Interaction of levofloxacin with reverse micelle sol-gel synthesized TiO2 nanoparticles: Revealing ligand-to-metal charge transfer (LMCT) mechanism enhances photodegradation of antibiotics under visible light

Varma, Kiran S.; Shukla, Atindra D.; Tayade, Rajesh J.; Mishra, Manish; Nguyen, Van‐Huy; Gandhi, Vimal

doi:10.1016/j.matlet.2021.131304

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…Altering the pH of heterogeneous catalysts induces changes in surface charge, thereby impacting the catalyst's photocatalytic efficiency. Variations in pH affect the surface charge of the catalyst, the speciation of target compounds, and the availability of reactive species [40]. Changes in surface charge influence the adsorption of target molecules onto the catalyst surface, crucial for initiating degradation.…”

Section: Effect Of Phmentioning

confidence: 99%

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO₂-based photocatalysts: A review

Nair,

Gandhi,

Shukla

et al. 2024

J. Phys.: Condens. Matter

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Titanium dioxide (TiO2) based photocatalysts have been widely used as a photocatalyst for the degradation of various persistent organic compounds (POCs) in water and air. The degradation mechanism involves the generation of highly reactive oxygen species, such as hydroxyl radicals, which react with organic compounds to break down their chemical bonds and ultimately mineralize them into harmless products. In the case of pharmaceutical and pesticide molecules, TiO2 and modified TiO2 photocatalysis effectively degrade a wide range of compounds, including antibiotics, pesticides, and herbicides. The main downside is the production of dangerous intermediate products, which aren't frequently addressed in the literature that is currently available. The degradation rate of these compounds by TiO2 photocatalysis depends on factors such as the chemical structure of the compounds, the concentration of the TiO2catalyst, the intensity, the light source, and the presence of other organic or inorganic species in the solution. The comprehension of the degradation mechanism is explored to gain insights into the intermediates. Additionally, the utilization of response surface methodology (RSM) is addressed, offering a potential avenue for enhancing the scalability of the reactors. Overall, TiO2 photocatalysis is a promising technology for the treatment of pharmaceutical and agrochemical wastewater, but further research is needed to optimize the process conditions and to understand the fate and toxicity of the degradation products.

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Section: Effect Of Phmentioning

confidence: 99%

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO₂-based photocatalysts: A review

Nair,

Gandhi,

Shukla

et al. 2024

J. Phys.: Condens. Matter

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“…Levofloxacin (LVF) is an antibiotic that is widely used in the treatment of infectious diseases [16], and due to its broad-spectrum antibacterial activity, it is also used in animal husbandry and agriculture [17,18]. However, only a small part of LVF is metabolized or absorbed in the body, and most is released into the environment in its original form [16], generally due to the high stability of LVF molecules, most of which will be metabolized in the natural environment in the form of active species after being consumed, causing irreversible damage to the ecological environment [19] due to their persistence towards biodegradation [20].…”

Section: Organohalidesmentioning

confidence: 99%

“…Among them, photocatalytic technology is considered the most promising method because it is economical, reusable, and ecological [16]. Photocatalysis has been widely reported for the degradation of dyes and antibiotics; several investigations have recently been published on the degradation of dyes [31][32][33][34][35][36] and on the degradation of antibiotics, specifically LVF [16][17][18][19][20].…”

