Design strategy of rGO-HNT-AgNPs based hybrid nanocomposite with enhanced performance for electrochemical determination of 4-nitrophenol
Monitoring of toxic organic pollutants in atmosphere is mandatory. Among them nitrophenols are considered as extensive toxic organic pollutants which causes many adverse effects through its consumption in biosphere. A highly precise and sensitive electrochemical sensor in order to detect 4-nitrophenol based on halloysite nanotubes (HNTs) with silver nanoparticles (AgNPs) decorated on reduced graphene oxide (rGO) is reported. The electrochemical performance of the prepared sensor was estimated through cyclic voltammetry and differential pulse voltammetry. The prepared nanomaterial was employed for efficient detection of 4-nitrophenol. The fabricated sensor exhibited a extensive working range from 0.1 to 363.9 µM under optimized condition through a lower detection limit of 48.6 nM for 4-nitrophenol (4-NP). The nanocomposite rGO-HNT-AgNP modified electrode showed a high sensitivity of 35.25 µA µM-1cm-2, which is much higher than the bare electrodes. Furthermore, the evaluation of the developed sensor was done on the basis of practical applicability by determining the presence of 4-NP in the real samples obtained from water resources with RSD ± 3.17%.