Abstract
There is a significant concern about the increased by-products generated by the high demand for biodiesel. Therefore, reducing the consequences of waste disposal is particularly important, transforming such waste into materials with added value. In this work, activated carbons (ACs) were prepared from biodiesel waste (crude glycerin) by chemical activation, and microwaves as the energy source in the thermal conversion using full factorial experimental designs. The crude glycerin was impregnated with H3PO4 and activated in a N2 atmosphere. The results showed that the activation time is a critical factor in the specific surface area (SBET), and the impregnation ratio is a significant factor in the total pore volume (V0.95). The best AC was obtained at 1000 W, the activation time of 12 min, and the impregnation ratio of 1:3 (mglycerin:mH3PO4), resulting in 500 m2 g−1 and 0.55 cm3 g−1 for SBET and V0.95, respectively. In addition, the obtained ACs showed a maximum adsorption capacity of about 55 mg g−1 for amoxicillin. Thus, crude glycerin was a promisor raw material for preparing ACs using the microwave as a heat source.
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Dissertation, Thais Aline Prado Mendonça, Utilização de micro-ondas para preparação de materiais carbonosos a partir de diferentes resíduos. http://repositorio.unifesp.br/handle/11600/58715 .
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Acknowledgements
The authors acknowledge the financial support received from the Brazilian Funding Institutions FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo) (Process number 2018-21502-9 and 2018/09531-2), CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) (Process No. 305123/2018-1), and the Federal University of São Paulo (UNIFESP and NAPCEM).
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TAPM: data collection, analysis, interpretation of results, and Draft manuscript preparation. TRB: Interpretation of results and Draft manuscript preparation. MCR: Interpretation of results and Draft manuscript preparation. All authors reviewed the results and approved the final version of the manuscript. MG: study conception and design interpretation of results, Draft manuscript preparation, Project administration, Funding acquisition.
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Mendonça, T.A.P., Brazil, T.R., Rezende, M.C. et al. Synthesis of activated carbon from biodiesel waste as a sustainable environmental method using microwave heating. J Porous Mater 30, 739–750 (2023). https://doi.org/10.1007/s10934-022-01381-4
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DOI: https://doi.org/10.1007/s10934-022-01381-4