Open AccessA Thiomidazolylborate based Carbon Paste Electrode for Voltametric Detection of Heavy Metals in Wastewater
Author(s) -
Gaber A.M. Mersal,
Hamdy S. ElSheshtawy,
Ahmed M. Fallatah,
Rabah Boukherroub,
Mohammed A. Amin,
Dalia I. Saleh,
Mohamed M. Ibrahim
Publication year - 2022
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2022.23580
Subject(s) - chemistry , cadmium , cyclic voltammetry , electrochemistry , detection limit , electrode , voltammetry , ligand (biochemistry) , analytical chemistry (journal) , inorganic chemistry , carbon paste electrode , dielectric spectroscopy , metal ions in aqueous solution , raman spectroscopy , ion , nuclear chemistry , chromatography , organic chemistry , biochemistry , physics , receptor , optics
The ligand potassium hydrotris(N- (2,6-xylyl)-2-thioimidazolyl)borate (KTtxylyl) was utilized toconstruct a carbon paste modified electrode (KTtxylyl/CPE), which was studied using electrochemicalimpedance spectroscopy, cyclic voltammetry and square wave voltammetry (SWV). Its electrochemicalresponse was investigated, and it demonstrated a significant improvement in the detection of bothlead(II) and cadmium(II), allowing determination of lead(II) at trace concentrations. The spectroscopicevidence includes FT-IR, Raman, 1H NMR and also DFT calculations using B3LYP/LANL2DZ levelof theory indicate the high affinities of these ions toward the ligand forming lead(II) and cadmiumcomplexes of the type [TtxylylMCl]. Negative electrostatic potential of the tri(thione) donors derivingtheir binding abilities toward both ions. The detection limits based on 3(SD/m) were; 0.112 μM and0.204 μM for lead(II) and cadmium(II), respectively. The simultaneous detection of these ions inseveral waste water samples was examined in order to verify the modified electrode. Data from theICP-AES instrument was compared to the results obtained.