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Article

Activated Carbon from Spent Coffee Grounds: A Good Competitor of Commercial Carbons for Water Decontamination

1
Department of Industrial Engineering (DII), University of Padova, Via Marzolo 9, 35131 Padova, Italy
2
Department of Civil, Architectural and Environmental Engineering (DICEA), University of Padova, Via Marzolo 9, 35131 Padova, Italy
3
Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice–Scientific Campus, Via Torino 155/b, 30172 Mestre Venice, Italy
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(16), 5598; https://doi.org/10.3390/app10165598
Received: 14 July 2020 / Revised: 9 August 2020 / Accepted: 11 August 2020 / Published: 12 August 2020
(This article belongs to the Special Issue Advanced or Conventional Materials as Sorbent Ⅱ)
In the framework of the circular economy, spent coffee grounds were converted into powdered activated carbon by means of pyrolysis, using potassium hydroxide as the activating agent. Its adsorption capacity on a panel of phenolic compounds was compared with those of two commercial powdered activated carbons, after preliminary studies on organic dyes with different ionic properties, to assess the affinity between adsorbates and adsorbents. Pseudo-first-order and pseudo-second-order kinetic models were carried out, together with Freundlich and Langmuir isotherms. They were useful to calculate the breakthrough at 5%, 10%, and 50% of adsorption and the partition coefficients for the comparison of performance between different sorbent systems in a less biased manner (e.g., reducing bias associated with operational settings like sorbate concentration and sorbents dosage). The results showed that the removal efficiency for SCGs-AC was comparable with that of the commercial activated carbons with the highest partition coefficients for methylene blue (12,455 mg/g/μM, adsorption capacity = 179 mg/g) and 3-chlorophenol (81.53 mg/g/μM, adsorption capacity = 3765 mg/g). The lower efficiency in bromothymol blue and bisphenol-A adsorption was due to its different morphology and surface properties. View Full-Text
Keywords: emerging micropollutants; phenolic compounds; organic dyes; spent coffee grounds up-cycling; activated carbon from spent coffee grounds; adsorption on powdered activated carbons emerging micropollutants; phenolic compounds; organic dyes; spent coffee grounds up-cycling; activated carbon from spent coffee grounds; adsorption on powdered activated carbons
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MDPI and ACS Style

Rosson, E.; Garbo, F.; Marangoni, G.; Bertani, R.; Lavagnolo, M.C.; Moretti, E.; Talon, A.; Mozzon, M.; Sgarbossa, P. Activated Carbon from Spent Coffee Grounds: A Good Competitor of Commercial Carbons for Water Decontamination. Appl. Sci. 2020, 10, 5598. https://doi.org/10.3390/app10165598

AMA Style

Rosson E, Garbo F, Marangoni G, Bertani R, Lavagnolo MC, Moretti E, Talon A, Mozzon M, Sgarbossa P. Activated Carbon from Spent Coffee Grounds: A Good Competitor of Commercial Carbons for Water Decontamination. Applied Sciences. 2020; 10(16):5598. https://doi.org/10.3390/app10165598

Chicago/Turabian Style

Rosson, Egle, Francesco Garbo, Giovanni Marangoni, Roberta Bertani, Maria Cristina Lavagnolo, Elisa Moretti, Aldo Talon, Mirto Mozzon, and Paolo Sgarbossa. 2020. "Activated Carbon from Spent Coffee Grounds: A Good Competitor of Commercial Carbons for Water Decontamination" Applied Sciences 10, no. 16: 5598. https://doi.org/10.3390/app10165598

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