Improving the catalytic activity of CeO2/H2O2 system by sulfation pretreatment of CeO2

Wang, Yongchuan; Shen, Xingxing; Chen, Feng

doi:10.1016/j.molcata.2013.10.003

Cited by 81 publications

(23 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The weak band at 1172 cm À1 was attributed to second-order phonon mode of fluorite structure [10]. The peak around 593 cm À1 was known to be associated to the oxygen vacancies in CeO 2 lattice [19,30]. Fe doped into CeO 2 increased the lattice distortion of the CeO 2 crystallite, which was verified in above XRD and HRTEM analysis.…”

Section: Raman Analysissupporting

confidence: 52%

“…In contrast, FeCeO x /H 2 O 2 showed a very good diclofenac removal of 41.45% at 5 min and increased to 85.25% at 40 min. The results suggested that the active component in FeCeO x should be CeO 2 , which has been proven to decompose H 2 O 2 into active hydroxyl radicals in degradation of acid orange 7 in water [19]. Martins et al also doped Fe into CeO 2 by co-precipitation method to remove phenolic acids in Fenton-like process.…”

Section: Feasibility Studymentioning

confidence: 99%

See 1 more Smart Citation

Preparation of FeCeO by ultrasonic impregnation method for heterogeneous Fenton degradation of diclofenac

Shan

Zhang

et al. 2016

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

FeCeOx has been successfully synthesized by ultrasonic impregnation method and applied in diclofenac removal in heterogeneous Fenton process. The effects of ultrasonic density, impregnation time, mole ratio of Fe and Ce and calcination temperature were investigated. Nitrogen adsorption/desorption, SEM, XRD, HRTEM, Raman and XPS analyses were characterized. Stability and reusability of FeCeOx were evaluated. The results indicated that 83% degradation efficiency of diclofenac was achieved by FeCeOx under the optimum preparation conditions. Fe ions were distributed uniformly in crystal structure and the solid solution structure of FeCeOx with a lattice constriction was formed. Exposed crystalline plane (200) with a relatively high surface energy may be the main reason to provide high catalytic activity of FeCeOx. Oxygen vacancies took part in catalytic process and a portion of them were oxidized after reaction. FeCeOx showed an excellent chemical stability and reusability in heterogeneous Fenton process.

show abstract

Section: Raman Analysissupporting

confidence: 52%

Section: Feasibility Studymentioning

confidence: 99%

Preparation of FeCeO by ultrasonic impregnation method for heterogeneous Fenton degradation of diclofenac

Shan

Zhang

et al. 2016

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

show abstract

“…Under these conditions, the bulk OSC is supposed to be insignificant compared with the reactivity of surface sites . Only very recently, ceria was investigated for Fenton reactions using model dyestuff or real phenolic or landfill effluents …”

Section: Introductionmentioning

confidence: 99%

“… suggested that the reaction proceeds as in the classical Fe 2+ /H 2 O 2 system. Different authors also pointed out that some Ce x+ cations located at the CeO 2 surface react with H 2 O 2 to generate brown peroxide‐like intermediates, which partly transform into hydroxyl radicals via an intermolecular rearrangement, the latter reaction being promoted by UV light, acidic conditions and/or surface sulfation . In addition, some research work highlighted that nanosized ceria are desired in order to enhance the presence of Ce 3+ surface sites and the production of hydroxyl radicals, others have pointed out that the same sites could act as efficient scavengers for OH • species.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of ceria–zirconia catalysts for the catalytic wet peroxidative oxidation of azo dyes: reactivity and quantification of surface Ce(IV)‐peroxo species

Hamoud

Azambre

Finqueneisel

2015

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: Doping nanoceria with zirconia often leads to improved catalytic properties due to enhanced concentration of structural defects in the resulting materials. This study aims to identify the parameters and mechanisms governing the reactivity of well-characterized commercial ceria-zirconia (Ce x Zr 1-x O 2 ) nanocatalysts with various Ce contents (x = 1, 0.80, 0.50, 0.21, 0) or surface area towards the degradation of Orange II dye in the presence of H 2 O 2 . RESULTS: Discoloration and mineralization kinetics were found to be strongly related both to the composition and surface area of the single or mixed oxides. Under standard conditions (23 ∘ C, dark, stoichiometric concentration in H 2 O 2 ), the best discoloration and mineralization performances were achieved for pure ceria (100% of color removal in 2 h and 65% mineralization in 8 h), but this arises mainly from its higher specific area by comparison with Zr-doped materials.For the first time, the amount of Ce IV (O 2 ) 2− surface species, intermediates in the production of hydroxyl radicals and generated from the reaction of H 2 O 2 with Ce(III) sites, was quantitated using TPD-MS in order to provide a rational basis to explain the catalytic performance. CONCLUSION: Doping ceria with Zr increases the surface density of defective Ce(III) sites that can be converted to Ce IV (O 2 ) 2− species in the presence of H 2 O 2 , but other parameters, such as the specific surface area and surface Ce content of the catalysts, are also important. An in-depth mechanism for the reaction of H 2 O 2 on the ceria-zirconia surface is discussed based on the experimental results.

show abstract

“…The difficulties associated with recyclability and removal of the catalyst holds back its commercial application for waste water treatment. As an ambient catalytic reaction, a heterogeneous Fenton -like oxidation on pure and modified ceria nanoparticles was attempted by researchers due to its merits over homogeneous catalysis [13,14]. In depth investigations of ceria/H 2 O 2 Fenton-like system revealed that the production of hydroxyl radicals mainly depends on the nature of the oxide surface.…”

Section: Introductionmentioning

confidence: 99%

Modulated heterogeneous Fenton-like activity of ‘M’ doped nanoceria systems (M = Cu, Fe, Zr, Dy, La): Influence of reduction potential of doped cations

Divya

Renuka

2015

Journal of Molecular Catalysis A: Chemical

View full text Add to dashboard Cite

Improving the catalytic activity of CeO2/H2O2 system by sulfation pretreatment of CeO2

Cited by 81 publications

References 48 publications

Preparation of FeCeO by ultrasonic impregnation method for heterogeneous Fenton degradation of diclofenac

Preparation of FeCeO by ultrasonic impregnation method for heterogeneous Fenton degradation of diclofenac

Reactivity of ceria–zirconia catalysts for the catalytic wet peroxidative oxidation of azo dyes: reactivity and quantification of surface Ce(IV)‐peroxo species

Modulated heterogeneous Fenton-like activity of ‘M’ doped nanoceria systems (M = Cu, Fe, Zr, Dy, La): Influence of reduction potential of doped cations

Contact Info

Product

Resources

About