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Effective removal of anionic textile dyes using adsorbent synthesized from coffee waste
Abstract
Adsorption of Reactive Black 5 and Congo Red from aqueous solution by coffee waste modified with polyethylenimine was investigated. The removal percentages of both dyes increased with amount of polyethyleneimine in the modified adsorbent. Characterization revealed that polyethyleneimine modification improved the adsorbent surface chemistry, while slight improvement of adsorbent textural properties was also observed. The adsorbent’s excellent performance was demonstrated by high removal percentages towards the anionic dyes in most experimental runs. The modelling result showed that anionic dyes adsorption occurred via monolayer adsorption, and chemisorption was the rate-controlling step. The adsorbent possesses higher maximum adsorption capacity towards Reactive Black 5 (77.52 mg/g) than Congo Red (34.36 mg/g), due to the higher number of functional groups in Reactive Black 5 that interact with the adsorbent. This study reveals the potential of adsorbent derived from coffee waste in textile wastewater treatment. Furthermore, surface chemistry modification is proven as an effective strategy to enhance the performance of biowaste-derived adsorbents.
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Coffee waste demonstrates a characteristic three-dimensional carbon structure, with a rough surface and a porous system that allows it to function as a promising adsorbent for the removal of anionic CR and RB5 dyes from aqueous solutions.
“The coffee waste demonstrates a characteristic three-dimensional carbon structure, with a rough surface and a porous system that allows it to function as a promising adsorbent for the removal of anionic CR and RB5 dyes from aqueous solutions [156].”
From Recent Advances in the Remediation of Textile-Dye-Containing Wastewater: Prioritizing Human Health and Sustainable Wastewater Treatment (2024) · cites this paper as [156]
The Results and Discussion section (‘Characterizations of CW and PEI-CW’; page unavailable) describes unmodified coffee waste as having a three-dimensional carbon structure, rough surface, and pores. But the dye-removal study evaluated PEI-modified coffee waste, and the same section says its textural properties played a negligible role in adsorption. The claim therefore overstates the role of the porous structure in removing CR and RB5. (LLM, conf=0.90)
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Metadata
- Authors
- Wong, S., Ghafar, N. A., Ngadi, N., Razmi, F. A., Inuwa, I. M., Mat, R., & Amin, N. A. S.
- ORCID
- Wong, Syieluing
- Venue
- Scientific Reports
- Published
- 2020-02-19
- Volume
- 10
- Issue
- 1
- ISSN
- 2045-2322
- PMC
- PMC7031400
- Cited by
- 394
- References
- 0
- Language
- en
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