Photocatalytic purification of dye contaminated sea water by lanthanide (La 3+ , Ce 3+ , Eu 3+ ) modified ZnO

Kaneva, Nina; Bojinova, Assya; Papazova, K. I.; Dimitrov, Dimitre

doi:10.1016/j.cattod.2014.12.008

Cited by 59 publications

(20 citation statements)

References 29 publications

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“…Moreover, our data indicate a monotonous decrease in the band-gap of the Ce-modified samples with the lanthanide content, which is in good agreement with an increasing content of the Ce 0.68 Zn 0.32 O x mixed oxide phase. This behavior has been already observed for other modified ZnO systems, and has been tentatively attributed to the competition between Moss-Burstein and band renormalization effects [39]. Figure 11 displays the PL emission spectra of the pure and Ce-modified ZnO photocatalysts at different Ce contents.…”

Section: Optical Absorptionsupporting

confidence: 75%

In-Depth Structural and Optical Analysis of Ce-modified ZnO Nanopowders with Enhanced Photocatalytic Activity Prepared by Microwave-Assisted Hydrothermal Method

et al. 2020

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Pure and Ce-modified ZnO nanosheet-like polycrystalline samples were successfully synthesized by a simple and fast microwave-based process and tested as photocatalytic materials in environmental remediation processes. In an attempt to clarify the actual relationships between functionality and atomic scale structure, an in-depth characterization study of these materials using a battery of complementary techniques was performed. X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-Ray spectroscopy-scanning transmission electron microscopy (STEM-XEDS), photoluminescence spectroscopy (PL) and UV–Visible absorption spectroscopy were used to evaluate the effect of Ce ions on the structural, morphological, optical and photocatalytic properties of the prepared ZnO nanostructures. The XRD results showed that the obtained photocatalysts were composed of hexagonal, wurtzite type crystallites in the 34–44 nm size range. The SEM and TEM showed nanosheet-shaped crystallites, a significant fraction of them in contact with bundles of randomly oriented and much smaller nanoparticles of a mixed cerium–zinc phase with a composition close to Ce0.68Zn0.32Ox. Importantly, in clear contrast to the prevailing proposals regarding this type of materials, the STEM-XEDS characterization of the photocatalyst samples revealed that Ce did not incorporate into the ZnO crystal lattice as a dopant but that a heterojunction formed between the ZnO nanosheets and the Ce–Zn mixed oxide phase nanoparticles instead. These two relevant compositional features could in fact be established thanks to the particular morphology obtained by the use of the microwave-assisted hydrothermal synthesis. The optical study revealed that in the ZnO:Ce samples optical band gap was found to decrease to 3.17 eV in the samples with the highest Ce content. It was also found that the ZnO:Ce (2 at.%) sample exhibited the highest photocatalytic activity for the degradation of methylene blue (MB), when compared to both the pure ZnO and commercial TiO2-P25 under simulated sunlight irradiation. The kinetics of MB photodegradation in the presence of the different photocatalysts could be properly described using a Langmuir–Hinshelwood (LH) model, for which the ZnO:Ce (2 at.%) sample exhibited the highest value of effective kinetic constant.

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Section: Optical Absorptionsupporting

confidence: 75%

In-Depth Structural and Optical Analysis of Ce-modified ZnO Nanopowders with Enhanced Photocatalytic Activity Prepared by Microwave-Assisted Hydrothermal Method

et al. 2020

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“…The photooxidation removals of polyaromatic amines such as, 2-methoxy-5-methylaniline, 2.4-diaminoanisole, 4.40-diamino diphenyl ether, o-aminoazotoluene, 4-aminoazobenzol were 93%, 95%, 87%, 84% and 82%, respectively, after 60 min at pH=8.0 and at 25 o C ( Table 6) The color yields obtained in this study for TW are higher than the studies given below: [42] investigated the effects of Bi 0.95 Ni 0.05 O and Bi 0.90 Ni 0.10 O on the treatment of Methylene Blue (MB) dyestuff removal under 18 UV irradiation for 1 h. 81% color yields were observed for the aforementioned Ni-Bi-O nanocomposites, respectively [42]. [43] found 80% color yields based on Reactive Black 5 after 60 min irradiation time under 90 W irradiation using Bi-Ni nanocomposite.…”

Section: Effect Of Increasing Photooxidation Time On the Photooxidatimentioning

confidence: 68%

https://researchopenworld.com/treatment-f-organophenolic-and-organoaromatics-from-textile-wastewater-using-nico2o4-doped-bi2o2co3-nanocomposite/#

2020

Nanotechnol Adv Mater Sci

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“…Однако особенности структуры и свойств таких многослойных покрытий остаются малоизученными, а имеющиеся данные [9][10][11][12] противоречивы.…”

Section: Introductionunclassified

“…Авторами работ [9,10], получившими многослойные (1−7 слоев) покрытия из ZnO золь-гель методом отме-чено, что при увеличении количества наносимых слоев фотокаталитическая эффективность покрытия возраста-ет, что они связали с увеличением удельной площади его поверхности. Однако исследование морфологии и струк-туры таких покрытий показало [11,12], что при росте количества слоев увеличивается размер кристаллитов ZnO, и было предположено, что покрытие наоборот становится более плотным.…”

Section: Introductionunclassified

Оптические Свойства Многослойных Золь-Гель Пленок Оксида Цинка

Денисов¹,

Чубенко²,

Бондаренко³

et al. 2018

Физика И Техника Полупроводников

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Study of structural, optical and photocatalytic properties of multilayered (1–8 layers) zinc oxide films deposited on glass substrates by sol-gel method showed, that after thermal treatment at 500°C they consist of random oriented hexagonal crystalline grains with size of 34–40 nm, forming larger particles with sizes of 100–150 nm, which do not depend on number of layers. With an increase in the number of layers, the intensity of exciton photoluminescence decreases by a factor of 10, the absorption of light in the visible and near IR ranges increases, and the efficiency of photocatalytic decomposition of the test organic dye rhodamine B increases by 10–12%. The observed changes are related to the increase in the total area of grain boundaries and to the change in the integral amount of oxygen vacancies and interstitial atoms as the number of layers increases, which makes it possible to control the properties of zinc oxide films for applications in optoelectronics, photovoltaics and photocatalysis.

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Photocatalytic purification of dye contaminated sea water by lanthanide (La 3+ , Ce 3+ , Eu 3+ ) modified ZnO

Cited by 59 publications

References 29 publications

In-Depth Structural and Optical Analysis of Ce-modified ZnO Nanopowders with Enhanced Photocatalytic Activity Prepared by Microwave-Assisted Hydrothermal Method

In-Depth Structural and Optical Analysis of Ce-modified ZnO Nanopowders with Enhanced Photocatalytic Activity Prepared by Microwave-Assisted Hydrothermal Method

https://researchopenworld.com/treatment-f-organophenolic-and-organoaromatics-from-textile-wastewater-using-nico2o4-doped-bi2o2co3-nanocomposite/#

Оптические Свойства Многослойных Золь-Гель Пленок Оксида Цинка

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