Abstract
In this study, a fluorescent polyethylenimine carbon dots (PEI-CDs) and an adsorbent lanthanum orthoferrite (LaFeO3) are composited as PEI-CDs/LaFeO3 (LFPC), concerning simultaneous detection and removal of cadmium (Cd) ions in the aqueous medium. The fluorescent “Off-On” mechanism is used in detecting cadmium ions and the removal of Cd ions is achieved by the adsorption method. Metal ions selectivity, optimization of the sensor with pH and time, the limit of detection, batch experiments (effect on adsorption by varying pH, initial concentration of metal ions, and adsorbent dosage), and adsorption isotherm studies are carried out in a standardized methodology for effective detection and removal of cadmium ions. The sample's pH is a significant parameter for both detection and removal, here pH 6 is an optimum condition to attain high fluorescent sensitivity and adsorption efficiency. Real sample analysis is performed to check the material's practicability. The synthesized material is characterized by X-ray diffraction, UV‐Vis spectroscopy, photoluminescence spectroscopy, Fourier transform infrared analysis, scanning electron microscopy, high-resolution transmission electron microscopy and energy dispersive X-ray analysis. The lifetime of a fluorophore and zeta potential measurements support the mechanism behind the sensing and the removal of cadmium ions.
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