Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 8, Issue 5, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2020.104204
Keywords
Electrochemical sensor; Pt NPs; g-C3N4; Polythiophene; L-Cysteine; Hg cation
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Funding
- Farhangian University
- University of Malaya [IIRG013B-2019]
- Ministry of Education, Malaysia [PR003-2018A]
- University Malaya Centre for Ionic Liquids (UMCiL)
- RU Geran-Fakulti Program [GPF064B-2018]
- Fundamental Research Grant Scheme (FRGS) [FP071-2018A]
- [(PPP)PG093-2015B]
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The effect of g-C3N4 on the sensing performance of a Pt/g-C3N4/ polythiophene nanocomposite (Pt/g-C3N4 /PTh NCs) was investigated in this work. The nanocomposites were synthesized via the chemical reduction of Pt (II) in the presence of L-cysteine as the reducing agent. The synthesized nanocomposite was utilized as a sensing material for the electrochemical detection of Hg2+ and was investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry and differential pulse voltammetry. The electrical resistance from EIS measurements showed a decrease of 61.87 kohm. cm(- 2) for the Pt/PTh NCs compared to the Pt/g-C3N4 /PTh NCs, due to the increase of Pt adsorption onto the active sites of g-C3N4 and PTh. A linear voltammetric response was obtained between a concentration range of 1 and 500 nM Hg2+, with a detection limit (at S/N = 3) and sensitivity of 0.009 nM and 1.0787 mu A nM(-1). cm(-2), respectively.
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