Abstract
In this study, a simple, one-pot, and eco-friendly biosynthesis of silver nanoparticles (AgNPs) was accomplished with the use of aqueous leaves extract of Cestrum nocturnum L.(AECN). Different techniques like ultraviolet–visible (UV–Vis) spectrophotometry, Fourier transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning area electron diffraction were used to investigate the optical, operational, and physical properties of the green synthesized AECN-AgNPs.The AECN-AgNPs were further used for the detection of Hg2+ by UV–Vis and electrochemical methods. The disintegration of the AECN-AgNPs solution caused the formation of an Ag-Hg amalgam, which caused discoloration of the solution. Sensing performance for a variety of metals such as Na+, K+, Mg2+, Ca2+, Ni2+, Cu 2+, Fe3+, Zn2+, Co2+, Cd2+, Pb2+, As3+, and Mn2+ at 10-mM concentrations was measured in order to determine the selectivity of the sensor towards the Hg2+. For the electrochemical determination of 2 + Hg2+ , AECN-AgNPs were immobilized on a glassy carbon (GC) electrode, and the resulting modified electrode (GC/AECN-AgNPs) was characterized by cyclic voltammetry. This phenomenon is advantageously used for the sensitive determination of trace level Hg2+. GC/AECN-AgNPs demonstrated a linear calibration range of 100 nM to 10 μM and a limit of detection of 21 nM for Hg2+ determination.
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Data used in this study are freely available to the public from the described sources in the method section.
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Funding
This paper was supported in part of grant from UGC (F-1–17-1/2014–15/RGNF-2014–15-SC-UTT-58260) to New Delhi, Government of India, and is gratefully acknowledged. PKS acknowledges the University Grant Commission, New Delhi, India (UGC No.F.30–431/2018 (BSR), M-14–58), and Institute of Eminence (IoE) Seed Grant, Banaras Hindu University, India (Scheme No.6031), for the financial support. Author Kavindra Nath Tiwari also acknowledges to IoE, Banaras Hindu University, Varanasi, India, for the financial support for the research work (Scheme No.6031).
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P Kumar: optimization of AECN-AgNPs synthesis. KN Tiwari, SK Mishra: supervision, methodology. PK Sonkar and V Ganesan: electrochemical detection and validation of Hg2+ sensing. AK Singh, J Singh, JDixit: plant material collection and extract preparation.
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Kumar, P., Sonkar, P., Tiwari, K.N. et al. Sensing of mercury ion using light induced aqueous leaf extract mediated green synthesized silver nanoparticles of Cestrum nocturnum L. Environ Sci Pollut Res 29, 79995–80004 (2022). https://doi.org/10.1007/s11356-022-19357-x
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DOI: https://doi.org/10.1007/s11356-022-19357-x