Abstract
ABSTRACT Carbon quantum dots derived from green biomass sources have been an emerging topic in recent times. Various biomass sources such as fruit peels, rice husks, corn cobs, sugarcane bagasse, etc have been employed in green synthesis of carbon dot. In this work, carbon quantum dots were synthesised from Blumea lacera as precursor using hydrothermal method. Blumea lacera is quite popular in many countries and available around the year. Crystal structure, morphology and stability of synthesised quantum dots were also studied with X-ray diffraction, Fourier transmission infrared spectroscopy, Raman spectroscopy, transmission electron microscopy, and Zeta potential measurement. The obtained carbon dots of about 5 nm in diameter presented good stability (Zeta potential of −23 mV) and great dispersion in water. Influence of synthesis duration and incident wavelengths on optical properties of carbon dots were investigated. Based on photoluminescence quenching effect, heavy metal ion (Cd2+ and Mn2+) detection was implemented successfully even at low concentration (10−7 M for both Cd2+ and Mn2+). These results give the boost to accurate quantitative determination of different heavy metal ions.
Published Version
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