Enhanced photocatalytic activity of nanostructured Fe doped CeO2 for hydrogen production under visible light irradiation

Mansingh, Sriram; Padhi, Deepak Kumar; Parida, Kulamani

doi:10.1016/j.ijhydene.2016.05.191

Cited by 85 publications

(38 citation statements)

References 59 publications

(30 reference statements)

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“…The photo-reduction activity of the composite (CuO@ZM-41) is explained by Scheme 2. When the material was exposed to solar light (UV-Visible) irradiation, both CuO (p-type semiconductor with band gap 1.5-2.2 eV) and ZrO 2 (n-type semiconductor with band gap 4.0-7 eV) have the capability to absorb photons to produce photo-generated electrons (e À ) and holes (h + ) which are effectively transferred at the interface to reduce their recombination [47]. The conduction band (CB) and valence band (VB) potentials of CuO and ZrO 2 can be calculated by the Eq.…”

Section: Mechanismmentioning

confidence: 99%

Fabrication of mesoporous CuO/ZrO 2 -MCM-41 nanocomposites for photocatalytic reduction of Cr(VI)

Nanda

Pradhan

Parida

2017

Chemical Engineering Journal

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h i g h l i g h t sMesoporous ZrO 2 -MCM-41synthesized by in situ incorporation process. CuO@ZM-41 synthesized by modification of CuO onto the ZrO 2 -MCM-41. CuO@ZM-41nacomposite shows semiconductor behavior and mesoporosity. High surface area, lower e À and h + recombination are enhancing the photo-reduction. g r a p h i c a l a b s t r a c tMesoporous nanocomposite (CuO@ZM-41) is synthesized by incorporating mesoporous ZrO 2 (Z) into MCM-41 (M-41) framework followed by loading of CuO by wetness impregnation method. The synergism between CuO and the support material mesoporous ZM-41 and efficient light absorption on the surface of the composite is the key factor for the reduction Cr 6+ to Cr 3+ within 30 min time. a b s t r a c tMesoporous nanocomposites of CuO/ZrO 2 -MCM-41 (CuO@ZM-41) was designed by incorporating mesoporous ZrO 2 (Z) into the high surface area MCM-41 (M-41) framework followed by loading CuO by wetness impregnation method keeping Si/Zr ratio 10. The nanocomposites were studied under PXRD, N 2 sorption, DRS spectra, FTIR, XPS, NMR, HRTEM and PL to evaluate structural, morphological, optical properties and also the mesoporosity nature of the samples. The photo-reduction of Cr 6+ was performed over CuO@ZM-41 by varying pH, substrate concentration, and irradiation time and catalyst dose. Among all the catalysts, 2 CuO@ZM-41 was found to be efficient photocatalyst for the photo-reduction of Cr 6+ . Nearly 100% reduction of Cr 6+ has been achieved by 2 CuO@ZM-41 within 30 min. Intra-particle mesoporosity, high surface area, presence of CuO nanorods and electron transfer properties are the key factors for enhancing the photo-reduction activity of 2CuO@ZM-41.

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Section: Mechanismmentioning

confidence: 99%

Fabrication of mesoporous CuO/ZrO 2 -MCM-41 nanocomposites for photocatalytic reduction of Cr(VI)

Nanda

Pradhan

Parida

2017

Chemical Engineering Journal

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“…Such shallow traps greatly favour the catalytic reaction . In this regard, the structural properties of CeO 2 have been reported to be greatly influenced by Fe doping . However, doping too much Fe 3+ will result in severe crystal lattice deformation and generate excessive defects due to the far smaller ion radius of Fe 3+ than that of Ce 4+ .…”

Section: Introductionmentioning

confidence: 99%

“…7,8 Among the doping ions, Fe stands out due to its nontoxicity and low cost, as well as its atom size and electronic configuration of Fe 3+ . 8,9 The ion radius of Fe 3+ is 0.64 Å, far smaller than that of Ce 4+ (1.11 Å). Smaller Fe 3+ easily enters the crystal lattice of CeO 2 to replace Ce ions.…”

