Preparation and photocatalytic properties of hexagonal-shaped ZnO:Sm3+ by microwave-assisted hydrothermal method

Carvalho, Raquel Guilherme de; Tavares, M. T. S.; Oliveira, F. K. F.; Nascimento, Rubens Maribondo do; Longo, Elson; Li, M. S.; Paskocimas, C. A.; Bomio, M. R. D.; Motta, F. V.

doi:10.1007/s10854-017-6496-3

Cited by 11 publications

(3 citation statements)

References 35 publications

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“…The sample presented the ZnO diffraction pattern with the wurtzite-type phase (JCPDS 36-1451). This was a positive factor because, according to the literature, this structure shows good photocatalytic activity [36][37][38]. No other crystalline phases were observed.…”

Section: Methodsmentioning

confidence: 88%

Photodegradation of Rhodamine B catalyzed by ZnO pellets

et al. 2019

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This paper describes the development of ZnO semiconductors applied as photocatalysts for the degradation of water contaminants, with the shape of ceramic pellets thick enough to maintain their structures, prepared by slip casting and sintering. The samples presented porosities around 40% and densities around 3.4 g/cm 3 , which represented about 61% of the theoretical density of ZnO. After obtaining the ceramic samples, the degradation of Rhodamine B dye by photocatalysis was evaluated in six cycles of degradation. After the cycles, changes in the surface of the samples were verified, possibly due to leaching during photocatalysis since they presented mean grain sizes of 0.61 μm before and 0.36 μm after the photocatalysis. The ceramic ZnO samples were able to satisfactorily degrade Rhodamine B for several cycles, resulting in successful reuse of photocatalysts and increased facility of removing the photocatalysts from the medium after degradation compared to powders in suspensions.

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Section: Methodsmentioning

confidence: 88%

Photodegradation of Rhodamine B catalyzed by ZnO pellets

et al. 2019

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“…Samarium doping resulted in a reduction in the band gap of ZnO. Thus, increasing the visible light absorption results in a better increase in catalytic activity, as has been observed in the photodegradation test [61]. Meanwhile, Korake et al [62] used the microwave-assisted synthesis method and obtained a degradation efficiency of 91 % for 180 UV irradiation.…”

Section: Microwave-assisted Methodsmentioning

confidence: 91%

“…The microwave-assisted hydrothermal synthesis method has been carried out by Carvalho et al [61] to synthesize Sm-doped ZnO. The degradation efficiency obtained was 99 % within 120 min using MB waste under UV radiation.…”

Section: Microwave-assisted Methodsmentioning

confidence: 99%

Advances in Rare Earth‐Doped ZnO Photocatalysts: Enhancing Photogenerated Electron‐Hole Pairs for Radical Atom Generation

Hasanah,

Ikbal,

Tahir

2024

ChemBioEng Reviews

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Zinc oxide (ZnO) is a promising material with a diverse range of applications, spanning gas sensing, photonics, photovoltaics, energy conversion, water splitting, photocatalysis, and transparent trapping. However, ZnO limited responsiveness to visible light affected to low photogenerated electron‐hole pairs (charge), low quantum efficiency, and high recombination of charge. In this review, we are addressing innovative strategies, including incorporation rare earth elements as a trap of electron to reduce recombination charge via ZnO doping from analysis 118 referenced sources. We found that hydrothermal shows very good methods for boosting efficiency up to 100 % within 60‐min. We found that for rare‐earth metals La and Ce as a doping show highest efficiency up to 100 % within 120 min irradiations, means that efficient as a trap for reducing recombination of charge. The potential of rare earth doped ZnO will enhance photogenerated electron‐hole pairs, catalyzing the generation of radical atoms via oxidation and reduction reactions. This review encapsulates the most current findings, it serves as a valuable resource for scholars seeking to advance their understanding of rare earth doped ZnO photocatalysts and developing innovative photocatalytic technologies.

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