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. 2019 Jan 27;12(3):395. doi: 10.3390/ma12030395

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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FTIR spectra. (A): Raw Spent-Coffee-Grounds (SCGs), (B): Pre-treated SCGs, (C): Calcium Alginate (CA) beads, (D): Calcium Alginate/Spent-Coffee-Grounds (CA/SCGs) (3:3) beads, (E): CA/SCGs (3:10) beads.