Publication: Graphene oxide and graphene oxide functionalized with silver nanoparticles as adsorbents of phosphates in waters. A comparative study
Authors
Vicente Martínez, Yésica
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Publisher
Elsevier B.V
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DOI
https://doi.org/10.1016/j.scitotenv.2019.136111
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info:eu-repo/semantics/article
Description
© 2019 Published by Elsevier B.V.
This document is the published version of a published work that appeared in final form in Science of the Total Environment
To access the final edited and published work see:
https://doi.org/10.1016/j.scitotenv.2019.136111
Abstract
Phosphate removal is an important factor thatmust be taken into account in eutrophizedwaters. For this reason,
many studies on differentways of removing phosphates fromwater have been published nowadays. In thiswork,
a comparative study between the use of graphene oxide (GO) and graphene oxide functionalized with silver
nanoparticles (GO@AgNPs) as adsorbents to remove phosphates from water samples has been carried out. Experimental
conditions, including the pH, adsorbent dose, contact time and temperature, have been analyzed to
achieve the highest adsorption efficiency. Although both adsorbents can be considered suitable for removing
phosphates from aqueous solutions, GO@AgNPs provided a maximum removal efficiency of 100%, reaching the
equilibrium conditions instantaneously under straightforward experimental conditions. Moreover, a much
lower adsorbent dose was necessary than with graphene oxide. When GO was used, the maximum removal efficiency
was 75%, 9 minwere necessary to reach the equilibriumconditions and 20mgof adsorbentwere needed.
Both adsorbents can be regenerated in an acid medium, giving recovery percentages of 98% and 80% for GO and
GO@AgNPs respectively, which allows them to be recycled and used again.
Citation
Science of the Total Environment 709 (2020) 136111
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