ZnO/CeO2 nanocomposite with low photocatalytic activity as efficient UV filters

Mueen, Rafid Abdlateef; Morlando, Alexander; Qutaish, Hamzeh; Lerch, Michael L. F; Cheng, Zhenxiang; Konstantinov, Konstantin

doi:10.1007/s10853-020-04493-x

Cited by 35 publications

(11 citation statements)

References 68 publications

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“…For CeO2, some low-intensity peaks were also present in the area of 1700-1300 cm −1 (Figure 4b). Based on what can be seen in the literature, these bands were related to OH group (1630 cm −1 ) (Figure 4b) stretching vibrations, which were associated with the residual water molecules or physically adsorbed OH groups on the surfaces of the CeO2 [32]. Another explanation is that these bands (1295, 1386, 1471, and 1587 cm −1 ) were attributed to the surface adsorbed carbonates [33], arising out of the synthetic procedure of the particles.…”

Section: Spectroscopic Characterizationsupporting

confidence: 53%

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

et al. 2021

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The monolithic materials of reduced graphene oxide (rGO) can be used successfully in CO2 adsorption. Here, the incorporation of CeO2 particles with and without polymer brushes grafted from the particles showed that the structural properties could be changed, affecting the adsorption of CO2. Polymer brushes of (1) poly(acrylic acid) (PAA), (2) poly(vinyl caprolactam) (PVCL) and (3) poly[(2-(methacryloyloxy)ethyl) trimethylammonium chloride] (PMETAC) were grafted from CeO2 via reversible addition−fragmentation chain transfer (RAFT) polymerization. The preparation of monoliths of rGO with different modified CeO2 particles led to different thermal properties (TGA), structural changes (BET isotherms) and CO2 adsorption. The responsive character of the CeO2@polymer was proven by the DLS and UV results. The responsive character of the particles incorporated into the rGO monolith affected not only the adsorption capacity but also the microstructure and values of the surface volume of the pores of the monolith. Monoliths with porosity values for better adsorption were affected by the responsive character of the polymer.

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Section: Spectroscopic Characterizationsupporting

confidence: 53%

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

et al. 2021

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“…The authors claimed that the decrease in activity of CeO 2 /TiO 2 nanocomposites may have resulted from scavenging of reactive oxygen species by ceria species, increased recombination of photo-excited charge carriers caused by ceria doping and/or UV shielding effects from ceria loading on the surface of TiO 2 . Deactivation of photocatalysts after loading of ceria was also observed for CeO 2 /ZnO heterostructures . According to the authors, deactivation of this catalytic system arose from the presence of ultrafine CeO 2 nanoparticles with existing surface defects, which could impart some form of reactive oxygen species scavenging property.…”

Section: Introductionmentioning

confidence: 95%

“…Deactivation of photocatalysts after loading of ceria was also observed for CeO 2 /ZnO heterostructures. 12 According to the authors, deactivation of this catalytic system arose from the presence of ultrafine CeO 2 nanoparticles with existing surface defects, which could impart some form of reactive oxygen species scavenging property. However, no evidence supporting the above-mentioned hypotheses, explaining deactivation of TiO 2 or ZnO photocatalysts after loading of ceria species, has been provided.…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

et al. 2021

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The study provides deep insight into the origin of photocatalytic deactivation of Nb 2 O 5 after modification with ceria. Of particular interest was to fully understand the role of ceria species in diminishing the photocatalytic performance of CeO 2 /Nb 2 O 5 heterostructures. For this purpose, ceria was loaded on niobia surfaces by wet impregnation. The as-prepared materials were characterized by powder X-ray diffraction, nitrogen physisorption, UV–visible spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and photoluminescence measurements. Photocatalytic activity of parent metal oxides (i.e., Nb 2 O 5 and CeO 2 ) and as-prepared CeO 2 /Nb 2 O 5 heterostructures with different ceria loadings were tested in methanol photooxidation, a model gas-phase reaction. Deep insight into the photocatalytic process provided by operando -IR techniques combined with results of photoluminescence studies revealed that deactivation of CeO 2 /Nb 2 O 5 heterostructures resulted from increased recombination of photo-excited electrons and holes. The main factor contributing to more efficient recombination of the charge carriers in the heterostructures was the ultrafine size of the ceria species. The presence of such highly dispersed ceria species on the niobia surface provided a strong interface between these two semiconductors, enabling efficient charge transfer from Nb 2 O 5 to CeO 2 . However, the ceria species supported on niobia exhibited a high defect site concentration, which acted as highly active recombination centers for the photo-induced charge carriers.

