Enhanced sunlight photocatalytic activity and biosafety of marine-driven synthesized cerium oxide nanoparticles

Abstract

This contribution presents the biosynthesis, physiochemical properties, toxicity and photocatalytic activity of biogenic CeO2 NPs using, for the first time, marine oyster extract as an effective and rich source of bioreducing and capping/stabilizing agents in a one-pot recipe. CeO2 NPs formation was initially confirmed through the color change from light green to pale yellow and subsequently, their corresponding absorption peak was spectroscopically determined at 310 nm with an optical band-gap of 4.67 eV using the DR-UV technique. Further, XRD and Raman analyses indicated that nanoceria possessed face-centered cubic arrangements without any impurities, having an average crystallite size of 10 nm. TEM and SEM results revealed that biogenic CeO2 NPs was approximately spherical in shape with a median particle size of 15 ± 1 nm. The presence of various bioorganic substances on the surface of nanoparticles was deduced by FTIR and TGA results. It is found that marine-based nanoceria shows no cytotoxic effect on the normal cell, thus indicating their enhanced biocompatibility and biosafety to living organisms. Environmentally, due to energy band gap, visible light-activated CeO2 nanocatalyst revealed superior photocatalytic performance on degradation of methylene blue pollutant with removal rate of 99%. Owing to the simplicity, cost-effectiveness, and environmentally friendly nature, this novel marine biosynthetic route paves the way for prospective applications of nanoparticles in various areas.

Graphene nanoplatelets/CeO2 nanotiles nanocomposites as effective antibacterial material for multiple drug-resistant bacteria

“…The bandgap energies so obtained are 4.14 eV (for CeO 2 ), 3.86 eV (for G/CeO 2 -I) and 3.80 eV (for G/CeO 2 -II). The observed bandgap of CeO 2 is slightly higher than the reported values for bulk CeO 2 , but it agrees well with a study where 4.65 eV bandgap has been reported for CeO 2 nanoparticles (Safat et al 2021 ). The quantum size effects that occur in materials with nanoscale dimension lead to an increase in bandgap energies, observed in this case (Srdanov et al 1994 ).…”

Bifunctional CePO4/CeO2 nanocomposite as a promising heterogeneous catalyst for the enhancement of the ozonation recovery effect in the presence of chloride ions

“…1 B, the IR spectrum of the parent CeO 2 revealed the presence of broad absorption bands at ca. 555 and 473 cm ‒1 , which are characteristic of Ce‒O stretching vibrations in the structure of CeO 2 14 . The vibrational bands mentioned above were not identified for the parent CePO 4 for which the most intense IR bands were found at ca.…”

Green Fabrication of Zinc Oxide Nanoparticles Using Phlomis Leaf Extract: Characterization and In Vitro Evaluation of Cytotoxicity and Antibacterial Properties

“…Traditional chemical and physical procedures may now produce large quantities of metal nanoparticles in a short time; however, these techniques result in the presence of some toxic chemicals adsorbed on the surface, which could have negative consequences in medical applications [4,5]. The development and discovery of novel nontoxic, environmentally friendly methods for the synthesis of metal nanoparticles, such as plants and bioactive elements found in plants, has garnered considerable attention due to their superior reducing ability and antimicrobial properties, as well as the physicochemical features of green NP synthesis; this technique also has the added benefit of increasing the life span of NPs, which overcomes the limits of traditional chemical and physical NP synthesis methods [6][7][8]. Metal oxide nanoparticles have generated considerable attention in biomedical technology due to their enormous surface area and are widely used in industrial and therapeutic applications [9][10][11].…”