Facile synthesis of mesoporous black N–TiO2 photocatalyst for efficient charge separation and the visible-driven photocatalytic mechanism of ibuprofen degradation

Sarafraz, Mansour; Amini, Mostafa M.; Adiban, Moayed; Eslami, Akbar

doi:10.1016/j.mssp.2020.105258

Cited by 37 publications

(7 citation statements)

References 48 publications

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“…The study consisted of increasing the catalyst concentration from 0.1 to 0.4 g L À1 reflecting an increase in pollutant degradation from 57% to 96% respectively. However, by increasing the concentration of catalyst to 0.5 g L À1 , the percentage of reduction decreased to approximately 90%, this fact being explained by the authors as an increase in the turbidity of the solution caused by the high amount of catalyst, causing a decrease in the absorption of light and, consequently, decrease in the efficiency of degradation (Sarafraz et al 2020). Wetchakun et al (2019) explains this phenomenon as a light screening effect, explaining that there is an optimum point regarding the concentration of catalysts in the reaction.…”

Section: Effect Of Catalyst Concentrationmentioning

confidence: 95%

“…The oxidation efficiency of IBP decreased with increasing initial pollutant concentration. The authors explained that the IBP can be adsorbed on the surface of the catalyst, blocking the active sites on the A study performed by Sarafraz et al (2020) also evaluated the effect of the initial IBP concentration. The authors realized that by increasing the concentration from 2 to 10 mg L À1 the degradation reduced from 96% to 75%, respectively.…”

Section: Influence Of the Initial Ibuprofen Concentrationmentioning

confidence: 99%

“…The authors suggested that the increasing in the initial pollutant concentration increases the adsorption of IBP on the catalyst surface, leading to a decrease in the number of available active sites, which prevents O 2 and OH À from being adsorbed on the catalyst surface, reducing the generation of oxidizing species, thus decreasing the rate of degradation. In addition, the authors also explained that by increasing the initial concentration of pollutant, the amount of intermediates formed also increases, competing with the IBP molecules for active sites, in addition to consuming the oxidizing species, also impairing the degradation of the IBP (Sarafraz et al 2020). Considering that faster reactions save time and energy, for the following tests the initial concentration of 10 ppm of Ibuprofen was used.…”

Section: Influence Of the Initial Ibuprofen Concentrationmentioning

confidence: 99%

“…In the case of catalysts containing 10 and 15% of CoFe 2 O 4 , the increase in the catalyst concentration came to harm the process, reducing the percentage of IBP removal. Sarafraz et al (2020) also studied the effect of the concentration of catalyst in the reaction medium. The researchers stated that by increasing the amount of catalyst in the medium, it increases the surface area that absorbs light and, consequently, increases the active sites available in the catalyst.…”

Section: Effect Of Catalyst Concentrationmentioning

confidence: 99%

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Functioned catalysts with magnetic core applied in ibuprofen degradation

Lenzi

Lopes

Andrade

et al. 2021

Water Science and Technology

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In the present work, the performance of Ag/ZnO/CoFe2O4 magnetic photocatalysts in the photocatalytic degradation of Ibuprofen (IBP) was evaluated. This study considered the use of pure Ag/ZnO (5% Ag) and also use the Ag/ZnO/CoFe2O4 magnetic catalysts containing different amounts (5, 10 and 15% wt) of cobalt ferrite (CoFe2O4). The catalysts were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and photoacoustic Spectroscopy. To carried the photocatalytic degradation reaction, different concentrations of the ibuprofen contaminant solution (10, 20 and 30 ppm) and different concentrations of photocatalyst were tested (0.3 gL−1, 0.5 gL−1 and 1.0 gL−1). The reaction parameters studied were: IBP concentration, catalyst concentration, adsorption and photolysis, influence of the matrix, radiation source (solar and artificial) and the effect of organic additive. At the end of the photocatalytic tests, the best operation conditions were defined. Considering the obtained results of degradation efficiency and magnetic separation, the optimal parameters selected to proceed with the other tests of the study were: ibuprofen solution concentration 10 ppm, Ag/ZnO/CoFe2O4(5%) catalyst at a concentration of 0.3 g L−1 and pH 4.5 of the reaction medium. The results indicated the feasibility of magnetic separation of the synthesized catalysts. A long duration test indicated that the catalyst exhibits stability throughout the degradation reaction, as more than 80% of ibuprofen was degraded after 300 minutes. The photocatalytic activity was directly affected by the ferrite load. The higher the nominal load of ferrite, the lower the performance in ibuprofen degrading. It was also observed that the smallest amount of ferrite studied was enough for the catalyst to be recovered and reused. The adsorption and photolysis tests did not show significant results in the IBP degradation. In addition, it was possible to verify that the aqueous matrix, the use of solar radiation and the addition of additive (acid formic) interfered direct in the process. The catalyst reuse tests indicated that it can be recovered and reused at least three times without considerable catalytic activity loss.

