Preparation of activated carbons from spent coffee and coffee parchment and assessment of their adsorbent efficiency
- The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investigated. The aim of this work was to prepare activated carbon from spent coffee grounds and parchment, and to assess their adsorption performance. The co-calcination processing with calcium carbonate was used to prepare the activated carbons, and their adsorption capacity for organic acids, phenolic compounds and proteins was evaluated. Both spent coffee grounds and parchment showed yields after the calcination and washing treatments of around 9.0%. The adsorption of lactic acid was found to be optimal at pH 2. The maximum adsorption capacity of lactic acid with standard commercial granular activated carbon was 73.78 mg/g, while the values of 32.33 and 14.73 mg/g were registered for theThe valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investigated. The aim of this work was to prepare activated carbon from spent coffee grounds and parchment, and to assess their adsorption performance. The co-calcination processing with calcium carbonate was used to prepare the activated carbons, and their adsorption capacity for organic acids, phenolic compounds and proteins was evaluated. Both spent coffee grounds and parchment showed yields after the calcination and washing treatments of around 9.0%. The adsorption of lactic acid was found to be optimal at pH 2. The maximum adsorption capacity of lactic acid with standard commercial granular activated carbon was 73.78 mg/g, while the values of 32.33 and 14.73 mg/g were registered for the parchment and spent coffee grounds activated carbons, respectively. The Langmuir isotherm showed that lactic acid was adsorbed as a monolayer and distributed homogeneously on the surface. Around 50% of total phenols and protein content from coffee wastewater were adsorbed after treatment with the prepared activated carbons, while 44, 43, and up to 84% of hydrophobic compounds were removed using parchment, spent coffee grounds and commercial activated carbon, respectively; the adsorption efficiencies of hydrophilic compounds ranged between 13 and 48%. Finally, these results illustrate the potential valorization of coffee by-products parchment and spent coffee grounds into activated carbon and their use as low-cost adsorbent for the removal of organic compounds from aqueous solutions.…
Author details: | Gustavo Adolfo Figueroa CamposORCiDGND, Jeffrey Paulo H. PerezORCiDGND, Inga BlockORCiD, Sorel Sagu TchewonpiORCiDGND, Pedro Saravia Celis, Andreas TaubertORCiDGND, Harshadrai Manilal RawelORCiDGND |
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DOI: | https://doi.org/10.3390/pr9081396 |
ISSN: | 2227-9717 |
Title of parent work (English): | Processes : open access journal |
Publisher: | MDPI |
Place of publishing: | Basel |
Publication type: | Article |
Language: | English |
Date of first publication: | 2021/07/01 |
Publication year: | 2021 |
Release date: | 2021/10/18 |
Tag: | activated carbon; calcination; coffee by-products; organic compounds adsorption; parchment; spent coffee grounds; valorization |
Volume: | 9 |
Issue: | 8 |
Article number: | 1396 |
Number of pages: | 18 |
Funding institution: | Universität Potsdam |
Funding institution: | Katholischer Akademischer Auslander-Dienst KAAD, Germany |
Funding institution: | Helmholtz Recruiting Initiative |
Funding institution: | Alexander von Humboldt Foundation under the Georg Forster Research Fellowship, Alexander von Humboldt Foundation |
Funding number: | PA 2021_090 |
Funding number: | 701549 |
Funding number: | I-044-16-01 |
Funding number: | 3.4-CMR-1164093-GF-P |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Mathematisch-Naturwissenschaftliche Fakultät / Institut für Ernährungswissenschaft | |
DDC classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Peer review: | Referiert |
Grantor: | Publikationsfonds der Universität Potsdam |
Publishing method: | Open Access / Gold Open-Access |
DOAJ gelistet | |
License (German): | CC-BY - Namensnennung 4.0 International |
External remark: | Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 1158 |