Spray-dried microporous Pt/TiO2 degrades 4-chlorophenol under UV and visible light

Khan, Hizbullah; Usen, Ndifreke; Boffito, Daria C.

doi:10.1016/j.jece.2019.103267

Cited by 21 publications

(5 citation statements)

References 59 publications

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“…The order of the PL intensity for MIL-53(Al)/ZnO, ZnO, and MIL-53Al was ZnO > MIL-53Al > MIL-53(Al)/ZnO. The lower PL intensity of MIL-53(Al)/ZnO indicates improved separation of electrons and holes (Khan et al 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Effective photocatalytic degradation of amoxicillin using MIL-53(Al)/ZnO composite

Fawzy

Mahanna

Mossad

2022

Environ Sci Pollut Res

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A promising hierarchical nanocomposite of MIL-53(Al)/ZnO was synthesized as a visible-light-driven photocatalyst to investigate the degradation of amoxicillin (AMX). MIL-53(Al)/ZnO ultrafine nanoparticles were obtained by preparing Zn-free MIL-53Al and employing it as a reactive template under hydrothermal and chemical conditions. The synthesized nanocomposite (MIL-53(Al)/ZnO) has a low content of Al > 1.5% with significantly different characterizations of the parent compounds elucidated by various analyses such as SEM, TEM, XRD, EDX, and UV–Vis. The effect of operational parameters (catalyst dose (0.2–1.0 g/L), solution pH (3–11), and initial AMX concentration (10–90 mg/L)) on the AMX removal efficiency was studied and optimized by the response surface methodology. A reasonable goodness-of-fit between the expected and experimental values was confirmed with correlation coefficient (R2) equal to 0.96. Under the optimal values, i.e., initial AMX concentration = 10 mg/L, solution pH ~ 4.5, and catalyst dose = 1.0 g/L, 100% AMX removal was achieved after reaction time = 60 min. The degradation mechanism and oxidation pathway were vigorously examined. The AMX degradation ratios slightly decreased after five consecutive cycles (from 78.19 to 62.05%), revealing the high reusability of MIL-53(Al)/ZnO. The AMX removal ratio was improved with enhancers in order ($${\mathrm{IO}}_{4}^{-}$$ IO 4 - > H2O2 > S2O8−2). The results proved that 94.12 and 98.23% reduction of COD were obtained after 60 and 75 min, respectively. The amortization and operating costs were estimated at 3.3 $/m3 for a large-scale photocatalytic system.

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Section: Resultsmentioning

confidence: 99%

Effective photocatalytic degradation of amoxicillin using MIL-53(Al)/ZnO composite

Fawzy

Mahanna

Mossad

2022

Environ Sci Pollut Res

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“…P-25 titanium dioxide fine particles have often been administered in the form of slurry. When the titanium dioxide catalyst is suspended, this is usually linked to the high volumetric production rate of oxidant species, which is relevant to the area of active sites (Khan et al 2019). Catalyst attachment into a large inert substrate, on the other hand, limits the number of catalyst active sites and increases mass transfer constraints.…”

Section: Catalyst Immobilizationmentioning

confidence: 99%

Solar photo-oxidation of recalcitrant industrial wastewater: a review

et al. 2022

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Conventional methods to clean wastewater actually lead to incomplete treatments, calling for advanced technologies to degrade recalcitrant pollutants. Herein we review solar photo-oxidation to degrade the recalcitrant contaminants in industrial wastewater, with focus on photocatalysts, reactor design and the photo-Fenton process. We discuss limitations due to low visible-light absorption, catalyst collection and reusability, and production of toxic by-products. Photodegradation of refractory organics by solar light is controlled by pH, photocatalyst composition and bandgap, pollutant properties and concentration, irradiation type and intensity, catalyst loading, and the water matrix.

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“…However, limitations for the practical application of TiO2 are the fast recombination rate of the photo-excited electron-hole and the wide band gap of TiO2. Those limitations can be addressed by the heterojunction of semiconductor materials with different band gaps [7] or loading/doping with noble metals [8], respectively. Suppression of the electron-hole recombination has been achieved by the heterojunctions between TiO2 and other different band gap-semiconductors to improve charge separation and prolong the lifetime of charge carriers, e.g., TiO2 (n-type semiconductor) and BiOI (p-type semiconductor).…”

Section: Cho O Hco H Co Hcoohmentioning

confidence: 99%

Gas Phase Oxidation of Formaldehyde by Tio2/Tio2-V2o5/Polypyrrole Energy Storage Photocatalyst

Meeyoo

Piewnuan²,

Wootthikanokkhan³

et al. 2022

AEJ

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Photocatalytic oxidation of formaldehyde was performed through an electron storage photocatalyst named TiO2/TiO2-V2O5/PPy nanocomposites, consisting of TiO2 responsible for an electron generating source, TiO2-V2O5 functional as an electron storage substance, and PPy (polypyrrole) as an electron conducting substance between the formers. It was found that the TiO2/TiO2-V2O5/PPy nanocomposites showed both adsorption and photocatalytic activity for formaldehyde removal. Under UV irradiation, the catalytic activity of the TiO2/TiO2-V2O5/PPy catalyst was 57%, which was 0.1 and 0.4 times higher than that of TiO2 and TiO2/PPy catalysts, respectively. Moreover, the TiO2/TiO2-V2O5/PPy catalyst retained its function for at least 3 hours, after UV irradiation for 3.5 hours. The presence of TiO2-V2O5 was found to enhance the photocatalytic activity of the TiO2 catalyst, including the ability to function in the absence of UV light. This is due to the lower energy band gap of the TiO2/TiO2-V2O5/PPy, compared to that of TiO2; the TiO2-V2O5 also possesses energy storage ability. Further, the reaction rate of photocatalytic oxidation of formaldehyde by the electron storage photocatalyst was determined. The formaldehyde destruction rate is a function of formaldehyde concentration and can be formulated using a simplified Langmuir-Hinshelwood.

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Spray-dried microporous Pt/TiO2 degrades 4-chlorophenol under UV and visible light

Cited by 21 publications

References 59 publications

Effective photocatalytic degradation of amoxicillin using MIL-53(Al)/ZnO composite

Effective photocatalytic degradation of amoxicillin using MIL-53(Al)/ZnO composite

Solar photo-oxidation of recalcitrant industrial wastewater: a review

Gas Phase Oxidation of Formaldehyde by Tio2/Tio2-V2o5/Polypyrrole Energy Storage Photocatalyst

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