Er3+-doped ZnO/ZnAl2O4 multi-phase oxides acting as near-infrared active photocatalyst

Qin, Zhuozhuo; Liu, Wenxia; Li, Zhenzhen; Chen, Huabin; Li, Guodong; Yu, Deng‐Guang

doi:10.1007/s10854-018-8838-1

Cited by 14 publications

(6 citation statements)

References 40 publications

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“…Many strategies have been developed for fabricating NIR-active photocatalysts involving combination with upconversion materials [23], sensitization with NIR-responsive dyes [24], manipulation of defect bands, vacancies, and other photosensitive sites in semiconductors [17,25,26], and the incorporation of narrow-band-gap semiconductors [26]. However, HLC-based photocatalysts with near-infrared (NIR) activity have rarely been reported [27][28][29]. Of the few reported NIR light active photocatalysts derived from HLC calcination, Er 3+ -doped ZnO/ZnAl 2 O 4 multiphase oxide (MPO) was prepared by the calcination of Zn/Al/Er-HLC and acquired its the NIR light activity from the doping of Er 3+ as an upconversion species in ZnO/ZnAl 2 O 4 MPO [27].…”

Section: Introductionmentioning

confidence: 99%

“…However, HLC-based photocatalysts with near-infrared (NIR) activity have rarely been reported [27][28][29]. Of the few reported NIR light active photocatalysts derived from HLC calcination, Er 3+ -doped ZnO/ZnAl 2 O 4 multiphase oxide (MPO) was prepared by the calcination of Zn/Al/Er-HLC and acquired its the NIR light activity from the doping of Er 3+ as an upconversion species in ZnO/ZnAl 2 O 4 MPO [27]. Er 3+ -doped ZnO-CuO-ZnAl 2 O 4 -MPO was produced through calcination of Zn/Cu/Al/Er-HLC.…”

Section: Introductionmentioning

confidence: 99%

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Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Chen

Liu

2018

Catalysts

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Deriving photocatalysts by the calcination of hydrotalcite-like compounds has attracted growing interest for extending their photocatalytic activity to the visible and even near-infrared (NIR) light regions. Herein, we describe the acquisition of a ZnO/CuO/ZnFe2O4 nanocomposite with good photoFenton-like catalytic activity under UV, visible and near-infrared (NIR) light irradiation by optimizing the calcination temperature of the coprecipitation product of Zn2+, Cu2+ and Fe3+. The ZnO/CuO/ZnFe2O4 nanocomposite is composed of symbiotic crystals of ZnO, CuO and ZnFe2O4, which enable the nanocomposite to show absorption in the UV, visible and NIR light regions and to produce a transient photocurrent in the presence of H2O2 under NIR irradiation. The full-spectrum photoFenton-like catalyst shows improved performance for the degradation of methyl orange with an increasing amount of H2O2 and is very stable in the recycling process. We believe that the ZnO/CuO/ZnFe2O4 nanocomposite is a promising full-spectrum photoFenton-like catalyst for the degradation of organic pollutants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Chen

Liu

2018

Catalysts

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“…For instance, Zhu et al prepared Ag-ZnAl 2 O 4 nanorods photocatalyst by hydrothermal method, Because the rod-like structure with porous and has a high specific surface area, found that the photocatalytic activity of ag-supported ZnAl 2 O 4 to gas-phase toluene was higher than that of other prepared samples and commercial P25 [27]. Qin et al reported Er 3+ doped ZnO-ZnAl 2 O 4 polyphase oxide prepared by coprecipitation method, compared with undoped ZnO-ZnAl 2 O 4 , the ultraviolet catalytic degradation activity of methyl orange was enhanced [28]. Wu, etc synthesized spinel structure Zn 1−x Ni x Al 2 O 4 nanocrystalline by sol-gel method, found the band gap decreases of the samples with the increase of Ni concentration due to the introduction of impurity level between the conduction band and valence band, and occurs sparked the photoluminescence quenching phenomenon [29].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of Cr doped ZnAl₂O₄ nanoparticles with Spinel structure synthesized by hydrothermal method

