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Open AccessArticle

Removal of Copper from Water by Adsorption with Calcium-Alginate/Spent-Coffee-Grounds Composite Beads

1
University of Puerto Rico, Mayaguez Campus, Department of Chemistry, Mayaguez 00681, Puerto Rico
2
Pontifical Catholic University of Puerto Rico, Ponce Campus, Tosello Giangiacomo Scientific Research Center, Ponce 00731, Puerto Rico
*
Author to whom correspondence should be addressed.
Materials 2019, 12(3), 395; https://doi.org/10.3390/ma12030395
Received: 19 December 2018 / Revised: 22 January 2019 / Accepted: 23 January 2019 / Published: 27 January 2019
(This article belongs to the Special Issue Environmentally Friendly Renewable Materials)
Calcium Alginate/Spent-Coffee-Grounds composite beads (CA-SCGs beads), which were made of two different proportions of alginate and spent-coffee-grounds (3:3 and 3:10), respectively, were used to adsorb Cu2+ in aqueous solution. These beads were compared with calcium alginate beads (CA beads) and spent-coffee-grounds (SCGs) in terms of adsorption capacity and rate of adsorption. The experiments were carried out at an initial pH of 4 at 30 °C with initial concentrations of Cu2+ from 10 ppm to 100 ppm. Equilibrium data was fitted with Langmuir, Freundlich and Sips models, and a pseudo-second-order kinetic equation. The Sips model showed the best correlation with the experimental values. CA-SCGs (3:3) beads showed a faster adsorption rate versus the CA beads. Also, CA-SCGs (3:3) beads showed a larger capacity of adsorption according to the Sips model, but not in the Langmuir model. FT-IR spectra and SEM images were taken for characterization. This study has shown that the CA-SCGs (3:3) beads have a synergistic effect, combining the capacity of adsorption of CA beads with the kinetics of the SCGs. The CA-SCGs beads have proven to be an effective adsorbent of Cu2+. Therefore, they can provide a use for the SCGs; which are considered pollutants in landfills. View Full-Text
Keywords: removal of copper; calcium alginate; spent coffee grounds; water pollution; kinetics of adsorption removal of copper; calcium alginate; spent coffee grounds; water pollution; kinetics of adsorption
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MDPI and ACS Style

Torres-Caban, R.; Vega-Olivencia, C.A.; Alamo-Nole, L.; Morales-Irizarry, D.; Roman-Velazquez, F.; Mina-Camilde, N. Removal of Copper from Water by Adsorption with Calcium-Alginate/Spent-Coffee-Grounds Composite Beads. Materials 2019, 12, 395. https://doi.org/10.3390/ma12030395

AMA Style

Torres-Caban R, Vega-Olivencia CA, Alamo-Nole L, Morales-Irizarry D, Roman-Velazquez F, Mina-Camilde N. Removal of Copper from Water by Adsorption with Calcium-Alginate/Spent-Coffee-Grounds Composite Beads. Materials. 2019; 12(3):395. https://doi.org/10.3390/ma12030395

Chicago/Turabian Style

Torres-Caban, Roberto; Vega-Olivencia, Carmen A.; Alamo-Nole, Luis; Morales-Irizarry, Daisy; Roman-Velazquez, Felix; Mina-Camilde, Nairmen. 2019. "Removal of Copper from Water by Adsorption with Calcium-Alginate/Spent-Coffee-Grounds Composite Beads" Materials 12, no. 3: 395. https://doi.org/10.3390/ma12030395

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