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Preparation of Activated Carbons from Spent Coffee Grounds and Coffee Parchment and Assessment of Their Adsorbent Efficiency

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Institute of Nutritional Science, University of Potsdam, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany
2
GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
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Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24–25, 14476 Potsdam, Germany
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Regional School of Sanitary Engineering and Water Resources (ERIS), University of San Carlos of Guatemala, Ciudad Universitaria Zona 12, Guatemala City 01012, Guatemala
*
Author to whom correspondence should be addressed.
Academic Editor: Bruno C. Marreiros
Processes 2021, 9(8), 1396; https://doi.org/10.3390/pr9081396
Received: 1 July 2021 / Revised: 6 August 2021 / Accepted: 11 August 2021 / Published: 12 August 2021
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 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. View Full-Text
Keywords: coffee by-products; spent coffee grounds; parchment; valorization; calcination; activated carbon; organic compounds adsorption coffee by-products; spent coffee grounds; parchment; valorization; calcination; activated carbon; organic compounds adsorption
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MDPI and ACS Style

Figueroa Campos, G.A.; Perez, J.P.H.; Block, I.; Sagu, S.T.; Saravia Celis, P.; Taubert, A.; Rawel, H.M. Preparation of Activated Carbons from Spent Coffee Grounds and Coffee Parchment and Assessment of Their Adsorbent Efficiency. Processes 2021, 9, 1396. https://doi.org/10.3390/pr9081396

AMA Style

Figueroa Campos GA, Perez JPH, Block I, Sagu ST, Saravia Celis P, Taubert A, Rawel HM. Preparation of Activated Carbons from Spent Coffee Grounds and Coffee Parchment and Assessment of Their Adsorbent Efficiency. Processes. 2021; 9(8):1396. https://doi.org/10.3390/pr9081396

Chicago/Turabian Style

Figueroa Campos, Gustavo A., Jeffrey P.H. Perez, Inga Block, Sorel T. Sagu, Pedro Saravia Celis, Andreas Taubert, and Harshadrai M. Rawel 2021. "Preparation of Activated Carbons from Spent Coffee Grounds and Coffee Parchment and Assessment of Their Adsorbent Efficiency" Processes 9, no. 8: 1396. https://doi.org/10.3390/pr9081396

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