous catalyst in ozonation process was addressed. the presence of tert-butanol (tba) inhibiting the degradation ofp-cba in the fe-mcm-41/o3 process verified that the hydroxyl radicals derived from ozone decomposition were responsible for the improvement of catalytic ozonation. the mechanism explaining the formation of hydroxyl radicals on fe-mcm-41 surface was proposed. negative centers or brönsted acid sites developed by the substitution of trivalent iron into the walls of mcm-41 and the hydroxyl groups formed as a result of coordinative unsaturation were found to be the active sites enhancing catalytic performance. the superior stability of iron ions in fe-mcm-41 catalyst during the ozonation process was also examined.

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