Section: Organohalidesmentioning

confidence: 99%

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Cerón-Urbano,

Aguilar,

Diosa

et al. 2023

Nanomaterials

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In this research work, the photocatalytic capacity shown by the nanoparticles of the CaTiO3 system was evaluated to degrade two pollutants of emerging concern, namely methyl orange (MO)—considered an organic contaminating substance of the textile industry that is non-biodegradable when dissolved in water—and levofloxacin (LVF), an antibiotic widely used in the treatment of infectious diseases that is released mostly to the environment in its original chemical form. The synthesis process used to obtain these powders was the polymeric precursor method (Pechini), at a temperature of 700 °C for 6 h. The characterization of the obtained oxide nanoparticles of interest revealed the presence of a majority perovskite-type phase with an orthorhombic Pbnm structure and a minority rutile-type TiO2 phase, with a P42/mnm structure and a primary particle size <100nm. The adsorption–desorption isotherms of the synthesized solids had H3-type hysteresis loops, characteristic of mesoporous solids, with a BET surface area of 10.01m2/g. The Raman and FTIR spectroscopy results made it possible to identify the characteristic vibrations of the synthesized system and the characteristic deformations of the perovskite structure, reiterating the results obtained from the XRD analysis. Furthermore, a bandgap energy of ~3.4eV and characteristic emissions in the violet (437 nm/2.8 eV) and orange (611 nm/2.03 eV) were determined for excitation lengths of 250 nm and 325 nm, respectively, showing that these systems have a strong emission in the visible light region and allowing their use in photocatalytic activity to be potentialized. The powders obtained were studied for their photocatalytic capacity to degrade methyl orange (MO) and levofloxacin (LVF), dissolved in water. To quantify the coloring concentration, UV–visible spectroscopy was used considering the variation in the intensity of the characteristic of the greatest absorption, which correlated with the change in the concentration of the contaminant in the solution. The results showed that after irradiation with ultraviolet light, the degradation of the contaminants MO and LVF was 79.4% and 98.1% with concentrations of 5 g/L and 10 g/L, respectively.

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“…Previous research has successfully prepared TiO 2 nanoparticles using various plant extracts, such as Jatropha curcas L., Citrus Limetta, Cinnamon, Syzygium Cumini, Citrus Limon juice, and costus speciosus. These nanoparticles have found applications in areas like antioxidant and antimicrobial studies [18,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Green Development of Titanium Dioxide Using Astragalus boeticus for the Degradation of Cationic and Anionic Dyes in an Aqueous Environment

Maanane,

El Yadini,

El Alouani

et al. 2023

Water

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Wastewater discharge from the textile industry poses significant health problems for humans. As a result, the effluent waters are often rich in dyes, whose low natural decomposition capacity makes their treatment complex, thus contributing to environmental degradation. It becomes imperative to implement effective solutions for treating these contaminated waters, with a primary goal: to make them fit for human consumption. The present study focuses on the development of green TiO2 nanoparticles (TiO2-NP) using titanium (IV) isopropoxide as a precursor, along with the extract of Astragalus boeticus (A.B). These green TiO2 nanoparticles have been developed for use as highly efficient photocatalysts for the degradation of two types of dyes: Reactive Yellow 161 (RY161), an anionic dye, and Crystal Violet (CV), a cationic dye. The structural, microstructural, and optical properties of the synthesized material were characterized using XRD, FTIR, SEM, EDX, and UV-Vis methods. The results of these analyses revealed that the nanoparticles have a size of approximately 68 nm, possess an anatase structure, exhibit a spherical surface morphology, and have a band gap of 3.22 eV. The photocatalytic activity of the synthesized material demonstrated a 94.06% degradation of CV dye in a basic environment (pH = 10) within 30 min, with an initial CV concentration of 10 mg/L and a catalyst mass of 1 g/L. Additionally, it achieved a 100% degradation of RY161 dye in an acidic environment (pH = 4) within 90 min, with an initial RY161 concentration of 30 mg/L and a catalyst mass of 1 g/L. Furthermore, the recycling study indicated that the green TiO2 NPs catalyst could be effectively reused for up to five cycles. These experimental findings suggest that the developed TiO2 catalyst holds significant potential as an eco-friendly solution for remediating aqueous media polluted by both anionic and cationic dyes.

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Interaction of levofloxacin with reverse micelle sol-gel synthesized TiO2 nanoparticles: Revealing ligand-to-metal charge transfer (LMCT) mechanism enhances photodegradation of antibiotics under visible light

Cited by 12 publications

References 15 publications

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO₂-based photocatalysts: A review

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO₂-based photocatalysts: A review

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Green Development of Titanium Dioxide Using Astragalus boeticus for the Degradation of Cationic and Anionic Dyes in an Aqueous Environment

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Interaction of levofloxacin with reverse micelle sol-gel synthesized TiO2 nanoparticles: Revealing ligand-to-metal charge transfer (LMCT) mechanism enhances photodegradation of antibiotics under visible light

Cited by 12 publications

References 15 publications

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO2-based photocatalysts: A review

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO2-based photocatalysts: A review

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Green Development of Titanium Dioxide Using Astragalus boeticus for the Degradation of Cationic and Anionic Dyes in an Aqueous Environment

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Product

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Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO₂-based photocatalysts: A review

Mechanisms in the photocatalytic breakdown of persistent pharmaceutical and pesticide molecules over TiO₂-based photocatalysts: A review