Premium
Voltammetric Detection of Nitrite Anions Employing Imidazole Functionalized Reduced Graphene Oxide as an Electrocatalyst
Author(s) -
Tajiki Alireza,
Abdouss Majid,
Sadjadi Sodeh,
Mazinani Saeedeh
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060187
Subject(s) - graphene , electrocatalyst , nitrite , oxide , imidazole , surface modification , inorganic chemistry , detection limit , electrochemistry , electrode , linear range , raman spectroscopy , aqueous solution , chemistry , materials science , nanotechnology , organic chemistry , chromatography , physics , optics , nitrate
A kind of metal free catalyst with excellent electrocatalytic activity toward nitrite anions oxidation was synthesized through functionalization of graphene oxide (GO) with imidazole aromatic rings. Imidazole rings linked to graphene oxide nanosheets via 3‐chloropropyl trimethoxysilane (CPTMS) mediators following simultaneous thermally reduction of GO during the functionalization, to form rGO−Im for modification of gold electrode (GE). The sensing platform characterized by SEM, XRD, IR and Raman methods. The resulting rGO−Im‐GE sensor, responded sensitively to nitrite concentrations within a wide linear range (1 to 1000 μM) and indicated a relative low detection limit (LOD=0.28 μM, S/N=3) without interfering with common ions existing in aqueous media. Furthermore acceptable recoveries were obtained when applying the proposed sensor to tap water samples.