Photocatalytic and bactericidal behaviors of Ag/TiO2 doped biochar through Ball–milling approach

Chakhtouna, Hanane; Ouhssain, Ali; Kadmiri, Issam Meftah; Benzeid, Hanane; Zari, Nadia; Qaiss, Abou el kacem; Bouhfid, Rachid

doi:10.1016/j.jphotochem.2023.114971

Cited by 7 publications

(4 citation statements)

References 42 publications

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“…This means that drinking water had a higher concentration of hydroxyl ions, which led to the formation of more hydroxyl radicals in the valence band. Therefore, a higher number of free radicals is the reason for the faster and more efficient degradation of paracetamol in drinking water compared to when it is Through Schottky heterojunction at the TiO 2 /Ag interface, the photogenerated electrons located in the CB of TiO 2 are transferred to Ag [62]. Through their reaction with dissolved oxygen, superoxide radicals are created [63].…”

Section: Photocatalytic Efficiency Of Pure and Silver-photofixed Sol-...mentioning

confidence: 99%

“…The likely mechanism of paracetamol degradation by pure and silver-photofixed titanium dioxide using ultraviolet illumination. TiO 2 absorbs light, which excites an electron to move from the valance band (VB) to the conduction band (CB), creating a hole in the valance band and causing a charge separation.Through Schottky heterojunction at the TiO 2 /Ag interface, the photogenerated electrons located in the CB of TiO 2 are transferred to Ag[62]. Through their reaction with dissolved oxygen, superoxide radicals are created[63].…”

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The Solvent Role for the Decomposition of Paracetamol in Distilled and Drinking Water by Pure and Ag-Modified TiO2 Sol–Gel Powders

Bachvarova-Nedelcheva,

Iordanova,

Kaneva

2024

Materials

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In this study, pure TiO2 gels were synthesized by applying the sol–gel method, using Ti(IV) butoxide with the addition of two different solvents, namely ethylene glycol (EG) and isopropanol (isop), with only air moisture present. It was established using XRD that the gel prepared with the addition of EG was amorphous even at 400 °C, while the other gel was amorphous up to 300 °C. It was found that TiO2 (anatase) had a dominant crystalline phase during heating to 600 °C, while at 700 °C, TiO2 (rutile) appeared. The as-obtained powdered materials were annealed at 500 °C and subsequently underwent photocatalytic tests with paracetamol. Additionally, the TiO2 samples were modified with Ag+ co-catalysts (10−2 M), using photofixation by UV illumination. The photocatalytic activity of the Ag-modified powders was also tested in the photodegradation of a commonly used paracetamol in aqueous solution under UV light illumination. The obtained data exhibited that the annealed samples had better photocatalytic efficiency and decomposed paracetamol faster in comparison to the non-annealed sol–gel powders. The highest degradation efficiency was observed for the TBT/isop/Ag material, with degradation efficiencies average values of 65.59% and 75.61% paracetamol achieved after the third cycle of photocatalytic treatment. The co-catalytically modified powders had higher photocatalytic efficiency in comparison to the pure nanosized powders. Moreover, the sol–gel powders of TBT/EG, TBT/EG/Ag (10−2 M), TBT/isop, and TBT/isop/Ag (10−2 M) demonstrated the ability to retain their photocatalytic activity even after three cycles of use, suggesting that they could find practical use in the treatment of pharmaceutical wastewater. The observed photocatalytic efficiency and positive impact of silver make the prepared powders a desirable choice for pharmaceutical drug degradation, helping to promote environmentally friendly and effective wastewater treatment technology.

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Section: Photocatalytic Efficiency Of Pure and Silver-photofixed Sol-...mentioning

confidence: 99%

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confidence: 99%

The Solvent Role for the Decomposition of Paracetamol in Distilled and Drinking Water by Pure and Ag-Modified TiO2 Sol–Gel Powders

Bachvarova-Nedelcheva,

Iordanova,

Kaneva

2024

Materials

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“…Nevertheless, band-gap tuning is crucial in order to obtain materials that are active under visible light instead of UV. Several authors modified the surface of common titanium oxide by forming heterojunctions between two different phases [232] or by adding metal doping [233][234][235]. Li et al [236] rethought the band gap approach by modifying the BC structure instead of inserting nitrogen defects in order to improve electron mobility and to more efficiently disperse titanium oxide particles.…”

Section: Photochemical Based Bc Catalytic Systemsmentioning

confidence: 99%

A Comprehensive Overview on Biochar-Based Materials for Catalytic Applications

Bartoli,

Giorcelli,

Tagliaferro

2023

Catalysts

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The development of heterogeneous catalysts is one of the pillars of modern material science. Among all supports, carbonaceous ones are the most popular due to their high surface area, limited cost, and tunable properties. Nevertheless, materials such as carbon black are produced from oil-derived sources lacking in sustainability. Pyrolytic carbon produced from biomass, known as biochar, could represent a valid solution to combine the sustainability and performance of supported catalysts. In this review, we report a comprehensive overview of the most cutting-edge applications of biochar-based catalysts, providing a reference point for both experts and newcomers. This review will provide a description of all possible applications of biochar-based catalysts, proving their sustainability for the widest range of processes.

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“…This low concentration improves titanium's photocatalytic performance without changing the surface properties or crystalline structure. Due to its high chemical stability and reactivity in the field of heterogeneous photocatalysis, Ag is a preferred material [5][6][7][8]. Ag is photodeposited on semiconductor surfaces for a variety of photocatalytic processes for degradation of organic pollutants [8][9][10][11].…”

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confidence: 99%

Photo-fixation of Ag onto TiO2 Powder Films for Improved Photocatalytic Activity and Atomic-absorption Determination of Residual Noble Metal in Dyes Solution

Ivanova,

Mladenova,

Kaneva

2024

C. R. Acad. Bulg. Sci.

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For the first time, we photo-fixed silver ions (10–2, 10–3, and 10–4 M) onto films prepared from commercial TiO2 powder via ultraviolet illumination. The synthesis process is straightforward and environmentally friendly. The nanostructures are characterized by SEM, XRD, FAAS, and UV/Vis spectroscopy for the photocatalytic properties. The X-ray diffraction pattern demonstrated the phase of the anatase TiO2 structure. Flame Atomic Absorption Spectrometry is used as a simple way to determine the Ag+ content in solutions from the heterogeneous photocatalysis under UV illumination. The research shows that at the end of the degradation process, no silver ions are observed for both dyes – malachite green and methylene blue. The formation of stable intermediates by the reaction of OH with the triarylmethane dye during the photocatalysis resulted in faster degradation of malachite green than methylene blue. In comparison to pure TiO2, the TiO2/Ag films have higher photocatalytic efficiency. The reason is the presence of silver, which leads to a decrease in the recombination of pairs of charges.

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Photocatalytic and bactericidal behaviors of Ag/TiO2 doped biochar through Ball–milling approach

Cited by 7 publications

References 42 publications

The Solvent Role for the Decomposition of Paracetamol in Distilled and Drinking Water by Pure and Ag-Modified TiO2 Sol–Gel Powders

The Solvent Role for the Decomposition of Paracetamol in Distilled and Drinking Water by Pure and Ag-Modified TiO2 Sol–Gel Powders

A Comprehensive Overview on Biochar-Based Materials for Catalytic Applications

Photo-fixation of Ag onto TiO2 Powder Films for Improved Photocatalytic Activity and Atomic-absorption Determination of Residual Noble Metal in Dyes Solution

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