Catalytic Ozonation of Selected Pharmaceuticals over Mesoporous Alumina-Supported Manganese Oxide

Abstract

Catalytic ozonation of five pharmaceutical compounds (PhACs)sphenazone, ibuprofen, diphenhydramine, phenytoin, and diclofenac sodium in alumina-supported manganese oxide (MnO x ) suspension was carried out with a semicontinuous laboratory reactor. MnO x supported by mesoporous alumina (MnO x /MA) was highly effective in mineralizing the PhACs in aqueous solution. Fourier transform infrared (FTIR) spectroscopy and in situ attenuated total reflection FTIR (ATR-FTIR) spectroscopy were used to examine the interaction of ozone with different catalysts under various conditions. The crucial active sites, surface oxide species at 1380 cm -1 , were formed by the interaction of ozone with Lewis acid sites on the alumina surface. New surface hydroxyl groups at 2915 and 2845 cm -1 were produced by the interaction of the catalyst and ozone in aqueous suspension and became active sites in the presence of MnO x . The introduction of MnO x enhanced the formation and activation of surface hydroxyl groups, causing higher catalytic reactivity. On the basis of these findings, a reaction mechanism is proposed for the catalytic ozonation of PhACs in MnO x / MA suspension.

Enhanced inhibition of bromate formation in catalytic ozonation of organic pollutants over Fe–Al LDH/Al2O3

“…Recently, there are increasing interests on catalytic ozonation with various catalysts to improve the oxidation efficiency of ozonation [11][12][13]. Our and other studies have verified that more reactive oxygen species were generated from the interaction of ozone and surface Lewis acid sites of catalysts [14][15][16].…”

Pharmaceutical removal from water with iron- or manganese-based technologies: A review

“…Alumina-supported manganese oxide suspension is used as catalyst in ozonation to remove phenazone, ibuprofen, diphenhydramine, phenytoin, and diclofenac. Results show that more than 90% TOC of pharmaceuticals mixture is removed with alumina-supported manganese oxide, whereas only 20% is removed without a catalyst (Yang et al, 2009). Carbon nanotube-supported manganese oxides are used to assist ozone to remove ciprofloxacin.…”

Facile Preparation of ZnO Nanocatalysts for Ozonation of Phenol and Effects of Calcination Temperatures

“…On the other hand, nanomaterials could be synthesized with controllable sizes and morphologies so that the catalytic activity could be tuned. In our previous study, Co 3 O 4 nanoparticles, 5 α-FeOOH nanorods 6 and β-MnO 2 nanowires 7 were synthesized successfully, all of which showed better catalytic performances in the process of the ozonation degradation of phenol. At the same time, the surface properties have been proposed to be one of the major factors responsible for the catalytic activity of nanostructures.…”

“…2, 3 The applications of catalytic ozonation to remove typical phenolic solutions demonstrated its promising prospect in water treatment. For example, commercial N-150 (Fe-Mn-O) catalyst revealed higher effect for biodegradability of a simulated phenolic wastewater.…”