Nanostructured Materials for the Photocatalytic Degradation of Organic Pollutants in Water

Honorio, Luzia M. C.; Trigueiro, Pollyana; Viana, Bartolomeu C.; Ribeiro, Alessandra Braga; Osajima, Josy A.

doi:10.1007/978-3-030-33745-2_3

Cited by 16 publications

(7 citation statements)

References 141 publications

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“…When a photon of light hits the surface of a semiconductor, it provides energy equal to or greater than the bandgap of the semiconductor. This energy causes an electron from the valence band to move to the conduction band, leaving behind a hole [ 116 ]. These processes form electron–hole pairs (e − /h + ), promoting oxidation/reduction reactions on the semiconductor surface and facilitating the breakdown of organic molecules.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…This is very worrying because recent research estimates that by 2050 around 65% of Earth’s population will face a shortage of drinking water [ 2 ]. Among the anthropic activities that generate waste, intense industrial activity has stood out for releasing recalcitrant compounds, such as dyes and herbicides, which pose risks to the ecosystem and human health [ 3 , 4 ]. These pollutants have complex carbon chains that are resistant to degradation by the environment and are difficult to remove in conventional water treatments [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Photoresponsive Activity of the Zn0.94Er0.02Cr0.04O Compound with Hemisphere-like Structure Obtained by Co-Precipitation

et al. 2023

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In this work, a ZnO hemisphere-like structure co-doped with Er and Cr was obtained by the co-precipitation method for photocatalytic applications. The dopant’s effect on the ZnO lattice was investigated using X-ray diffraction, Raman, photoluminescence, UV-Vis and scanning electron microscopy/energy dispersive spectroscopy techniques. The photocatalytic response of the material was analyzed using methylene blue (MB) as the model pollutant under UV irradiation. The wurtzite structure of the Zn0.94Er0.02Cr0.04O compound presented distortions in the lattice due to the difference between the ionic radii of the Cr3+, Er3+ and Zn2+ cations. Oxygen vacancy defects were predominant, and the energy competition of the dopants interfered in the band gap energy of the material. In the photocatalytic test, the MB degradation rate was 42.3%. However, using optimized H2O2 concentration, the dye removal capacity reached 90.1%. Inhibitor tests showed that •OH radicals were the main species involved in MB degradation that occurred without the formation of toxic intermediates, as demonstrated in the ecotoxicity assays in Artemia salina. In short, the co-doping with Er and Cr proved to be an efficient strategy to obtain new materials for environmental remediation.

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“…With advances in technology and the growing population without adequate planning, the limitless release of residual effluents is directly impacting the environment and represents an eminent concern in environmental management policy [1,2]. In addition, high concentrations of micropollutants, organic/synthetic chemicals, pesticides, heavy metals, and other emerging contaminants are significant concerns for human health and environmental safety [3,4].…”

Section: Introductionmentioning

confidence: 99%

TiO2/Karaya Composite for Photoinactivation of Bacteria

et al. 2022

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A TiO2/Karaya composite was synthesized by the sol-gel method for the photoinactivation of pathogens. This is the first time that we have reported this composite for an antimicrobial approach. The structure, morphology, and optical properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-rays (EDS), Fourier transform infrared spectroscopy (FTIR), and diffuse reflectance, and the surface area was characterized by the BET method. The XRD and EDS results showed that the TiO2/Karaya composite was successfully stabilized by the crystal structure and pore diameter distribution, indicating a composite of mesoporous nature. Furthermore, antibacterial experiments showed that the TiO2/Karaya composite under light was able to photo-inactivate bacteria. Therefore, the composite is a promising candidate for inhibiting the growth of bacteria.

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Nanostructured Materials for the Photocatalytic Degradation of Organic Pollutants in Water

Cited by 16 publications

References 141 publications

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

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

Photoresponsive Activity of the Zn0.94Er0.02Cr0.04O Compound with Hemisphere-like Structure Obtained by Co-Precipitation

TiO2/Karaya Composite for Photoinactivation of Bacteria

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