CeO2/H2O2 system catalytic oxidation mechanism study via a kinetics investigation to the degradation of acid orange 7

Chen, Feng; Shen, Xingxing; Wang, Yongchuan; Zhang, Jinlong

doi:10.1016/j.apcatb.2012.04.014

Cited by 98 publications

(48 citation statements)

References 27 publications

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“…H 2 O 2 reduces Ce(IV) to Ce(III) at low pH, and reoxidize it to Ce(IV) at high pH with increasing amount of H 2 O 2 or with oxygen [33]. If the concentration of H 2 O 2 is below 100 mM, Ce(III) active sites are occupied by H 2 O 2 -like species forming stable complexes [41]. Sardesai et al [42] detected such complexes by reducing them after collision of the ceria nanoparticles (4 g/L) on a Pt microelectrode of 125 μm diameter.…”

Section: Chemical Characterizationmentioning

confidence: 99%

Physical and chemical characterization of cerium(IV) oxide nanoparticles

et al. 2016

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Chemical composition, size and structure of the nanoparticle are required to describe nanoceria. Nanoparticles of similar size and Ce(III) content might exhibit different chemical behaviour due to their differences in structure. A simple and direct procedure based on affordable techniques for all the laboratories is presented in this paper. The combination of Raman and UV-vis spectroscopy and particle impact coulometry (PIC) allows the characterization of nanoceria of small size from 4 to 65 nm at a concentration from micromolar to nanomolar, a concentration range suitable for the analysis of lab-prepared or commercial nanoparticle suspensions, but too high for most analytical purposes aimed at nanoparticle monitoring. While the PIC limits of size detection are too high to observe small nanoparticles unless catalytic amplification is used, the method provides a simple means to study aggregation of nanoparticles in the media they are needed to be dispersed for each application. Raman spectroscopy provided information about structure of the nanoparticle, and UV-vis about their chemical behaviour against some common reducing and oxidizing agents. Graphical Abstract To characterize nanoceria it is necessary to provide information about the shape, size and structure of the nanoparticles as well as the chemical composition.

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Section: Chemical Characterizationmentioning

confidence: 99%

Physical and chemical characterization of cerium(IV) oxide nanoparticles

et al. 2016

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“…As shown by Fallah et al, CeO 2 can be photoactivated by near UV-vis irradiation [5], implying that it is likely to be a promising photocatalyst. Recently, many researches have focused on the photocatalytic properties of ceria and ceria-based compounds [6][7][8]. It is well known that ceria, with a 3.2 eV bandgap, has a strong absorption in the region of UV light.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous CePrO solid solution with efficient photocatalytic activity under weak daylight irradiation

Hao

Hou

Aprea

et al. 2014

Applied Catalysis B: Environmental

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“…Later, the formation of HO· was confirmed in nanoceria/H 2 O 2 system 7 . On the other hand, Chen and co-workers 8–10 revealed that H 2 O 2 could react with cerium ions on the surface of nanoceria and form stable brown peroxide species, which would induce an intermolecular rearrangement with the adjacent adsorbed organic compounds to achieve the degradation of organics or generate HO∙ through a homolytic cleavage of the O–O bond to attack the neighboring adsorbed organics 5 . Now, it is recognized that the catalytic activity of nanoceria relies closely on the redox cycle between Ce 3+ and Ce 4+ , and a higher level of Ce 3+ and defects can generate more active oxidative species and exhibit better activity toward the oxidative degradation of organic compounds 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation reaction of organic compounds in nanoceria/H 2 O 2 system generally occurs on the ceria surface; therefore, the adsorption of organics plays an important role in their degradation 10,13 . Previous studies have shown that nanoceria exhibits high degradation activity for the adsorbable organic compounds such as orange II, methyl orange, salicylic acid 8,14 ; however, the degradation of weakly adsorbed organic compounds such as rhodamine B, rhodamine 6 G and catechol hardly occurs 6,8 .…”

Section: Introductionmentioning

confidence: 99%

Different adsorption-degradation behavior of methylene blue and Congo red in nanoceria/H2O2 system under alkaline conditions

Wei

Wang

Feng

et al. 2019

Sci Rep

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The Fenton-like activity of nanoceria has attracted intensive attention for wastewater treatment in recent years. During the Fenton-like reaction, the adsorption of organic pollutants on catalyst surface plays a key role in their degradation. In this work, the adsorption-degradation of methylene blue (MB) and Congo red (CR) in nanoceria/H2O2 system was investigated under alkaline conditions. The MB exhibited weak adsorption on nanoceria surface via electrostatic attraction, while strong Lewis acid–base interactions between CR and cerium ions was observed. Moreover, the adsorption of MB was enhanced in the presence of H2O2 by the formation of surface peroxide species, but an adsorption competition existed between H2O2 and CR. With more Ce3+, CeO2 nanorods could degrade CR efficiently as Fenton-like catalyst. But the degradation of MB catalyzed by ceria was much lower than that of CR in the presence of H2O2.

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CeO2/H2O2 system catalytic oxidation mechanism study via a kinetics investigation to the degradation of acid orange 7

Cited by 98 publications

References 27 publications

Physical and chemical characterization of cerium(IV) oxide nanoparticles

Physical and chemical characterization of cerium(IV) oxide nanoparticles

Mesoporous CePrO solid solution with efficient photocatalytic activity under weak daylight irradiation

Different adsorption-degradation behavior of methylene blue and Congo red in nanoceria/H2O2 system under alkaline conditions

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