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

Somayeh Safat,Soheila Matroodi,Salim Albukhaty,Foad Buazar

doi:10.1038/s41598-021-94327-w

Somayeh Safat, Soheila Matroodi + Show 2 more

Open Access

https://doi.org/10.1038/s41598-021-94327-w

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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.

Highlights

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
In the presence of electron-donor marine-derived biomolecules the metallic cations in aqueous salt solution were reduced into corresponding nanoceria in a benign and nontoxic reaction condition
XRD, TEM, and SEM results confirmed the cubic fluorite structure of biogenic CeO2 NPs without any impurities with a mean particle size of 15 ± 1 nm distributed in homogenous fashion

Summary

Introduction

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. The notion “biogenic” refers to a variety of biosynthetic pathways based on flora and fauna extracts These natural resources include sea cucumber3, algae4,5, plants[6,7], bacteria, yeast and fungi microorganisms among others[8]. Cerium oxide nanoparticles ( CeO2 NPs, nanoceria) have been received momentous interest owing to their inimitable physiochemical properties, biocompatibility, and b ioactivities[14,15] They were broadly exploited in various fields such as therapeutics agents in acute kidney injury[16], catalysis, drug delivery careers, and environmental pollution scavenger[17]. The promoted biological properties of nanoceria are remarkably affected by the synthesis routes which in turn induce miscellaneous particle size, shape, and size distribution In this connection, a number of chemical and physical synthetic pathways has been addressed the production of nanoceria[19]

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