Mineralization of Substituted Aromatic Compounds by Ozonation Catalyzed by Cerium Oxide and a Cerium Oxide-activated Carbon Composite

Abstract

Cerium oxide (Ce-O) and a novel cerium oxide-activated carbon composite (AC 0 -Ce-O) were tested in the ozonation of three selected aromatic compounds: benzenesulfonic acid, sulfanilic acid and aniline. The catalysts performance was compared to that obtained with the commercial activated carbon. All the tested materials enhanced the mineralization of the selected compounds. Generally, best results were achieved with the AC 0 -Ce-O composite.

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

“…Nowadays, different treatment processes are used for the removal and/or recovery of phenols such as hot gas or steam-stripping [ 3 ], adsorption [ 4 ], ion exchange [ 5 ], plasma oxidation [ 6 ], electrochemical [ 7 ], photo-catalysis [ 8 ] and biological treatment processes [ 9 ]. Among the different phenol decontamination techniques, the adsorption method represents the most appropriate technique for the removal of aromatic pollutants from contaminated wastewater compared with traditional utilized techniques such as electrochemical oxidation [ 10 ], coagulation, flocculation [ 11 ], photochemical destruction [ 12 ] and membrane filtration [ 13 , 14 ]. The adsorption capabilities of many nanomaterials and their composites such as nano-zeolites [ 15 , 16 , 17 , 18 ], nano-ion exchange materials [ 19 , 20 , 21 ] and nano-metal oxides [ 22 ] have been investigated extensively.…”

Efficient degradation of fulvic acids in water by catalytic ozonation with CeO2/AC

“…No leaching of cerium was found in the catalytic ozonation process, which is vital for its commercial application for wastewater treatment. Moreover, ceria‐activated carbon composite was more efficient than corresponding activated carbon or ceria in ozonation of carboxylic acids, substituted aromatic compounds, dyes and textile effluents . Recently, highly dispersed ceria on activated carbon (AC) catalysts presented better performance than a ceria–carbon composite with a similar composition, which may be mainly attributable to its larger metal oxide surface area .…”

Kinetics and Mechanism of Humic Acids Degradation by Ozone in the Presence of CeO2/AC

“…Both activated carbon (AC) and ceria could accelerate ozone transformation into secondary radicals that would further react in the liquid phase (Orge et al 2011b;Orge et al 2012;Valdés and Zaror 2006b). Similar • OH radicals oxidation mechanism in the presence of CeO 2 /AC was also reported in the catalytic ozonation of carboxylic acids, substituted aromatic compounds, dyes and textile effluents (Faria et al 2008(Faria et al , 2009a(Faria et al , 2009bOrge et al 2011a). However, the ozonation kinetics and mechanism, molecular ozone and hydroxyl radical contributions of HA removal by catalytic ozonation have been rarely reported.…”