Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
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| URI | http://purl.tuc.gr/dl/dias/177B045C-604E-4EE3-8F89-2A8EE2C9EC33 | - |
| Αναγνωριστικό | https://www.sciencedirect.com/science/article/pii/S0048969716324640?via%3Dihub | - |
| Αναγνωριστικό | https://doi.org/10.1016/j.scitotenv.2016.11.034 | - |
| Γλώσσα | en | - |
| Μέγεθος | 9 pages | en |
| Τίτλος | Heteroaggregation of graphene oxide nanoparticles and kaolinite colloids | en |
| Δημιουργός | Sotirelis Nikolaos | en |
| Δημιουργός | Σωτηρελης Νικολαος | el |
| Δημιουργός | Chrysikopoulos Constantinos | en |
| Δημιουργός | Χρυσικοπουλος Κωνσταντινος | el |
| Εκδότης | Elsevier | en |
| Περίληψη | Graphene oxide (GO) is a material with rapid production growth, and consequently GO nanoparticles are expected to eventually penetrate subsurface formations, where fine mineral particles are in abundance. This study examines the heteroaggregation of GO nanoparticles with kaolinite (KGa-1b) colloids under various conditions. Dynamic batch experiments were conducted in solutions with different pH values (pH�=�4, 7, and 10), different ionic strengths (IS�=�7, 12, and 27�mM), and at three controlled temperatures (8, 14, and 25��C). The experimental results showed that a relatively small amount of GO nanoparticles (5–20% of the initial concentration) attached immediately onto KGa-1b colloids, and reached equilibrium in <�20�min. It was shown that neither temperature nor pH played a significant role in the attachment of GO nanoparticles onto KGa-1b colloids. In contrast, the attachment of GO nanoparticles onto KGa-1b colloids was shown to increase with increasing IS. Additionally, time-resolved dynamic light scattering (DLS) was used to identify the influence of IS on heteroaggregation between GO nanoparticles and KGa-1b colloids. The critical coagulation concentration (CCC) for the interaction between GO nanoparticles and KGa-1b colloids was 152�mM (NaCl). The interaction energies were calculated, for all experimental conditions, by using measured zeta potentials and applying the classical DLVO theory. The equilibrium experimental data were fitted with a Freundlich isotherm, and the attachment kinetics were described very well with a pseudo-second-order model. Furthermore, thermodynamic analysis revealed that the attachment process was nonspontaneous and exothermic. | en |
| Τύπος | Peer-Reviewed Journal Publication | en |
| Τύπος | Δημοσίευση σε Περιοδικό με Κριτές | el |
| Άδεια Χρήσης | http://creativecommons.org/licenses/by/4.0/ | en |
| Ημερομηνία | 2018-05-29 | - |
| Ημερομηνία Δημοσίευσης | 2017 | - |
| Θεματική Κατηγορία | Attachment | en |
| Θεματική Κατηγορία | Clays | en |
| Θεματική Κατηγορία | Graphene oxide | en |
| Θεματική Κατηγορία | Heteroaggregation | en |
| Θεματική Κατηγορία | Kaolinite | en |
| Θεματική Κατηγορία | Nanoparticles | en |
| Θεματική Κατηγορία | Thermodynamics | en |
| Βιβλιογραφική Αναφορά | N. P. Sotirelis and C. V. Chrysikopoulos, "Heteroaggregation of graphene oxide nanoparticles and kaolinite colloids," Sci. Total Environ., vol. 579, pp. 736-744, Feb. 2017. doi: 10.1016/j.scitotenv.2016.11.034 | en |
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