Highly efficient photodegradation of methylene blue by a composite photocatalyst of bismuth nanoparticles on silicon nanowires

Naffeti, Mariem; Zaïbi, Mohamed Ali; Nefzi, Chayma; García-Arias, Alejandro Vidal; Chtourou, Radhouane; Postigo, P. A.

doi:10.1016/j.eti.2023.103133

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…51 In addition, the other nanomaterials such as CuNiFe 2 O 4 /g-C 3 N 4 nanocomposite and bismuth nanoparticle had the MB degradation with the half-life time of more than 60 min. 52,53 This is also evident by comparing the photocatalytic activity on carbon-coated V 2 O 3 / CNT/TiO 2 heated at 973 K (MB half-life time = 70 min under 8 W visible-light irradiation) 54 and the photocatalytic activity on TiO 2 in CNTs heated at 573−773 K (MB half-life time = 75 min under 15 W visible-light irradiation). 55 Both the studies used 0.05 g of nanocatalyst, which is three times higher in amount than in this work.…”

Section: Resultsmentioning

confidence: 85%

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Watanabe,

Takawane,

Baba

et al. 2023

J. Phys. Chem. C

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TiO2 anatase, which exhibits the highest catalytic performance, transforms to rutile at 800 K. To inhibit the transition of anatase to rutile, several strategies, such as metal and/or non-metal doping, oxygen enrichment, and surface coating, have been studied, resulting in stable anatase within 773–1273 K. However, highly stable anatase without dopants is still required. Here, a new approach, which involves the synthesis of anatase nanocatalysts in carbon nanotubes (CNTs), was proposed to inhibit the anatase-to-rutile transition. The nanocatalysts exhibited high thermal anatase stability along with a suppression of the crystal growth up to 1200 K. The highly stable anatase in CNTs also exhibited high photocatalytic activity, which was evaluated based on methylene blue decomposition under visible- and UV-light irradiation. This was attributed to the maintenance of the small crystal size of the nanocatalysts in addition to a synergetic effect between the TiO2 nanocatalysts and CNTs.

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Section: Resultsmentioning

confidence: 85%

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Watanabe,

Takawane,

Baba

et al. 2023

J. Phys. Chem. C

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“…(1) W1 [77]: the photocatalytic reaction was conducted in a photocatalytic reactor under ultraviolet and visible light irradiations using a 100 W mercury lamp (253 nm) and a 100 W LED (589 nm). A photocatalyst weight equal to 200 mg (Cu-TiO 2 /50-C 3 N 4 ) was added to 0.1 L of an MB aqueous solution (10 ppm, initial concentration); (2) W2 [78]: the photocatalytic performances of Bi@SiNWs nanocomposites were evaluated by the degradation of MB under UV light irradiation. All the experiments were performed in a photoreactor irradiated by a UV-C tube lamp (Philips, 55 W).…”

Section: Electrical Energy Consumption Comparisonmentioning

confidence: 99%

Characterization and Photocatalytic and Antibacterial Properties of Ag- and TiOx-Based (x = 2, 3) Composite Nanomaterials under UV Irradiation

Morante,

Folliero,

Dell’Annunziata

et al. 2024

Materials

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Metal and metal oxide nanostructured materials have been chemically and physically characterized and tested concerning methylene blue (MB) photoremoval and UV antibacterial activity against Escherichia coli and Staphylococcus aureus. In detail, silver nanoparticles and commercial BaTiO3 nanoparticles were modified to obtain nanocomposites through sonicated sol–gel TiO2 synthesis and the photodeposition of Ag nanoparticles, respectively. The characterization results of pristine nanomaterials and synthetized photocatalysts revealed significant differences in specific surface area (SSA), the presence of impurities in commercial Ag nanoparticles, an anatase phase with brookite traces for TiO2-based nanomaterials, and a mixed cubic–tetragonal phase for BaTiO3. Silver nanoparticles exhibited superior antibacterial activity at different dosages; however, they were inactive in the photoremoval of the dye. The silver–TiOx nanocomposite demonstrated an activity in the UV photodegradation of MB and UV inhibition of bacterial growth. Specifically, TiO2/AgNP (30–50 nm) reduced growth by 487.5 and 1.1 × 103 times for Escherichia coli and Staphylococcus aureus, respectively, at a dose of 500 ug/mL under UV irradiation.

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“…This study also has the advantage of using a low amount of catalyst (20 mg) for achieving efficient MB photodegradation. Naffeti et al [48] conducted a study to synthesize green, economical, and novel bismuth-altered silicon nanowires (Bi@SiNWs) for the photocatalytic degradation of MB using UV and solar irradiations. Bi@SiNWs showed remarkable photocatalytic ability for the degradation of MB up to 44% and 89% under UV and solar irradiation, respectively, within 120 min.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

Ali,

Maafa,

Qudsieh

2024

Water

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This study presents an efficient way to degrade methylene blue (MB) present in water via photodegradation using H2O2 as an oxidant in the presence of UV irradiation and without the use of a catalyst. The reaction variables, employed to evaluate the performance of the photodegradation process using the UV/H2O2 system, were the amount of H2O2 in the reacting solution and the initial concentration of methylene blue. The degradation of methylene blue in the presence of H2O2 was not observed during agitation in darkness. The degradation time decreased as the H2O2 concentration increased after the ideal concentration was reached. At this stage, as it began to scavenge the generated hydroxyl radicals, the rate of degradation became inversely proportional to the concentration of H2O2. An increase in the quantities of MB and H2O2 improved the degradation efficiency because the oxidation process was aided by using the appropriate amount of H2O2 and an ideal length of UV light exposure. The experimental data obtained were well-fitted to zero-order reaction kinetics based on the high values of the correlation coefficient. It is believed that the OH radicals (OH●) generated during the breakdown of H2O2 and the generated O2●− species attack the MB molecules and produce MB radicals (MB●). These MB radicals further experience oxidation and convert to intermediates and finally to CO2 and H2O. The UV/H2O2 system proved to be quite efficient for the photodegradation of methylene blue without the use of any solid catalyst. This UV/H2O2 system can be employed in the degradation of other organic pollutants in industrial wastewater.

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Highly efficient photodegradation of methylene blue by a composite photocatalyst of bismuth nanoparticles on silicon nanowires

Cited by 12 publications

References 45 publications

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Characterization and Photocatalytic and Antibacterial Properties of Ag- and TiOx-Based (x = 2, 3) Composite Nanomaterials under UV Irradiation

Photodegradation of Methylene Blue Using a UV/H2O2 Irradiation System

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