Crystalline ZnO Photocatalysts Prepared at Ambient Temperature: Influence of Morphology on p-Nitrophenol Degradation in Water

Mahy, Julien G.; Lejeune, Louise; Haynes, Tommy; Body, Nathalie; Kreijger, Simon De; Elias, Benjamin; Marcilli, Raphael Henrique Marques; Fustin, Charles‐André; Hermans, Sophie

doi:10.3390/catal11101182

Cited by 18 publications

(8 citation statements)

References 32 publications

(58 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ZnO photocatalyst shows diffraction peaks at 2θ that are equal to 31.91 • , 34.56 • , 36.36 • , and 47.62 • , corresponding to the (1 0 0), (0 0 2), (1 0 1), and (1 0 2) crystalline planes, respectively, which are associated with the wurtzite hexagonal crystal structure [46]. The X-ray diffraction studies underline the fact that the combination of a commercial or SAS-micronized ZnO photocatalyst with commercial β-CD or β-CD precipitated by SAS in the hybrid materials does not cause any modification to the crystalline structure because the typical signals of the wurtzite phase are evident, which is in agreement with the reported JCPDS data [46,47]. No characteristic peaks were observed other than ZnO, confirming that the main crystalline phase is wurtzite without detecting the appearance of other diffraction peaks correlated to β-CD [48].…”

Section: Wide Angle X-ray Diffraction (Waxd)supporting

confidence: 86%

Photocatalytic Systems Based on ZnO Produced by Supercritical Antisolvent for Ceftriaxone Degradation

Mottola,

Mancuso,

Sacco

et al. 2023

Catalysts

View full text Add to dashboard Cite

Emerging contaminants are a significant issue in the environment. Photocatalysis is proposed as a solution for the degradation of pollutants contained in wastewater. In this work, ZnO-based photocatalysts have been produced and tested for the photocatalytic degradation of an antibiotic; specifically, ceftriaxone has been used as a model contaminant. Moreover, there is particular interest in combining small-size ZnO particles and β-cyclodextrin (β-CD), creating a hybrid photocatalyst. Zinc acetate (ZnAc) (subsequently calcinated into ZnO) and β-CD particles with a mean diameter of 0.086 and 0.38 µm, respectively, were obtained using the supercritical antisolvent process (SAS). The produced photocatalysts include combinations of commercial and micronized particles of ZnO and β-CD and commercial and micronized ZnO. All the samples were characterized through UV–Vis diffuse reflectance spectroscopy (DRS), and the band gap values were calculated. Raman and FT-IR measurements confirmed the presence of ZnO and the existence of functional groups due to the β-cyclodextrin and ZnO combination in the hybrid photocatalysts. Wide-angle X-ray diffraction patterns proved that wurtzite is the main crystalline phase for all hybrid photocatalytic systems. In the photocatalytic degradation tests, it was observed that all the photocatalytic systems exhibited 100% removal efficiency within a few minutes. However, the commercial ZnO/micronized β-CD hybrid system is the photocatalyst that shows the best performance; in fact, when using this hybrid system, ceftriaxone was entirely degraded in 1 min.

show abstract

Section: Wide Angle X-ray Diffraction (Waxd)supporting

confidence: 86%

Photocatalytic Systems Based on ZnO Produced by Supercritical Antisolvent for Ceftriaxone Degradation

Mottola,

Mancuso,

Sacco

et al. 2023

Catalysts

View full text Add to dashboard Cite

show abstract

“…Clay/ZnO/Cu 2+ is the most efficient material, with PNP degradation of 92%. The pure TiO 2 and ZnO materials reached 100% PNP degradation, as observed in previous studies [18,19].…”

Section: Photocatalytic Activitysupporting

confidence: 86%

“…For the same amount of semiconductor material (TiO 2 or ZnO), the ZnO-modified clay is more efficient than the TiO 2 -modified one. As previously observed [18,31], ZnO materials have better activity than TiO 2 , due to fewer recombinations of photogenerated species. The addition of Cu 2+ ions increases the photoactivity due to an additional photo-Fenton effect that improves the PNP degradation [32].…”

Section: Photocatalytic Activitysupporting

confidence: 72%

“…This process is based on the generation of radical species able to degrade organic pollutants thanks to the use of a photocatalyst material activated by UV radiation [16]. The most-used UV-sensitive photocatalysts are TiO 2 and ZnO [17][18][19]. Different composites of photocatalysts have already been developed for pollutant removal [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Natural Clay Modified with ZnO/TiO2 to Enhance Pollutant Removal from Water

et al. 2022

Self Cite

View full text Add to dashboard Cite

Raw clays, extracted from Bana, west Cameroon, were modified with semiconductors (TiO2 and ZnO) in order to improve their depollution properties with the addition of photocatalytic properties. Cu2+ ions were also added to the clay by ionic exchange to increase the specific surface area. This insertion of Cu was confirmed by ICP-AES. The presence of TiO2 and ZnO was confirmed by the detection of anatase and wurzite, respectively, using X-ray diffraction. The composite clays showed increased specific surface areas. The adsorption property of the raw clays was evaluated on two pollutants, i.e., fluorescein (FL) and p-nitrophenol (PNP). The experiments showed that the raw clays can adsorb FL but are not efficient for PNP. To demonstrate the photocatalytic property given by the added semiconductors, photocatalytic experiments were performed under UVA light on PNP. These experiments showed degradation up to 90% after 8 h of exposure with the best ZnO-modified clay. The proposed treatment of raw clays seems promising to treat pollutants, especially in developing countries.

show abstract

“…Such factors include, but are not limited to, encroaching moisture, oxygen, light, and thermal operating conditions. In photovoltaic applications, the presence of moisture, for instance, poses the most rapid degradation of the device [25]. Also, device operating temperatures of 50 • C are expected in commercial solar cell modules, but can easily exceed 85 • C. Such conditions further compromise the integrity of the device.…”

Section: Challenges and Future Directions Of Zno-based Pscsmentioning

confidence: 99%

Influence of ZnO Nanostructure Morphologies on Perovskite Solar Cell Performance: A Review

Manabeng¹,

Mwankemwa²,

Ocaya³

et al. 2022

Preprint

View full text Add to dashboard Cite

Zinc oxide (ZnO) has been widely studied over the last decade for its remarkable properties in optoelectronic and photovoltaic devices because of its high electron mobility and excitonic properties, probably the broadest range of nanostructured forms, and their ease and low cost of synthesis by a wide variety of methods. The volume of recent work on ZnO nanostructures and their devices can potentially overshadow significant developments in the field. Therefore, there is a need for a concise description of the most recent advances in the field. In this review, we focus on the effect of ZnO nanostructure morphologies on the performance of ZnO-based solar cells sensitized using methylammonium lead iodide perovskite. We present an exhaustive discussion of the synthesis routes for different ZnO nanostructure morphologies, ways to control the morphology, and the impact of morphology on the photo-conversion efficiency of a given PSC.

show abstract

Crystalline ZnO Photocatalysts Prepared at Ambient Temperature: Influence of Morphology on p-Nitrophenol Degradation in Water

Cited by 18 publications

References 32 publications

Photocatalytic Systems Based on ZnO Produced by Supercritical Antisolvent for Ceftriaxone Degradation

Photocatalytic Systems Based on ZnO Produced by Supercritical Antisolvent for Ceftriaxone Degradation

Natural Clay Modified with ZnO/TiO2 to Enhance Pollutant Removal from Water

Influence of ZnO Nanostructure Morphologies on Perovskite Solar Cell Performance: A Review

Contact Info

Product

Resources

About