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Section: Effect Of Catalyst Concentrationmentioning

confidence: 95%

Section: Influence Of the Initial Ibuprofen Concentrationmentioning

confidence: 99%

Section: Influence Of the Initial Ibuprofen Concentrationmentioning

confidence: 99%

Section: Effect Of Catalyst Concentrationmentioning

confidence: 99%

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Functioned catalysts with magnetic core applied in ibuprofen degradation

Lenzi

Lopes

Andrade

et al. 2021

Water Science and Technology

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“…There are several methods for removing ibuprofen, including the use of the adsorption process, activated carbon, microbial bio lters, membranes-based biological or physical processes, and advanced oxidation processes (Kang et al 2014). Heterogeneous photocatalytic process is one of the most important studied methods; this method has several advantages including environmental protection, energy conservation, and cost-effectiveness (Sarafraz et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Removal of ibuprofen from synthetic wastewater using photocatalytic method in the presence of FeO photocatalyst supported on modified Iranian clinoptilolite

Mohadesi

Gouran

Seifi

2022

Environ Sci Pollut Res

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This study investigated the removal of an organic drug called ibuprofen from the wastewater containing this drug. Iron oxide supported on modi ed Iranian clinoptilolite was used as the photocatalyst in the presence of the light of a solar lamp. XRD, SEM, EDAX and FT-IR analyses were performed to detect the prepared photocatalyst. The results of photocatalytic identi cation analyses proved the suitable loading of iron oxide supported on modi ed Iranian clinoptilolite. This study investigated the effect of initial concentration of ibuprofen (5-25 mg/L), photocatalyst concentration (100-300 mg/L), and process time (10-240 min) on the removal from ibuprofen from wastewater containing this drug. The experiments were performed in a setup in the presence of a solar lamp with a ux of 300 W/m 2 . The results indicated that with the initial ibuprofen concentration of 25 mg/L, photocatalyst concentration of 300 mg/L, and time of 210 min, the highest percentage of ibuprofen removal was 99.80%. Kinetic modeling was then performed using the Langmuir-Hinshelwood model, and a quasi-rst-order kinetic model showed a good agreement with the results obtained. Finally, the recovery of the photocatalyst was investigated and the results showed that under optimal conditions about 91% of ibuprofen was removed after ve re-uses of the photocatalyst.

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Surface Defect Engineering in Colored TiO₂ Hollow Spheres Toward Efficient Photocatalysis

Liccardo

Bordin

Sheverdyaeva

et al. 2023

Adv Funct Materials

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Nanostructured TiO 2 is one of the best materials for photocatalysis, thanks to its high surface area and surface reactivity, but its large energy bandgap (3.2 eV) hinders the use of the entire solar spectrum. Here, it is proposed that defect-engineered nanostructured TiO 2 photocatalysts are obtained by hydrogenation strategy to extend its light absorption up to the near-infrared region. It is demonstrated that hydrogenated or colored TiO 2 hollow spheres (THS) composed of hierarchically assembled nanoparticles result in much broader exploitation of the solar spectrum (up to 1200 nm) and the engineered surface enhances the photogeneration of charges for photocatalytic processes. In turn, when applied for photodegradation of a targeted drug (Ciprofloxacin) this results in 82% degradation after 6 h under simulated sunlight. Valence band analysis by photoelectron spectroscopy revealed the presence of oxygen vacancies, whose surface density increases with the hydrogenation rate. Thus, a tight correlation between degree of hydrogenation and photocatalytic activity is directly established. Further insight comes from electron paramagnetic resonance, which evidences bulk Ti 3+ centers only in hydrogenated THS. The results are anticipated to disclose a new path toward highly efficient photocatalytic titania in a series of applications targeting water remediation and solar fuel production.

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Facile synthesis of mesoporous black N–TiO2 photocatalyst for efficient charge separation and the visible-driven photocatalytic mechanism of ibuprofen degradation

Cited by 37 publications

References 48 publications

Functioned catalysts with magnetic core applied in ibuprofen degradation

Functioned catalysts with magnetic core applied in ibuprofen degradation

Removal of ibuprofen from synthetic wastewater using photocatalytic method in the presence of FeO photocatalyst supported on modified Iranian clinoptilolite

Surface Defect Engineering in Colored TiO₂ Hollow Spheres Toward Efficient Photocatalysis

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Facile synthesis of mesoporous black N–TiO2 photocatalyst for efficient charge separation and the visible-driven photocatalytic mechanism of ibuprofen degradation

Cited by 37 publications

References 48 publications

Functioned catalysts with magnetic core applied in ibuprofen degradation

Functioned catalysts with magnetic core applied in ibuprofen degradation

Removal of ibuprofen from synthetic wastewater using photocatalytic method in the presence of FeO photocatalyst supported on modified Iranian clinoptilolite

Surface Defect Engineering in Colored TiO2 Hollow Spheres Toward Efficient Photocatalysis

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Surface Defect Engineering in Colored TiO₂ Hollow Spheres Toward Efficient Photocatalysis