Application of chemically modified waste tucumã (Astrocaryum aculeatum) seeds in the biosorption of methylene blue: Kinetic and thermodynamic parameters
Abstract
Dye effluents cause diverse environmental problems. Methylene blue (MB) dye stands out since it is widely used in the textile industry. To reduce the pollution caused by the MB, we developed biosorbents from tucumã seeds, where the in natura seeds were treated with NaOH (BT) and H3PO4 (AT) solutions and characterized by Boehm titration, point of zero charges, FTIR, TGA, BET, and SEM. It was observed that the acid groups predominate on the surface of the three biosorbents. The process was optimized for all biosorbents at pH = 8, 7.5 g/L, 240 min, C0 = 250 mg/L, and 45 ℃. BT was more efficient in removing MB (96.20%; QMax = 35.71 mg/g), while IT and AT removed around 60% in similar conditions. The adsorption process best fits Langmuir and Redlich-Peterson isotherms, indicating a hybrid adsorption process (monolayer and multilayer) and pseudo-second-order kinetics. Thermodynamic data confirmed an endothermic and spontaneous adsorption process, mainly for BT. MB was also recovered through a desorption process with ethanol, allowing the BT recycling and reapplication of the dye. Thus, an efficient and sustainable biosorbent was developed, contributing to reducing environmental impacts.
Document Type
Journal Article
Date of Publication
5-1-2024
Volume
31
Issue
23
PubMed ID
38693458
Publication Title
Environmental Science and Pollution Research
Publisher
Springer
School
School of Engineering
RAS ID
71367
Funders
Fundação de Amparo à Pesquisa do Estado do Amazonas
Copyright
subscription content
First Page
34097
Last Page
34111
Comments
Lobo, W. V., Loureiro Paes, O. A. D. R., Pinheiro, W., Soares, E. R., de Souza, M. P., dos Santos Sousa, A., ... & de Freitas, F. A. (2024). Application of chemically modified waste tucumã (Astrocaryum aculeatum) seeds in the biosorption of methylene blue: kinetic and thermodynamic parameters. Environmental Science and Pollution Research, 31(23), 34097-34111. https://doi.org/10.1007/s11356-024-33517-1