Sol-gel Preparation of Different Crystalline Phases of TiO&lt;SUB&gt;2&lt;/SUB&gt; Nanoparticles for Photocatalytic Degradation of Methylene Blue in Aqueous Solution

Zulmajdi, Siti Lailatul N.; Zamri, Nur Izzah Iwanina; Mahadi, Abdul Hanif; Rosli, Mohd Yameany H.; Ja’afar, Fairuzeta; Yasin, Hartini M.; Kusrini, Eny; Hobley, Jonathan; Usman, Anwar

doi:10.12691/ajn-7-1-5

Cited by 16 publications

(7 citation statements)

References 35 publications

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“…The precise Bragg diffraction peaks signify the crystalline nature of the nanoparticles. The Bragg diffraction peaks designated by (A) agreed with the anatase phase of TiO 2 with tetragonal arrangement [31][32][33], especially, the two most intense diffraction peaks found in all of the samples, viz., at (2θ) 25.0 • and 48.0 • are typical of the anatase phase. This result indicates that all of the prepared TiO 2 nanoparticles were predominantly of the anatase phase.…”

Section: Morphological Structural Photophysical and Thermal Analysis ...mentioning

confidence: 56%

“…Molecules 2023, 28, x FOR PEER REVIEW 6 of 21 The degree of crystallinity (λ) of the synthesized TiO2 nanoparticles calculated from the XRD data [32] according to Equation (1),…”

Section: Morphological Structural Photophysical and Thermal Analysis ...mentioning

confidence: 99%

“…MB is cationic whereas MO is anionic. The choice of these model compounds was made to exploit their contrasting chemical nature for studying the selectivity of the nanoparticles for catalyzing the photodegradation of a particular class of compounds, and also because they have previously been extensively used as model compounds for photodegradation study [4,5,32].…”

Section: Photocatalytic Degradation Studymentioning

confidence: 99%

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Selectivity of Sol-Gel and Hydrothermal TiO2 Nanoparticles towards Photocatalytic Degradation of Cationic and Anionic Dyes

Islam,

Roni,

Ali

et al. 2023

Molecules

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Titanium dioxide (TiO2) nanoparticles have been extensively studied for catalyzing the photo-degradation of organic pollutants, the photocatalyst being nonselective to the substrate. We, however, found that TiO2 nanoparticles prepared via the sol-gel and hydrothermal synthetic routes each possess a definite specificity to the charge of the substrate for photodegradation. The nanoparticles were characterized by SEM, FTIR, XRD, TGA, and UV-visible spectra, and the photocatalytic degradation under UV-B (285 nm) irradiation of two model compounds, anionic methyl Orange (MO) and cationic methylene blue (MB) was monitored by a UV-visible spectrophotometer. Untreated sol-gel TiO2 nanoparticles (Tsg) preferentially degraded MO over MB (90% versus 40% in two hours), while after calcination at 400 °C for two hours (Tsgc) they showed reversed specificity (50% MO versus 90% MB in one hour). The as-prepared hydrothermal TiO2 nanoparticles (Tht) behaved in the opposite sense of Tsg (41% MO versus 91% MB degraded in one and a half hours); calcination at 400 °C (Thtc) did not reverse the trend but enhanced the efficiency of degradation. The study indicates that TiO2 nanoparticles can be made to degrade a specific class of organic pollutants from an effluent facilitating the recycling of a specific class of pollutants for cost-effective effluent management.

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Section: Morphological Structural Photophysical and Thermal Analysis ...mentioning

confidence: 56%

“…Molecules 2023, 28, x FOR PEER REVIEW 6 of 21 The degree of crystallinity (λ) of the synthesized TiO2 nanoparticles calculated from the XRD data [32] according to Equation (1),…”

Section: Morphological Structural Photophysical and Thermal Analysis ...mentioning

confidence: 99%

Section: Photocatalytic Degradation Studymentioning

confidence: 99%

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Selectivity of Sol-Gel and Hydrothermal TiO2 Nanoparticles towards Photocatalytic Degradation of Cationic and Anionic Dyes

Islam,

Roni,

Ali

et al. 2023

Molecules

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“…AgNPs have been synthesized under similar conditions and tested for their ability to decompose MB molecules. The activity of TiO 2 NPs produced via the sol-gel method has been reported by Zulmajdi et al [22]. So, rather than focusing on the photocatalytic activity of pure AgNPs and TiO 2 NPs, the present study deals with the degradation of MB using Ag/TiO 2 nanocomposite as a catalyst.…”

