Enhanced Photocatalytic Activity and Electrochemical Behaviour Towards Hg(II) of CeO 2 :Ag Nanocomposite
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https://doi.org/10.1007/s11664-020-08466-3 Ó 2020 The Minerals, Metals & Materials Society
Enhanced Photocatalytic Activity and Electrochemical Behaviour Towards Hg(II) of CeO2:Ag Nanocomposite T. JAYALAKSHMI,1 S.A. PRASHANTH,2 FAHAD A. ALHARTHI,3 and G. NAGARAJU1,4 1.—Energy Materials Research Laboratory, Department of Chemistry, Siddaganga Institute of Technology (Affiliated to Visvesvaraya Technological University, Belagavi), Tumakuru 572103, India. 2.—Department of Chemistry, SVM Arts Science and Commerce College, Ilkal 587125, India. 3.—Department of Chemistry, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia. 4.—e-mail: [email protected]
CeO2 and CeO2:Ag nanocomposite were synthesized using succinic acid as a fuel by a simple solution combustion method. This method neither demands surfactants nor long reaction time. Synthesized materials were identified through several analytical tools such as photoluminescence spectroscopy, Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, scanning electron microscopy and x-ray diffraction. The photocatalytic activity of prepared nanomaterials were investigated by the photodegradation of trypan blue dye by varying the initial dye concentration and catalyst dosage. The result revealed that CeO2:Ag nanocomposite have shown the better photocatalytic activity than the CeO2 nanoparticle at pH 5 under ultraviolet light irradiation. Furthermore, CeO2:Ag nanocomposite is immobilized and electrically wired via immobilization upon glassy carbon electrodes to permit the creation of CeO2:Ag nanocomposite electrochemical sensor, which has been successfully evaluated for sensing Hg(II) at nano-molar (nM) levels in model aqueous solutions across differential pulse anodic striping voltammetry.
(Received April 21, 2020; accepted September 2, 2020)
Jayalakshmi, Prashanth, Alharthi and Nagaraju
Graphic Abstract
Key words: CeO2:Ag nanocomposite, cubic phase, photodegradation, trypan blue, electrochemical sensing
INTRODUCTION Cerium oxide (CeO2) nanoparticles are oxides of the rare earth metal cerium and exist as redox couple of Ce3+/Ce4+ oxidation states and they contain oxygen vacancies that allow CeO2 to act as regenerative catalysts.1 CeO2 nanoparticles, also known as nanoceria, have gained much interest due to a wide range of applications including photocatalysis,2 sunscreen, sensors, solar cells, solid electrolytes, polishing agents, fuel cells, oxygen pumps and metallurgy.3 In recent years, environmental pollution has been conspicuously increasing
due to industrial and agricultural sectors.4 Food, cosmetics, and textiles industries use many organic dyes, which are prime examples of environmental contamination and also contain Hg(II).5 Mercury ions are non-biodegradable and highly toxic to both humans and aquatic systems and cause diseases such as cognitive disorders, kidney damage and Minamata disease by its accumulation in the cell membrane. Therefore, monitoring Hg(II) ions at trace level concentration is necessary
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