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

Faria, P.C.C.; Órfão, J.J.M.; Pereira, M.F.R.

doi:10.1007/s10562-008-9670-7

Cited by 21 publications

(4 citation statements)

References 18 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

et al. 2017

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Considering the great impact of a material’s surface area on adsorption processes, hollow nanotube magnetic zinc oxide with a favorable surface area of 78.39 m2/g was fabricated with the assistance of microwave technology in the presence of poly vinyl alcohol (PVA) as a stabilizing agent followed by sonic precipitation of magnetite nano-particles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs identified the nanotubes’ morphology in the synthesized material with an average aspect ratio of 3. X-ray diffraction (XRD) analysis verified the combination of magnetite material with the hexagonal wurtzite structure of ZnO in the prepared material. The immobilization of magnetite nanoparticles on to ZnO was confirmed using vibrating sample magnetometry (VSM). The sorption affinity of the synthesized magnetic ZnO nanotube for phenolic compounds from aqueous solutions was examined as a function of various processing factors. The degree of acidity of the phenolic solution has great influence on the phenol sorption process on to magnetic ZnO. The calculated value of ΔH0 designated the endothermic nature of the phenol uptake process on to the magnetic ZnO nanotubes. Mathematical modeling indicated a combination of physical and chemical adsorption mechanisms of phenolic compounds on to the fabricated magnetic ZnO nanotubes. The kinetic process correlated better with the second-order rate model compared to the first-order rate model. This result indicates the predominance of the chemical adsorption process of phenol on to magnetic ZnO nanotubes.

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Section: Introductionmentioning

confidence: 99%

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

et al. 2017

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“…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 .…”

Section: Introductionmentioning

confidence: 99%

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

Qin

Chen

Zhang

et al. 2013

J of Chemical Tech & Biotech

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BACKGROUND: Fulvic acids (FA), the main organic compounds in landfill leachate, are toxic and bio-resistant organic compounds. Ozonation is effective in removing non-biodegradable components and the addition of catalysts can improve the removal rates. The objective of this study is to prepare and improve CeO 2 /AC catalyst for catalytic ozonation of FA. RESULTS: The cerium precursor, calcination atmosphere and calcination temperature changed the percentage of Ce 3+ on the surface, thus affecting the catalytic performance of CeO 2 /AC catalyst. A linear relationship was established between the correcting apparent rate constant of FA degradation (k app /S BET ) and the percentage of Ce 3+ on the surface. The CeO 2 /AC with 5% of Ce loading and calcined under hydrogen atmosphere at 450 • C showed the highest catalytic activity, allowing a FA removal efficiency of 83%. The FA removal efficiency and ozone utilization efficiency were enhanced in O 3 /CeO 2 /AC compared with ozonation alone. CONCLUSION: Ce 3+ on the CeO 2 /AC surface is the active site for ozonation, indicating a feasible way to improve the catalytic performance of CeO 2 /AC. The O 3 /CeO 2 /AC process may be applied as a promising treatment method for landfill leachate.

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“…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.…”

Section: Introductionmentioning

confidence: 61%

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

Qin

Qi-wu

Chen

et al. 2015

Ozone: Science & Engineering

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This work investigated the catalytic ozonation of humic acids extracted from landfill leachate in the presence of CeO 2 /AC with focus on the kinetics of humic acids degradation. It was confirmed that the degradation of humic acids mainly took place in the solution bulk. The direct and indirect reaction constants of ozone against humic acids were determined. By analyzing the contributions of direct ozone oxidation and indirect • OH radicals oxidation to humic acids removal, it was found that • OH radicals oxidation predominated at all pH, indicating that the catalytic ozonation of humic acids with CeO 2 /AC involved • OH radicals mechanism.

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

Cited by 21 publications

References 18 publications

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

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

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

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

Cited by 21 publications

References 18 publications

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

Novel Magnetic Zinc Oxide Nanotubes for Phenol Adsorption: Mechanism Modeling

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

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

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Product

Resources

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

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