Section: Mechanism Of Photodegradation Of Methyl Bluementioning

confidence: 89%

Concurrent Synthesis and Immobilization of Ag Nanoparticles over TiO2 via Plasma Reduction for Photocatalytic Treatment of Methyl Blue in Water

et al. 2021

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Pure TiO2 nanoparticles (TiO2NPs) were produced via the sol–gel method and then coated with silver nanoparticles (AgNPs) to reduce their optical band gap. The concurrent synthesis and immobilization of AgNPs over TiO2NPs was achieved through the interaction of an open-air argon plasma jet with a solution of silver nitrate/stabilizer/TiO2NPs. The one-pot plasma synthesis and coating of AgNPs over TiO2NPs is a more straightforward and environmentally friendly method than others. The plasma-produced Ag/TiO2 nanocomposites were characterized and tested for their photocatalytic potential by degrading different concentrations of methyl blue (MB) in water. The dye concentration, oxidant dose, catalyst dose, and reaction time were also optimized for MB degradation. XRD results revealed the formation of pure AgNPs, pure TiO2NPs, and Ag/TiO2 nanocomposites with an average grain size of 12.36 nm, 18.09 nm, and 15.66 nm, respectively. The immobilization of AgNPs over TiO2NPs was also checked by producing SEM and TEM images. The band gap of AgNPs, TiO2NPs, and Ag/TiO2 nanoparticles was measured about 2.58 eV, 3.36 eV, and 2.86 eV, respectively. The ultraviolet (UV) results of the nanocomposites were supportive of the degradation of synthetic dyes in the visible light spectrum. The AgNPs in the composite not only lowered the band gap but also obstructed the electron–hole recombinations. The Ag/TiO2 composite catalyst showed 90.9% degradation efficiency with a 5 ppm dye concentration after 120 min of light exposure.

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“…Among these AOPs, a heterogeneous photocatalytic process employing metal oxides, metal sulfides, and perovskite-type materials as photocatalysts is more widely used for the removal of persistent pollutants, creating safe end products [133]. More specifically, photocatalysis using anatase TiO 2 nanoparticles is the most promising method due to their high photocatalytic activity, cost-effectivity, environmental friendliness, and chemical and physical inertness [134][135][136][137]. Therefore, several research groups have published numerous papers on the usage of AOPs using TiO 2 -based nanoparticles as catalysts in the photocatalytic degradation of pharmaceuticals in water [138][139][140].…”

Section: Reported Studies Of the Advanced Oxidation Processes Of Phar...mentioning

confidence: 99%

Recent Advances in Advanced Oxidation Processes for Degrading Pharmaceuticals in Wastewater—A Review

Roslan,

Lau,

Suhaimi

et al. 2024

Catalysts

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A large variety of pharmaceutical compounds have recently been detected in wastewater and natural water systems. This review highlighted the significance of removing pharmaceutical compounds, which are considered indispensable emerging contaminants, from wastewater and natural water systems. Various advanced oxidation processes (AOPs), including UV-H2O2, Fenton and photo-Fenton, ozone-based processes, photocatalysis, and physical processes, such as sonolysis, microwave, and electron beam irradiation, which are regarded as the most viable methods to eliminate different categories of pharmaceutical compounds, are discussed. All these AOPs exhibit great promising techniques, and the catalytic degradation process of the emerging contaminants, advantages, and disadvantages of each technique were deliberated. Heterogeneous photocatalysis employing metal oxides, particularly anatase TiO2 nanoparticles as catalysts activated by UV light irradiation, was reviewed in terms of the electron–hole separation, migration of the charge carriers to the catalyst surfaces, and redox potential of the charge carriers. This brief overview also emphasized that anatase TiO2 nanoparticles and TiO2-based nanomaterials are promising photocatalysts, and a combination of photocatalysis and other AOPs enhanced photocatalytic degradation efficiency. Finally, the challenges of applying anatase TiO2-based photocatalysis in environmental remediation and wastewater treatments to degrade pharmaceutical compounds, including mass spectroscopic analysis and a biological activity test of by-products of the emerging contaminants resulting from photocatalysis, are summarized.

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Sol-gel Preparation of Different Crystalline Phases of TiO<SUB>2</SUB> Nanoparticles for Photocatalytic Degradation of Methylene Blue in Aqueous Solution

Cited by 16 publications

References 35 publications

Selectivity of Sol-Gel and Hydrothermal TiO2 Nanoparticles towards Photocatalytic Degradation of Cationic and Anionic Dyes

Selectivity of Sol-Gel and Hydrothermal TiO2 Nanoparticles towards Photocatalytic Degradation of Cationic and Anionic Dyes

Concurrent Synthesis and Immobilization of Ag Nanoparticles over TiO2 via Plasma Reduction for Photocatalytic Treatment of Methyl Blue in Water

Recent Advances in Advanced Oxidation Processes for Degrading Pharmaceuticals in Wastewater—A Review

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