Huang

Wei

et al. 2020

Mater. Res. Express

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Zn 1−x Cr x Al 2 O 4 (x=0, 0.01, 0.03, 0.05 and 0.07) nanoparticles were synthesized by hydrothermal method and heat treatment technology, and the effects of Chromium doping ratios on the microstructure, morphology, element distribution, binding energy and optical property of the samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), highresolution transmission electron microscopy (HRTEM), x-ray energy dispersive spectroscopy (XEDS), x-ray photoemission spectroscopy (XPS), ultraviolet-visible (UV-vis) spectroscopy, photoluminescence spectra (PL) and fourier transform infrared spectroscopy (FT-IR). The experimental results show that Zn 1−x Cr x Al 2 O 4 nanoparticles possess cubic spinel structure without other impurity phases. The average crystallite size decrease and the lattice parameter increase with the increase of Cr doping concentration. The morphology of the samples exhibits irregular spherical or ellipsoid particles with uniform particle size. XEDS spectra display Cr 3+ successfully used as doping agent replaced Zn 2+ and entered ZnAl 2 O 4 matrix. XPS spectra demonstrate that the doped Cr ions mainly occupy the tetrahedral sites in Zn 0.95 Cr 0.05 Al 2 O 4 sample. UV-vis spectra indicate the band gap of the doped sample decrease and exhibit red shift with the increase of Cr ion concentration. The intensity of FT-IR spectra for Zn 1−x Cr x Al 2 O 4 samples decreases slowly and occurs red shift. PL spectra show the intensity decrease and occur luminescence quenching phenomenon for Cr doped sample.

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“…Therefore, various modification methods have been adopted to overcome the above problems, such as adjusting the facet exposure, ion doping, noble metal loading and heterostructure construction. [26][27][28][29] The crystal structure and band structure of a spinel structure metal oxide can be adjusted by doping with a transition metal ion, which can extend the visible light response region, inhibit the recombination of photoinduced electron-hole pairs, enhance the photocatalytic activity, increase the separation rate of photoinduced carriers and improve photocatalytic activity. 30,31 In addition, transition metal ion-doped ZnAl 2 O 4 exhibits roomtemperature ferromagnetism, which can be effectively separated and recovered by an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Magnetically Recoverable Cr and Mn Co-Doped Zn0.95−xCr0.05MnxAl2O4 Nanoparticles for Dye Degradation Under Simulated Sunlight Irradiation

Wei

Huang

et al. 2020

Journal of Elec Materi

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Magnetically recyclable Zn 0.95Àx Cr 0.05 Mn x Al 2 O 4 nanoparticles were synthesized via hydrothermal and heat treatment techniques. The crystal structure, morphology, and photoelectrochemical and magnetic properties of the samples were characterized by x-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), x-ray energy-dispersive spectroscopy (XEDS), ultraviolet-visible (UV-Vis) spectroscopy, photoluminescence spectra (PL), vibrating-sample magnetometer (VSM), electrochemical impedance spectra (EIS) and transient photocurrent responses, and the photocatalytic activity of the samples were evaluated by the photodegradation of methyl orange (MO) dye under simulated sunlight irradiation. The experimental results show that Zn 0.95Àx Cr 0.05 Mn x Al 2 O 4 nanoparticles possess a cubic spinel structure without impurity phases. Cr and Mn ions are successfully substituted in the lattice site of Zn 2+ and enter the ZnAl 2 O 4 matrix. The morphology of the samples exhibits irregular spherical or ellipsoid particles with small particle size and good dispersion. The average crystallite size and the bandgap decrease with an increase in Mn ion concentration. Meanwhile, the co-doped samples exhibit obvious room-temperature ferromagnetism, the photoluminescence intensity decreases and a luminescence quenching phenomenon occurs. In addition, Zn 0.95Àx Cr 0.05 Mn x Al 2 O 4 nanoparticles exhibit excellent photocatalytic activity and possess better photocatalytic reusability in degradation of MO aqueous solution.

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Er3+-doped ZnO/ZnAl2O4 multi-phase oxides acting as near-infrared active photocatalyst

Cited by 14 publications

References 40 publications

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Optical properties of Cr doped ZnAl₂O₄ nanoparticles with Spinel structure synthesized by hydrothermal method

Magnetically Recoverable Cr and Mn Co-Doped Zn0.95−xCr0.05MnxAl2O4 Nanoparticles for Dye Degradation Under Simulated Sunlight Irradiation

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Er3+-doped ZnO/ZnAl2O4 multi-phase oxides acting as near-infrared active photocatalyst

Cited by 14 publications

References 40 publications

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Full-Spectrum Photocatalytic Activity of ZnO/CuO/ZnFe2O4 Nanocomposite as a PhotoFenton-Like Catalyst

Optical properties of Cr doped ZnAl2O4 nanoparticles with Spinel structure synthesized by hydrothermal method

Magnetically Recoverable Cr and Mn Co-Doped Zn0.95−xCr0.05MnxAl2O4 Nanoparticles for Dye Degradation Under Simulated Sunlight Irradiation

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Optical properties of Cr doped ZnAl₂O₄ nanoparticles with Spinel structure synthesized by hydrothermal method