Application of chemically modified waste tucumã (Astrocaryum aculeatum) seeds in the biosorption of methylene blue: Kinetic and thermodynamic parameters

Document Type

Journal Article

Publication Title

Environmental Science and Pollution Research

Volume

31

Issue

23

First Page

34097

Last Page

34111

PubMed ID

38693458

Publisher

Springer

School

School of Engineering

RAS ID

71367

Funders

Fundação de Amparo à Pesquisa do Estado do Amazonas

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

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.

DOI

10.1007/s11356-024-33517-1

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