Section: Introductionmentioning

confidence: 99%

“…13 In this regard, the structural properties of CeO 2 have been reported to be greatly influenced by Fe doping. 8,9,[14][15][16] However, doping too much Fe 3+ will result in severe crystal lattice deformation and generate excessive defects due to the far smaller ion radius of Fe 3+ than that of Ce 4+ . The excessive defects contrarily become the recombination centres of photogenerated electrons and holes, and deteriorate the catalytic activity of CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Tuning the structural properties of CeO₂ by Pr and Fe codoping for enhanced visible‐light catalytic activity

Wen

Lou

Chen

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Iron (Fe)3+ has much a smaller ion radius than cerium (Ce)4+ but praseodymium (Pr) ions have a similar radius to Ce ions with the same valence. Hence, it is interesting to tune the structural properties, including lattice deformation, band gap and oxygen vacancy (Ov), of CeO2 by Pr and Fe codoping for enhanced visible‐light catalytic activity. RESULTS A series of Ce1‐x‐yPrxFeyO2‐σ (x = 0∼0.012, y = 0.003∼0.031) nanoparticles were prepared by a simple one‐step sol‐gel method. The structural properties of CeO2, including crystal deformation (cell lattice from 5.4069 to 5.4195), band gap (from 2.20 to 2.93), oxygen vacancies (Ov from 0.15% to 9.03%), and peroxide species (O22− from 0.37% to 1.09%) can be finely tuned by Pr and Fe codoping. Among ten samples, Ce0.982Pr0.003Fe0.015O2‐σ with proper structural properties showed the highest photocatalytic activity towards the degradation of acid orange 7. The first reaction rate constant reaches 0.0687 min−1, 9.3 and 7.7 times that of Ce0.994Pr0.006O2‐σ and Ce0.985Fe0.015O2‐σ, respectively. The mechanism was found to involve ·OH, ·O2− and photogenerated holes. CONCLUSION The structural properties of CeO2 can be finely and easily tuned by Pr and Fe codoping. Thus, the photocatalytic activity of CeO2 under visible light irradiation was boosted. © 2019 Society of Chemical Industry

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“…may create defects in the bandgap and thereby tune the bandgap [13][14][15][16]. Transition element doping in CeO2 is a good example, which has been proved to greatly increase its catalytic and biomedical properties owing to reduction in bandgap and oxygen vacancies related defects [2,17]. Ni doping in CeO2 reduces the bandgap from UV region to visible region [11].…”

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confidence: 99%

Oxygen and cerium defects mediated changes in structural, optical and photoluminescence properties of Ni substituted CeO2

Tiwari

Rathore

Patra

et al. 2019

Journal of Alloys and Compounds

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Enhanced photocatalytic activity of nanostructured Fe doped CeO2 for hydrogen production under visible light irradiation

Cited by 85 publications

References 59 publications

Fabrication of mesoporous CuO/ZrO 2 -MCM-41 nanocomposites for photocatalytic reduction of Cr(VI)

Fabrication of mesoporous CuO/ZrO 2 -MCM-41 nanocomposites for photocatalytic reduction of Cr(VI)

Tuning the structural properties of CeO₂ by Pr and Fe codoping for enhanced visible‐light catalytic activity

Oxygen and cerium defects mediated changes in structural, optical and photoluminescence properties of Ni substituted CeO2

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Enhanced photocatalytic activity of nanostructured Fe doped CeO2 for hydrogen production under visible light irradiation

Cited by 85 publications

References 59 publications

Fabrication of mesoporous CuO/ZrO 2 -MCM-41 nanocomposites for photocatalytic reduction of Cr(VI)

Fabrication of mesoporous CuO/ZrO 2 -MCM-41 nanocomposites for photocatalytic reduction of Cr(VI)

Tuning the structural properties of CeO2 by Pr and Fe codoping for enhanced visible‐light catalytic activity

Oxygen and cerium defects mediated changes in structural, optical and photoluminescence properties of Ni substituted CeO2

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Tuning the structural properties of CeO₂ by Pr and Fe codoping for enhanced visible‐light catalytic activity