Electrochemical detection of Pb(ii) and Cd(ii) using bismuth ferrite nanoparticle modified carbon paste electrodes

Abstract

This study presents bismuth ferrite nanoparticles (BFO) modified carbon paste electrode for determination of lead and cadmium. XRD and FT-IR were used to characterize the bismuth ferrite nanoparticles synthesized following...

Geometric Transformation of Modified Multiwalled Carbon Nanotubes-Based Heterometallic Nanostructured Material: A Model for the Electrochemical Discrimination of Insecticides

“…The formation of a new oxidation peak was due to the adsorption of Pb 2+ through the “N” atom of the thiourea moiety through electrostatic interactions, which gets reduced to Pb 0 by nonbonding electrons of the thiourea moiety in a reversible manner (Figure C). The presence of both oxidation states (Pb 2+ and Pb 0 ) are confirmed from XPS and CV, where a sharp oxidation peak was formed at −0.34 V with a corresponding broad reduction peak at −0.33 V. , The stepwise mechanism of all steps is illustrated in a schematic representation (Figure A). The final heterometallic nanostructured material MWCNTs@KR-6/Mn/Sn/Pb showed excellent dispersibility as compared to monometallic and bimetallic complexes along with enhanced currents, making it a more electrochemically active material.…”

Determination of Pb2+ and Cd2+ ions in raw milk, honey and groundnut shell using TSAB/MWCNT

“…, 3 and 10 ppb, respectively. 34 Subsequently, the evaluation of TSAB/MWCNT was compared with earlier reports on modified electrodes for the analysis of Pb 2+ and Cd 2+ , and data are presented in Table 3. It was found that the fabricated modified electrode exhibited similar or even better analytical performances for the analysis of Pb 2+ and Cd 2+ .…”

“…Furthermore, the lowest detection limit (S/N = 3) was calculated to be 0.13 ppb and 0.4 ppb for Pb 2+ and Cd 2+ , respectively, which is significantly lower than the recommended value for drinking water according to the WHO, i.e., 3 and 10 ppb, respectively. 34 Subsequently, the evaluation of TSAB/MWCNT was compared with earlier reports on modified electrodes for the analysis of Pb 2+ and Cd 2+ , and data are presented in Table 3. It was found that the fabricated modified electrode exhibited similar or even better analytical performances for the analysis of Pb 2+ and Cd 2+ .…”

“…This can be attributed to the competition of the different metals with the Pb 2+ and Cd 2+ analytes and the interfering Hg 2+ , Ni 2+ , Cu 2+ , Sn 2+ and Zn 2+ for the active sites present on the TSAB/MWCNT electrode surface. 34…”

Development of Meta‐Chemical Surface by Dip‐Pen Nanolithography for Precise Electrochemical Lead Sensing

“…[ 59 ] Apart from that, various microscale sensors fabricated using copper [ 30 ] or gallium oxide [ 60 ] have shown LoD values for Pb of ≈4 and ≈17.1 ppb, respectively; with a silver electrode, the LoD reportedly reached up to 0.5 ppb. [ 61 ] Several other works have also been published based on conventional three‐electrode systems, such as graphene–polypyrrole [ 62 ] and bismuth ferrite‐modified carbon‐paste electrodes [ 63 ] ; they showed 0.009 and 6.2 ppb for the LoD, respectively. It is important to note that the limit of detection (LoD) is 0.94 ppb for KNO 3 electrolytes (Figure S6a,b, Supporting Information), which is double that of the sodium acetate buffer electrolytes (LoD ≈0.49 ppb) (Figure 4b).…”