Synthesis of columnar‐shaped CeO ₂ and electrochemical sensor for detecting phenol

Abstract

Highly uniform columnar-shaped CeO 2 was successfully prepared in large quantities by calcining a precursor, which was prepared by a simple hydrothermal method. The structure and morphology of the precursor and the columnar CeO 2 were characterised by X-ray diffraction and scanning electron microscopy. The columnar CeO 2 was fixed on a glassy carbon electrode to obtain a columnar CeO 2 sensor for detection of phenol. The anodic peak current was proportional to the phenol concentration in the range of 0.005-0.225 mmol l −1 (R = 0.995) and 0.225-1.125 mmol l −1 (R = 0.998) with the detection limit of 0.9 μmol l −1. This electrochemical method has the advantages of simplicity and ease of fabrication, rapid detection, low cost of the apparatus and wide dynamic ranges.

A phenol phosphorescent microsensor of mesoporous molecularly imprinted polymers

“…Through a 0.45 mM Supor lter, the water samples collected from a nearby river were ltered and stored in a pre-cleaned beaker. No phenol analogs were detected in the 34 Electrochemical sensors Phenol 3.4 mM N o X. Xiao 35 A columnar CeO 2 sensor Phenol 0.9 mmol L À1 No W. Li 36 Flow injection-chemoluminescence system Phenol 0.9 mmol L À1 Yes This method A mesoporous phosphorescent microsensor Phenol 1.4 mmol L À1 Yes Fig. 11 (a) The selectivity of Mn-doped ZnS QD@MIPs and Mn-doped ZnS QD@NIPs with the addition of several similar structural of phenols (5.0 mg L À1 ); (b) the selectivity of Mn-doped ZnS QD@ms-MIPs and Mn-doped ZnS QD@ms-NIPs with the addition of several similar structural of phenols (5.0 mg L À1 ).…”

Simple Synthesis of CeO2 Nanoparticle Composites In Situ Grown on Carbon Nanotubes for Phenol Detection

“…CeO 2 has a cubic fluorite structure, in which the Ce element has two oxidation states Ce 4+ and Ce 3+ . It is widely used in luminescent materials ( Huang et al, 2021 ) catalysts ( Zhu et al, 2019 ), electrode materials ( Xiao et al, 2018 ; Huang et al, 2019 ), and so on. For the purpose of further exploring the electrochemical application of CeO 2 , in this study, a simple hydrothermal route was used to in situ grow CeO 2 nanoparticles on the surface of carbon nanotubes.…”