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Modification of Non-Activated Carbon from Rubber Fruit Shells with 3-(Aminopropyl)-Triethoxysilane and Its Adsorption Study on Coomassie Brilliant Blue and Methylene Blue in Solution

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Abstract

This study involved modifying carbon derived from rubber fruit shells, referred to as nAC-RFs, without activation. The modification process utilized a silane agent known as 3-Aminopropyl-Triethoxysilane (APTES), resulting in the formation of nAC-RFs-S. To confirm the successful modification, the adsorbent underwent characterization using an Infrared Spectrometer (IR) to identify functional groups and Scanning Electron Microscopy-Energy Dispersive-X-ray (SEM–EDX) to analyze surface morphology and constituent elements. The adsorption capacity of nAC-RFs-S was evaluated through batch adsorption experiments involving Coomassie Brilliant Blue (CBB) dye (anionic) and Methylene Blue (MB) dye (cationic). The optimal conditions for CBB and MB adsorption on both nAC-RFs and nAC-RFs-S were found to be pH 5, a contact time of 90 min, and a temperature of 27 °C. The adsorption kinetics of CBB and MB onto nAC-RFs and nAC-RFs-S followed the pseudo-second-order kinetic model. The pseudo-second-order rate constants (k2) for CBB were 2.674 × 10–3 and 0.185 × 10–3 (g/mg·min) for nAC-RFs and nAC-RFs-S, respectively, while for MB, the corresponding values were 2.735 × 10–3 and 0.415 × 10–3 (g/mg·min). CBB adsorption tended to conform to the Freundlich adsorption isotherm model on nAC-RFs, whereas, on nAC-RFs-S, it tended to align with the Langmuir adsorption isotherm model. For MB, both nAC-RFs and nAC-RFs-S exhibited adsorption tendencies that followed the Freundlich isotherm model. The nAC-RFs-S adsorbent demonstrated remarkable effectiveness in adsorbing CBB and MB in solution, with the ability to be reused for up to three cycles while maintaining an adsorption percentage exceeding 80%. Consequently, the nAC-RFs-S adsorbent holds promise as an advantageous and efficient solution for combating water pollution caused by toxic chemicals like synthetic dyes.

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All data generated or analyzed during this study are included in this published article.

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Acknowledgements

The authors express their gratitude to the Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia (KemendikbudRistek) for providing funding for this project under contract number: 027/E5/PG.02.00.PL/2023. We also acknowledge the support of the Research and Community Service Institute of the University of Lampung (LPPM Universitas Lampung) for their assistance in conducting this research.

Funding

This work was funded by Ministry of Education, Culture, Research and Technology (Kemdikbudristek) of the Republic of Indonesia with contract number: 027/E5/PG.02.00.PL/2023.

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Buhani: Conceptualization, methodology, Investigation, Data curation, and writing original draft.

Jilda Sofiana Dewi: Methodology, Investigation, and Data curation.

Nadya Syarifatul Fajriyah: Methodology, Investigation, and Data curation.

Mita Rilyanti: Methodology, Investigation, Data curation, and Data analysis.

Suharso: Conceptualization, methodology, Investigation, and Data curation.

Sumadi: Conceptualization, Data curation, Data analysis, and editing.

Khalid Z. Elwakeel: Review and editing.

Corresponding author

Correspondence to Khalid Z. Elwakeel.

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Buhani, Dewi, J.S., Fajriyah, N.S. et al. Modification of Non-Activated Carbon from Rubber Fruit Shells with 3-(Aminopropyl)-Triethoxysilane and Its Adsorption Study on Coomassie Brilliant Blue and Methylene Blue in Solution. Water Air Soil Pollut 234, 578 (2023). https://doi.org/10.1007/s11270-023-06506-2

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  • DOI: https://doi.org/10.1007/s11270-023-06506-2

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