Influence of aluminum oxides surface properties on catalyzed ozonation of 2,4,6-trichloroanisole

Catalytic ozonation for the removal of organic contaminants in water on alumina

“…For example, 19% of acetic acid was removed in the case of ozonation in the presence of alumina at pH 7.2 and only 6.4% and 16.2% were removed at pH 3.0 and 13 respectively. It was previously reported that catalytic activity of alumina increases with the increase in pH and is the highest near the point of zero charge of alumina [7][8][9], which supports our findings. Furthermore, in the current investigation, the adsorption process was also found to be pH dependent and was the highest at pH 7.2.…”

“…It has been reported that organic acids can adsorb on the surface of alumina, replacing surface hydroxyl groups [23]. The observed lack of catalytic activity at pH 3.0 could possibly be due to the exchange of surface hydroxyl groups of alumina by ligand exchange process with acetic acid [23], which are considered to be the active sites [7][8][9]. The current results do not conclusively indicate which could be the active sites of alumina.…”

“…1a). Previous reports indicate that alumina's activity increased near the point of zero charge of alumina [7][8][9]. The adsorption of ibuprofen on alumina is also an important factor, as ibuprofen has a high adsorption at pH 7.2 (Fig.…”

“…The surface hydroxyl groups on alumina were identified as active catalytic sites of ozone decomposition [7][8][9]. Qi et al [10] also confirmed that alumina promotes the generation of hydroxyl radicals but the group claimed that surface hydroxyl groups of ␥-alumina do not interact with aqueous ozone.…”

Efficient ozonation of reverse osmosis concentrates from petroleum refinery wastewater using composite metal oxide-loaded alumina

“…Industrial grade c-Al 2 O 3 particles have been used for enhanced ozonation of petrochemical effluents (Vittenet et al 2015). Ti/Al 2 O 3 (Bing et al 2017), Ru/Al 2 O 3 (Zhou et al 2007), and V/Al 2 O 3 (Qi et al 2009) are efficient catalysts for the treatment of recalcitrant organics such as dimethyl phthalate and 1, 2-dichlorobenzene. Mn/Al 2 O 3 is another powerful catalyst for removal of bio-recalcitrant organics.…”