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Elucidating the adsorption mechanism of Rhodamine B on mesoporous coconut coir-based biosorbents through a non-linear modeling and recycling approach

  • Adsorption (and Catalysis or Photocatalysis) Applied to Environmental Protection
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Abstract

The search for renewable adsorbent materials has increased continuously, being the agro-wastes an interesting alternative. This work aimed to elucidate the mechanism of adsorption of Rhodamine B on crude and modified coconut fibers from aqueous systems and the feasibility of reusing the biosorbents. The chemical modification of crude coconut fiber was carried out by the organosolv process. The biosorbents were characterized by lignocellulosic composition, FTIR, TGA, WCA, SEM, nitrogen adsorption/desorption (BET-BJH), and pH of zero point of charge (pHPZC) analyses. The batch adsorption tests evaluated the effects of the adsorbent and adsorbate dosages, contact time, and temperature on Rhodamine B adsorption. For elucidating the adsorption mechanisms involved in the process, the non-linear forms of kinetic and isotherm models were used. The regeneration of the biosorbents was evaluated by carrying out the desorption experiments. Modified coconut fiber had an increase in the amount of α-cellulose, which influenced its structural, morphological, surface, and porous properties. The removal efficiency of Rhodamine B was about 90% for modified coconut fiber and 36% for crude coconut fiber. The dye adsorption was spontaneous and endothermic for both biosorbents, showing higher spontaneity and affinity with the adsorbate for biosorbent modified. Therefore, the coconut fiber can be considered an alternative to the traditional adsorbent materials that allows the reuse by four times without performance loss, in which its adsorptive capacity has increased through its chemical modification by a biorefinery process.

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Data availability

The authors declare that all data supporting the findings of this study are available within the article and its supplementary information files.

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Acknowledgements

The authors acknowledge Laboratório de Raios X at UFC for XRD analyses, Central Analítica-UFC/CT-INFRA/MCTI-SISNANO/Pró-Equipamentos for SEM analyses, Prof. Dr. Odair Pastor, and Dr. Laís Fregolente for BET analyses, and Prefeitura Especial de Gestão Ambiental at UFC for supplying some chemicals.

Funding

This study was funded by FUNCAP (DEP – 0164–00174.01.00/19), CNPq (407291/2018–0 and 409814/2016–4), and CAPES.

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Rogério J. M. Nascimento: data curation; formal analysis; investigation; methodology; writing—original draft; Luiz Carlos Alves Bezerra: formal analysis; investigation; Jéssica Silva de Almeida: data curation; formal analysis; investigation; Matheus de Oliveira Barros: data curation; formal analysis; investigation; Lucas Silva: data curation; formal analysis; investigation; Morsyleide Freitas Rosa: resources; writing—review and editing; Selma Elaine Mazzeto: resources; project administration; Diego Lomonaco: resources; project administration; Kilton Renan Alves Pereira: conceptualization; data curation; formal analysis; investigation; methodology; writing—review and editing; supervision; Francisco Avelino: conceptualization; data curation; formal analysis; investigation; methodology; writing—review and editing; funding acquisition; project administration; supervision.

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Correspondence to Francisco Avelino.

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The authors declare no competing interests.

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Responsible Editor: Tito Roberto Cadaval Jr

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Nascimento, R.J.M., Bezerra, L.C.A., Almeida, J.S. et al. Elucidating the adsorption mechanism of Rhodamine B on mesoporous coconut coir-based biosorbents through a non-linear modeling and recycling approach. Environ Sci Pollut Res 29, 79920–79934 (2022). https://doi.org/10.1007/s11356-022-18808-9

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  • DOI: https://doi.org/10.1007/s11356-022-18808-9

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