Nanotubes/nanorods-like structures of La-doped ZnO for degradation of Methylene Blue and Ciprofloxacin

Soares, A.S.; Araujo, Francisca P.; Osajima, Josy A.; Guerra, Y.; Viana, Bartolomeu C.; Peña-Garcia, R.

doi:10.1016/j.jphotochem.2023.115235

Cited by 36 publications

(11 citation statements)

References 79 publications

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“…Similar structures were presented by Robles-Águila et al [78] for ZnO doped with Al and Ni and by Rahmati, A. et al [79] for Cu-doped ZnO. It is believed that factors such as synthesis route, pH value, and calcination temperature have a major influence on the final morphology of the compounds [12,26,80]. In addition, it is important to highlight that the use of cashew gum may have acted as an inhibitor or mediating agent for the growth of particles.…”

Section: Morphological Analysis Of the Zn 1−x Ni X O Systemsupporting

confidence: 77%

“…In general, ZnO synthesis is carried out under controlled conditions to ensure the purity of the compound and obtain the desired properties [23]. Furthermore, ZnO synthesis can be adjusted to obtain different particle shapes and sizes, which can influence, for example, its optical and surface properties [20,[24][25][26]. In addition, the growth of ZnO oxides using plant derivatives has emerged as a green synthetic approach in recent years [27,28].…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Ni-Doped ZnO Nanoparticles Using Cashew Gum: Investigation of the Structural, Optical, and Photocatalytic Properties

Lins,

Jerônimo,

Barbosa

et al. 2023

Molecules

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This work adopted a green synthesis route using cashew tree gum as a mediating agent to obtain Ni-doped ZnO nanoparticles through the sol–gel method. Structural analysis confirmed the formation of the hexagonal wurtzite phase and distortions in the crystal lattice due to the inclusion of Ni cations, which increased the average crystallite size from 61.9 nm to 81.6 nm. These distortions resulted in the growth of point defects in the structure, which influenced the samples’ optical properties, causing slight reductions in the band gaps and significant increases in the Urbach energy. The fitting of the photoluminescence spectra confirmed an increase in the concentration of zinc vacancy defects (VZn) and monovacancies (Vo) as Zn cations were replaced by Ni cations in the ZnO structure. The percentage of VZn defects for the pure compound was 11%, increasing to 40% and 47% for the samples doped with 1% and 3% of Ni cations, respectively. In contrast, the highest percentage of VO defects is recorded for the material with the lowest Ni ions concentration, comprising about 60%. The influence of dopant concentration was also reflected in the photocatalytic performance. Among the samples tested, the Zn0.99Ni0.01O compound presented the best result in MB degradation, reaching an efficiency of 98.4%. Thus, the recovered material underwent reuse tests, revealing an efficiency of 98.2% in dye degradation, confirming the stability of the photocatalyst. Furthermore, the use of different inhibitors indicated that •OH radicals are the main ones involved in removing the pollutant. This work is valuable because it presents an ecological synthesis using cashew gum, a natural polysaccharide that has been little explored in the literature.

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Section: Morphological Analysis Of the Zn 1−x Ni X O Systemsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ni-Doped ZnO Nanoparticles Using Cashew Gum: Investigation of the Structural, Optical, and Photocatalytic Properties

Lins,

Jerônimo,

Barbosa

et al. 2023

Molecules

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“…A broad visible PL emission band ranging from 470 to 535 nm is exhibited in the as-prepared sample, corresponding to the deep-level emission defects that arise due to zinc vacancies (V Zn ), oxygen vacancies (V O − ) and defects in the band gap of ZnO. 39,40 A strong PL emission peak is observed at 468 nm in the annealed sample. This implies that band-gap-related defects may be removed after annealing, as was also confirmed by the XRD and UV-Vis spectroscopy results.…”

Section: Resultsmentioning

confidence: 98%

Photoluminescence and antibacterial performance of sol–gel synthesized ZnO nanoparticles

Rathore,

Verma,

Akhani

et al. 2024

Mater. Adv.

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“…In this sense, the doping process is a widely employed strategy to modify its properties [ 15 , 16 , 17 ]. Doping modifies the number of defects within the material, thereby retarding the recombination of electron–hole pairs [ 18 , 19 ]. Notably, ZnO doped with rare earth cations has emerged as an effective method for photocatalytic applications [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Er-Doped ZnO Nanoparticles: An Investigation on the Methylene Blue, Eosin, and Ibuprofen Removal by Photodegradation

Silva,

Castro-Lopes,

Jerônimo

et al. 2024

Molecules

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We present a study on the green synthesis of undoped and Er-doped ZnO compounds using Mangifera indica gum (MI). A set of tests were conducted to assess the structure of the material. The tests included X-ray diffraction, Raman, and Fourier-transform infrared spectroscopy. Optical properties were studied using diffuse reflectance and photoluminescence. Morphological and textural investigations were done using SEM images and N2 adsorption/desorption. Furthermore, photocatalytic tests were performed with methylene blue (MB), yellow eosin (EY), and the pharmaceutical drug ibuprofen (IBU) under UV irradiation. The study demonstrated that replacing the stabilizing agent with Mangifera indica gum is an effective method for obtaining ZnO nanoparticles. Additionally, the energy gap of the nanoparticles exhibits a slight reduction in value. Photoluminescence studies showed the presence of zinc vacancies and other defects in both samples. In the photocatalytic test, the sample containing Er3+ exhibited a degradation of 99.7% for methylene blue, 81.2% for yellow eosin, and 52.3% for ibuprofen over 120 min. In the presence of methyl alcohol, the degradation of MB and EY dyes is 16.7% and 55.7%, respectively. This suggests that hydroxyl radicals are responsible for the direct degradation of both dyes. In addition, after the second reuse, the degradation rate for MB was 94.08%, and for EY, it was 82.35%. For the third reuse, the degradation rate for MB was 97.15%, and for EY, it was 17%. These results indicate the significant potential of the new semiconductor in environmental remediation applications from an ecological synthesis.

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Nanotubes/nanorods-like structures of La-doped ZnO for degradation of Methylene Blue and Ciprofloxacin

Cited by 36 publications

References 79 publications

Facile Synthesis of Ni-Doped ZnO Nanoparticles Using Cashew Gum: Investigation of the Structural, Optical, and Photocatalytic Properties

Facile Synthesis of Ni-Doped ZnO Nanoparticles Using Cashew Gum: Investigation of the Structural, Optical, and Photocatalytic Properties

Photoluminescence and antibacterial performance of sol–gel synthesized ZnO nanoparticles

Green Synthesis of Er-Doped ZnO Nanoparticles: An Investigation on the Methylene Blue, Eosin, and Ibuprofen Removal by Photodegradation

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