Enhanced Visible-Light Photocatalytic Activity of C/Ce-Codoped ZnO Nanoellipsoids Synthesized by Hydrothermal Method

Ha, Luu Thi Viet; Đại, Lưu Minh; Nhiệm, Đào Ngọc; Nguyen, Van Cuong

doi:10.1007/s11664-016-4570-x

Cited by 14 publications

(4 citation statements)

References 26 publications

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“…This change suggested partial oxidation of the surface graphene to graphene oxide (GO) during the preparation process. In addition, in our previous research, 26 with a sufficient percentage of dopants, C and Ce atoms were probably incorporated at the interstitial sites of the hexagonal ZnO lattice by the hydrothermal process at high temperature and pressure. After C and Ce atoms were doped, the C/Ce–ZnO material still had a single crystalline phase with a positive shift of diffraction peaks (Fig.…”

Section: Resultsmentioning

confidence: 83%

“…The obtained materials lowered the band gap and inhibited the recombination of electrons and holes, which possibly promoted the photocatalytic activity of objective materials. In our previous studies, Ce-doped ZnO 25 and C/Ce-co-doped ZnO 26 were prepared by a hydrothermal method to enhance the photocatalytic degradation of methylene blue (MB) under visible light irradiation. The Ce-doped ZnO and C/Ce-co-doped ZnO significantly increased the degradation efficiency of MB by 1.9 times and 3.6 times, respectively.…”

Section: Introductionmentioning

confidence: 99%

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One-pot hydrothermal preparation of capsule-like nanocomposites of C/Ce-co-doped ZnO supported on graphene to enhance photodegradation

Luu

Nguyen

et al. 2023

New J. Chem.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

One-pot hydrothermal preparation of capsule-like nanocomposites of C/Ce-co-doped ZnO supported on graphene to enhance photodegradation

Luu

Nguyen

et al. 2023

New J. Chem.

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“…The most popular assumption is that the inclusion of Ce in the lattice sites of ZnO can generate discrete energy levels between the VB and the CB: the presence of such localized electronic energy states is suggested by the strengthened visible photon absorption. In particular, the empty localized 4f orbitals of Ce 4+ below the conduction band edge would guarantee a narrow charge transfer between the 4f energy level and the conduction/valence bands of ZnO, with the consequent improved photodegradation activity [88,89,95,96,[111][112][113]. Within this description, the presence of cerium is also believed to reduce the electron-hole pair recombination, where the easy Ce 3+ /Ce 4+ conversion should be the key step, with Ce 4+ acting as an electron scavenger and Ce 3+ as an electron donor.…”

Section: Ce-doped Znomentioning

confidence: 99%

Cerium-, Europium- and Erbium-Modified ZnO and ZrO2 for Photocatalytic Water Treatment Applications: A Review

et al. 2021

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In the last decades photocatalysis has become one of the most employed technologies for the implementation of the so-called Advanced Oxidation Processes (AOPs) for the removal of harmful pollutants from wastewaters. The materials identified as the best photocatalysts are transition metal oxides, in which the band structure allows charge carrier separation upon solar irradiation. The photoinduced charge carrier can thus cause oxidative and reductive redox reactions at the surface, inducing the formation of the radical species able to initiate the AOPs. Despite the great advantages of this process (non-toxic, cheap and environmentally clean), the main drawback lies in the fact that the most efficient semiconductors are only able to absorb UV irradiation, which accounts for only 5% of the total solar irradiation at the Earth’s surface and not enough to generate the required amount of electron-hole pairs. On the other hand, many efforts have been devoted to the sensitization of wide band gap transition metal oxides to visible light, which represents a higher percentage (almost 45%) in the solar electromagnetic spectrum. Among all the strategies to sensitize transition metal oxides to visible irradiation, doping with lanthanides has been less explored. In this regard, lanthanides offer a unique electronic configuration, consisting in 4f orbitals shielded by a 5s5p external shell. This occurrence, coupled with the different occupation of the localized 4f orbitals would provide an astounding opportunity to tune these materials’ properties. In this review we will focus in depth on the modification of two promising photocatalytic transition metal oxides, namely ZnO and ZrO2, with cerium, europium and erbium atoms. The aim of the work is to provide a comprehensive overview of the influence of lanthanides on the structural, optical and electronic properties of the modified materials, emphasizing the effect of the different 4f orbital occupation in the three considered doping atoms. Moreover, a large portion of the discussion will be devoted to the structural-properties relationships evidencing the improved light absorption working mechanism of each system and the resulting enhanced photocatalytic performance in the abatement of contaminants in aqueous environments.

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“…A previous co-doping of Ce and C in our laboratory also exhibited the capability of promoting MB photodegradation on ZnO nanoparticles. 33 The incorporation of Ce and C into ZnO resulted in an extended light absorption range to include visible light and an increase in MB photodegradation rate by 3.5 times compared to undoped ZnO.…”

Section: Introductionmentioning

confidence: 98%

Enhanced photocatalytic performance of ZnO under visible light by co-doping of Ta and C using hydrothermal method

Luu,

Nguyen,

Nguyen

et al. 2024

RSC Adv.

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Enhanced Visible-Light Photocatalytic Activity of C/Ce-Codoped ZnO Nanoellipsoids Synthesized by Hydrothermal Method

Cited by 14 publications

References 26 publications

One-pot hydrothermal preparation of capsule-like nanocomposites of C/Ce-co-doped ZnO supported on graphene to enhance photodegradation

One-pot hydrothermal preparation of capsule-like nanocomposites of C/Ce-co-doped ZnO supported on graphene to enhance photodegradation

Cerium-, Europium- and Erbium-Modified ZnO and ZrO2 for Photocatalytic Water Treatment Applications: A Review

Enhanced photocatalytic performance of ZnO under visible light by co-doping of Ta and C using hydrothermal method

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