Photocatalytic treatment of aqueous solutions at high dye concentration using praseodymium-doped ZnO catalysts

Vaiano, Vincenzo; Matarangolo, Mariantonietta; Sacco, Olga; Sannino, Diana

doi:10.1016/j.apcatb.2017.03.015

Cited by 141 publications

(62 citation statements)

References 55 publications

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“…36,40 Although there are reports on the comparative photocatalytic study of rare earth metals doped ZnO nanoparticles, but the reaction mechanism of photocatalysis has not yet been well explored using dye as model pollutant. Inspired by the trailblazing studies reported by Vaiano et al 31 and Okte, 35 we have made an attempt to develop a sol-gel route for the synthesis of rare earth metals (RE ¼ La, Nd, Sm and Dy) doped ZnO nanoparticles. The potential applicability of RE-doped ZnO nanoparticles was assessed by studying the decomposition of dye derivative under different operational conditions and a possible photocatalytic mechanism of MB degradation has been discussed and elucidated by the reactive species determination results.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Vaiano et al has modied the ZnO with praseodymium and found the excellent photocatalytic activity under both UV and visible light irradiation. 31 Okte reported the synthesis of different Ln 3+ (La, Eu, Gd, Dy and Ho)-loaded ZnO and tested their roles on the decolorization of methyl orange under various conditions. 35 Complementary to the reported ndings, the role of rare earth metals doping into ZnO would be of interest for the research community working in the eld of photocatalysis primarily for the elimination of waste water.…”

Section: Introductionmentioning

confidence: 99%

“…However, the major obstacle that impedes the efficacy of ZnO is the quick recombination of charge carrier which makes it an ineffective photocatalyst during photocatalytic degradation process. [29][30][31] It is well established that the surface charge transfer and intrinsic charge carrier recombination are correlated with the structure and optical properties of photocatalysts. Keeping these issues in mind, semiconductive oxides should be modied in such a way that the separation efficiency of photogenerated charge carriers could be increased to ameliorate the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

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Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

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Rare earth metal doping into semiconductor oxides is considered to be an effective approach to enhance photocatalytic activity due to its ability to retard the electron-hole pair recombination upon excitation.Herein, we report the synthesis of different rare earth metal (La, Nd, Sm and Dy)-doped ZnO nanoparticles using a facile sol-gel route followed by evaluation of their photocatalytic activity by studying the degradation of methylene blue (MB) and Rhodamine B (RhB) under UV-light irradiation.Different standard analytical techniques were employed to investigate the microscopic structure and physiochemical properties of the prepared samples. The formation of the hexagonal wurtzite structure of ZnO was established by XRD and TEM analyses. In addition, the incorporation of rare earth metal into ZnO is confirmed by the shift of XRD planes towards lower theta values. All metal doped ZnO showed improved photocatalytic activity toward the degradation of MB, of which, Nd-doped ZnO showed the best activity with 98% degradation efficiency. In addition, mineralization of the dye was also observed, indicating 68% TOC removal in 180 min with Nd-doped ZnO nanoparticles. The influence of different operational parameters on the photodegradation of MB was also investigated and discussed in detail.Additionally, a possible photocatalytic mechanism for degradation of MB over Nd-doped ZnO nanoparticles has been proposed and involvement of hydroxyl radicals as reactive species is elucidated by radical trapping experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

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“…The absorption pattern and band gap energy measurement of the prepared PZ-17 hybrid film photocatalyst is illustrated in Figure 6. The photocatalyst's band gap was evaluated by constructing a graph according to αhv = A(hv − E g ) 2 , where α is an absorption coefficient, A is a constant, hv is the energy of a photon, E g is the optical band gap [33]. The hv was derived from hv = hc/λ, where h is the Planck constant (4.136 × 10 −15 eV), c is the velocity of the light in vacuum (2.977 × 1017 nm/s), and λ is the wavelength (nm).…”

Section: X-ray Photoelectron and Optical Property Analysismentioning

confidence: 99%

“…Wastewaters from industrial, commercial, and residential regions are responsible for the presence of a significant amount of organic contaminants in our water streams today [1,2]. Most of the artificial dyes commonly employed in the production of paper, plastics, leather, textiles, and cosmetic products today are toxic and non-biodegradable [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Photoactive Hybrid Film Photocatalyst of Polyethersulfone-ZnO for the Degradation of Methyl Orange Dye: Kinetic Study and Operational Parameters

et al. 2017

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Abstract:A facile and effective technique to immobilize photocatalyst nanoparticles by incorporating zinc oxide (ZnO) into polyethersulfone polymeric films by means of a phase inversion technique is reported. The degradation study of methyl orange (MO) dye was performed using a series of ZnO-embedded polymer hybrid systems. The photoactivity of the films increased in parallel with increased ZnO loading up to 17 wt%. The photodegradation process followed a pseudo first-order kinetics with an achievement of almost 100% MO removal in original conditions. The PZ-17 film demonstrated an excellent and comparable degradation performance up to five cycles, signifying the reliability of the film photocatalyst against ultraviolet irradiation and degradation.

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Novel Metal–Organic Framework Cocrystal Strategy for Significantly Enhancing Photocatalytic Performance

Liu,

Wang,

et al. 2023

Adv Funct Materials

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Owing to their high carrier recombination speed and low spectral utilization, it is difficult to further improve the performance of photocatalysts. In this study, a novel metal–organic framework (MOF) self‐assembled cocrystal material is developed. The guest molecule is inserted and self‐assembled with the existing MOF ligand to form an organic cocrystal. The highly ordered molecular arrangement and tight intermolecular distances between donor and acceptor molecules promote a strong π–π charge transfer interaction, facilitating the migration and separation of photogenerated charge carriers. In addition, efficient redshifts in the absorption wavelength enhance the response to visible light. Further, the unique porous structure of MOFs is beneficial for increasing the interfacial area of photocatalytic reactions, and metal ions can become the center of photogenerated carrier capture, effectively inhibiting carrier recombination. Consequently, the MOF cocrystal demonstrates remarkable efficiency in the degradation of pollutants in water, achieving a noteworthy removal efficiency of 95.31% within 15 min. Moreover, the photocatalyic reaction kinetics constant of the MOF cocrystal is 46.5 times higher, indicating the success of this new strategy in developing highly efficient photocatalytic systems.

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Photocatalytic treatment of aqueous solutions at high dye concentration using praseodymium-doped ZnO catalysts

Cited by 141 publications

References 55 publications

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Photoactive Hybrid Film Photocatalyst of Polyethersulfone-ZnO for the Degradation of Methyl Orange Dye: Kinetic Study and Operational Parameters

Novel Metal–Organic Framework Cocrystal Strategy for Significantly Enhancing Photocatalytic Performance

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