TY - JOUR
T1 - Cryogel-based Ag°/Ag2O nanocomposites for iodide removal from water
AU - Baimenov, A. Zh
AU - Berillo, D. A.
AU - Inglezakis, V. J.
N1 - Funding Information:
The current work was financially supported by the state grant of the Ministry of Education and Science of Kazakhstan under the framework of research grant for PhD students, the projects “Noble metals nanocomposites hyper-activity in heterogeneous non-catalytic and catalytic reactions (HYPERMAT)”, SOE2019012 (2019–2021) , Grant Number 110119FD4536 funded Nazarbayev University and “Nanoporous and Nanostructured Materials for Medical Applications (NanoMed)”, the HORIZON 2020 , H2020-MSCA-RISE-2016, 734641 funded by the European Commission . DB thanks Poul Due Jensen Foundation (KK, NPR) for supporting time when writing this paper and the University of Alicane for the seawater samples and analysis.
Funding Information:
The current work was financially supported by the state grant of the Ministry of Education and Science of Kazakhstan under the framework of research grant for PhD students, the projects ?Noble metals nanocomposites hyper-activity in heterogeneous non-catalytic and catalytic reactions (HYPERMAT)?, SOE2019012 (2019?2021), Grant Number 110119FD4536 funded Nazarbayev University and ?Nanoporous and Nanostructured Materials for Medical Applications (NanoMed)?, the HORIZON 2020, H2020-MSCA-RISE-2016, 734641 funded by the European Commission. DB thanks Poul Due Jensen Foundation (KK, NPR) for supporting time when writing this paper and the University of Alicane for the seawater samples and analysis.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - In this study novel silver-modified cryogels were synthesized and applied for the removal of iodide from aqueous solutions. The co-allylamine-methacrylic acid-DMAAm-BisAAm (AAC) and co-allylamine-2-acrylamido-2-methyl-1-propansulfonic acid-DMAAm-BisAAm (SAC) cryogels were decorated with silver by one-step ion-exchange technique and characterized by TEM/EDS, SEM/EDS, FT-IR, XRD and zeta potential measurements. The silver loading was up to 159 and 98 mg/g for AAC and SAC cryogel nanocomposites, respectively. The silver is found in the structure of cryogels in the form of Ag2O and Ag° nanoparticles and the formation of metallic silver is attributed to in situ reduction of silver by the functional groups of the cryogels. The nanocomposites showed rapid kinetics and high adsorption capacity towards iodide. The equilibrium studies showed that in some samples the removal of iodide is higher than the theoretically expected based on the Ag:I molar ratio of 1:1. The analysis of the surface of the cryogels confirmed the theoretical Ag:I molar ratio and a study of the solution phase revealed that small amounts of leached Ag+ from the cryogels resulted in the formation of AgI colloids which, under the conditions of the experiments, exhibit Ag:I molar ratios lower than the theoretical value explaining the discrepancies between the theoretical and actual iodide removal rates.
AB - In this study novel silver-modified cryogels were synthesized and applied for the removal of iodide from aqueous solutions. The co-allylamine-methacrylic acid-DMAAm-BisAAm (AAC) and co-allylamine-2-acrylamido-2-methyl-1-propansulfonic acid-DMAAm-BisAAm (SAC) cryogels were decorated with silver by one-step ion-exchange technique and characterized by TEM/EDS, SEM/EDS, FT-IR, XRD and zeta potential measurements. The silver loading was up to 159 and 98 mg/g for AAC and SAC cryogel nanocomposites, respectively. The silver is found in the structure of cryogels in the form of Ag2O and Ag° nanoparticles and the formation of metallic silver is attributed to in situ reduction of silver by the functional groups of the cryogels. The nanocomposites showed rapid kinetics and high adsorption capacity towards iodide. The equilibrium studies showed that in some samples the removal of iodide is higher than the theoretically expected based on the Ag:I molar ratio of 1:1. The analysis of the surface of the cryogels confirmed the theoretical Ag:I molar ratio and a study of the solution phase revealed that small amounts of leached Ag+ from the cryogels resulted in the formation of AgI colloids which, under the conditions of the experiments, exhibit Ag:I molar ratios lower than the theoretical value explaining the discrepancies between the theoretical and actual iodide removal rates.
KW - Cryogels
KW - Iodide removal
KW - Nanocomposites
KW - Silver nanoparticles
KW - Water treatment
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U2 - 10.1016/j.molliq.2019.112134
DO - 10.1016/j.molliq.2019.112134
M3 - Article
AN - SCOPUS:85077027407
VL - 299
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
SN - 0167-7322
M1 - 112134
ER -