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Nanocarbons from acid pretreated waste coffee grounds using microwave radiation

Zein, Sharif H.; Gyamera, Benjamin Asenso; Skoulou, Vasiliki K.


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Dr Sharif Zein
Senior Fellow HEA| Reader in Biorefinery Processes and Reaction Engineering| PI of Bioref Group

Benjamin Asenso Gyamera

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Dr Vicky Skoulou
Graduate Research Director (GRD) of School of Engineering ; Senior Lecturer (Assoc. Prof.) in Chemical Engineering-Bioenergy ; PI of the B3: Biomass Waste- BioenergH2- Biochars Challenge Group of PGRs and PDRAs


This study investigates the use of microwave radiation to produce nanocarbons from Waste Coffee Grounds (WCG). It is first step to demonstrate the potential of integrating the microwave power to conventional methods of carbonaceous materials and nanocarbons production, aiming to overcome their high production cost. The process parameters and interactions investigated were: microwave radiation power (W), temperature (°C) and residence time (min). Results obtained from the lab-scale experiments indicated the optimum conditions for maximizing the nanocarbons yield (wt%) from the H₂SO₄ acid pretreated WCG at 200 °C, 850 for 60 min resulting in a 87.6 wt% char yield which ranged between the average size of 100–140 nm and lower. Moreover, the optimum conditions to achieve the maximum yield of nanocarbons (wt%) where: same temperature (200 °C), lower microwave power (650 W) and residence time (45 min). Then a yield of 60 wt% nanocarbons of average sizes 60 nm were produced, indicating the potential of this method to produce value-added biomaterials (spherical shaped nanocarbons) applicable for future scientific breakthroughs.


Zein, S. H., Gyamera, B. A., & Skoulou, V. K. (2017). Nanocarbons from acid pretreated waste coffee grounds using microwave radiation. Materials letters, 193, 46-49.

Acceptance Date Jan 21, 2017
Online Publication Date Jan 24, 2017
Publication Date Apr 15, 2017
Deposit Date Feb 20, 2017
Publicly Available Date Jan 24, 2018
Journal Materials letters
Print ISSN 0167-577X
Electronic ISSN 1873-4979
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 193
Pages 46-49
Keywords Biomass; Carbonaceous; Waste; Microwave; Pre-treatment; Biomaterials
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Additional Information Authors' accepted manuscript of article published in: Materials letters, 2017, v.193.


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