Catalytic ozonation of aqueous phenol over metal-loaded HZSM-5

摘要

The performances of HZSM-5 and transition metal-loaded HZSM-5 (Mn, Cu, Fe, Ti) catalysts duringncatalytic ozonation of phenol have been investigated. It was observed the performance order fornremoval of phenol and COD was Mn/HZSM-54Fe/HZSM-54Cu/HZSM-54Ti/HZSM-54HZSM-5.nThe presence of metals on HZSM-5 enhanced the phenol removal capability of HZSM-5. Mnnloading on HZSM-5 was optimized due to its high phenol removal capability amongst metal-loadednHZSM-5 catalysts. Experimental results suggested that low amount of Mn loading on HZSM-5 wasnsufficient for HZSM-5 to act as catalyst and adsorbent. A maximum of 95.8 wt% phenols andn70.2 wt% COD were removed over 2 wt% Mn/HZSM-5 in 120 min. It was supposed that transitionnmetals mainly acted as ozone decomposers due to their multiple oxidation states that enhancednthe ozonation of phenol.