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“…Extensive exposure to UV light can cause detrimental effects such as erythema (sunburn), premature skin ageing, skin wrinkles, cornea, actinic keratosis, solar elastosis, and liver spots [1,2]. UV radiation is a part of electromagnetic spectrum, and divided into UVA (400-315 nm), UVB ((315-280) and UVC (280-100 nm) categories [2,3]. UVC do not reach the earth surface as it is blocked by ozone layer.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Nanoarchitectonics of (110) directed polyethylene glycol stabilized cerium nanoparticles for UV filtering applications

et al. 2022

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The use of zinc oxide (ZnO) and titanium oxide (TiO2) nanoparticles in ultraviolet (UV) filters can cause serious health issues due to their genotoxicity and cytotoxicity effect. Recent research on cerium oxide (CeO2) nanoparticles has demonstrated their biocompatible nature, excellent antioxidant and ultraviolet–visible (UV–Vis) absorption properties. CeO2-based nanocomposite materials or nano-architectures can offer uniform absorptive properties, therapeutic skin effect and easy skin application. In this study, cerium oxide-polyethylene glycol (CeO2-PEG) nano-architecture was prepared by hydrothermal processing with the aim to improve stability, antioxidant properties, and enhance UV absorption for UV filtering applications. The morphology study of the developed nanocomposite revealed the formation of polymer bands with well-dispersed CeO2 nanoparticles. The nanocomposite structure has exhibited excellent UV absorption in the UV range 200–400 nm due to decrease in optical band gap in comparison to the naked CeO2 NPs. The evaluation of the photocatalytic activity (PCA) of the nanocomposite structure against P25 photocatalyst and ZnO nanoparticles showed no dye (crystal violet) degradation on UV irradiation. Hence, PCA assay verified the absence of ROS generation and increased stability of the nanostructure under UV irradiation. The investigation of antioxidant properties of the Ce-PEG nanocomposite by a dichlorofluorescein (DCF)-based assay revealed sufficient intracellular ROS scavenging in comparison to N-acetylcysteine (NAC) and H2O2 only assays. In vitro toxicity evaluation of Ce-PEG nanocomposite towards non-malignant human keratinocyte cell line (HaCaT) revealed a non-significant cell mortality ~ 10% of control at a dosage of 50 mg L−1. The nanocomposite structure also exhibited excellent UV protection for HaCaT cells under UV irradiation conditions compared to P25. Our findings suggest that the developed nanocomposite combined the antioxidant and UV absorption properties of CeO2 and skin emollient role of (PEG), and hence offered a novel biocompatible and multifunctional structure for sunscreens and therapeutic skin product. Graphical abstract

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ZnO/CeO2 nanocomposite with low photocatalytic activity as efficient UV filters

Cited by 35 publications

References 68 publications

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Nanoarchitectonics of (110) directed polyethylene glycol stabilized cerium nanoparticles for UV filtering applications

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ZnO/CeO2 nanocomposite with low photocatalytic activity as efficient UV filters

Cited by 35 publications

References 68 publications

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

Unraveling the Origin of Photocatalytic Deactivation in CeO2/Nb2O5 Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Nanoarchitectonics of (110) directed polyethylene glycol stabilized cerium nanoparticles for UV filtering applications

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Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species