A facile highly selective colorimetric detection of Pb2+ ions using gold nanoparticles as a probe and its application in real samples analysis

Title : A facile highly selective colorimetric detection of Pb2+ ions using gold nanoparticles as a probe and its application in real samples analysis

Abstract:

In current times environmental pollution due to cause of heavy metal ions has reached one of the most demanding challenges on the earth. Among all heavy metals, lead ions are the most dangerous metal ions even at low concentrations. According to WHO the allowable level of Pb²⁺ in drinking water was less than 10 nM. Therefore, it’s very much crucial to detect Pb²⁺ ions selectively. Here I have introduced a facile green tactic way for synthesis of gold nanoparticles for colorimetric recognition of Pb²⁺ ions. Various spectroscopic techniques such as UV-Visible, FTIR, TEM, EDX, XRD, SAED, AFM, DLS, FE-SEM, XPS, Zeta Potential were applied for characterization of the nanoparticles. The BL- AuNPs exhibited a SPR peak 542 nm having diameter 25.26 nm with varying morphology like spherical, triangle, truncated triangles and decahedral. It shows very fast notable colorimetric identification of Pb²⁺ ions within 9 sec in naked eye. The synthesized probe displayed its maximum stability and sensing activity at a wide range of pH from 3.3 to 7.9, which was one of the most significant aspects of this research work. In addition, the probe exhibited very lower limit of detection (LOD=76.14 fM) by changing colour from red to violet with a prominent red shift of peak from 542 nm to 630 nm. Moreover, here no metal cations and anions are interfered. Besides, our synthesized probe was useful in real samples analysis and the results demonstrated it fitted large scale recovery with good precision.

Keywords: BL-AuNPs, Pb²⁺ ions, Wide pH range, Aggregation, Femtomolar, Real Application

Biography:

Dr. Manjushree Bhattacharyya has completed Ph.D. work in Chemistry as a Research Fellow (02/01/2019 - 02/01/2024) using the scheme of UGC- NET (JRF), All India Rank (AIR)-58. She did her Master's (rank holder, 3rd rank) in Vidyasagar University with specialization of Organic Chemistry in 2015. She has carried out Bachelor of Science (B.Sc.) in Chemistry (Honours) with silver medal award in 2013. She has also qualified various national exam like JAM, Joint CSIR-UGC NET, GATE. Her major research interest is the development of nanoparticles-based sensors for detection of toxic metal ions through colorimetric approach.