Abstract
Water soluble and fluorescent C-dots were synthesized from biomass wastes such as Camellia sinensis (tea), tea leaves; Terminalia chebula (silikha), silikha leaves; Carica papaya (papaya) leaves; Piper betle (paan), and peel of Citrus paradise (grape fruit) through pyrolysis and microwave process. The dynamic light scattering measurements show the size of the C-dots within the range 8.9–1.8 nm, all having negative zeta potentials within the range −13.4 to −18.9. The negative zeta potential is due to the presence of COO– group as evidenced by the IR spectroscopy. The photoluminescence study was conducted for all carbon dots in which all exhibited excitation-dependent fluorescence. The synthesized C-dots have been embedded in previously synthesized MCM-41. Blank MCM-41 and C-dot MCM-41 composite was characterized with the help of XRD, which confirms the presence of carbon dots in the MCM-41. The decrease in the heavy metal concentration was monitored with atomic absorption spectroscopy (AAS) which shows efficient adsorption in the composite. The study found that lead adsorption was more effective when papaya C-dot embedded MCM-41 was used as an adsorbent.
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Bhattacharjee, T., Das, S.R., Choudhury, H.K., Deka, D., Majumdar, G. (2023). Fluorescent Carbons Dots from Bio-Wastes Immobilized on Mesoporous Silica as an Affordable Next-Generation Catalyst for Adsorptive Removal of Lead. In: Deka, D., Majumder, S.K., Purkait, M.K. (eds) Sustainable Environment. NERC 2022. Springer, Singapore. https://doi.org/10.1007/978-981-19-8464-8_9
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