Functionalization of synthetic saponite: Identification of grafting sites and application for anions sequestration
Source abstract
Abstract
The present work reports the study of the mechanism of grafting of an alkoxysilane on the surface of a synthetic saponite. XRD and SEM/EDX characterizations confirmed the effective synthesis of the clay mineral with structural formula INTNa0.50TET[Si3.50Al0.50]OCT[Mg3]O10(OH)2. The functionalization of this material in its pristine or acid pre-treated form with a cationic silane (tetradecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride) yielded a nanohybrid organoclay with interesting structural and chemical properties highlighted by 29Si solid state NMR, XRD, FTIR, TGA and electrochemical characterizations. The monodentate and bidentate grafting of the alkoxysilane was observed regardless the starting material was pristine or acid pre-treated saponite. The more significant layer-to-layer distance increase observed after the functionalization of acid pre-treated saponite indicated some interlayer intercalation/grafting of the alkoxysilane. Electrochemical characterization (cyclic voltammetry and electrochemical impedance spectroscopy) showed that the modified clay mineral exhibited anionic exchange property due to the presence of grafted cationic alkoxysilane. This anionic exchange capacity was confirmed when successfully applied for the adsorption of the anionic dye Congo Red. In all cases, the acid pre-treatment tended to improve the anion exchange property of the organoclay.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Mesoporous Materials and Catalysis · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
Show source-provided references
1. P. mondial de l’UNESCO pour l’évaluation des ressources en Eau, The United Nations world water development report 2021: valuing water, UNESCO, Paris, 2021. https://unesdoc.unesco.org/ark:/48223/pf0000375724.
2. Surface modification of Cameroonian magnetite rich clay with Eriochrome Black T. Application for adsorption of nickel in aqueous solution10.1016/j.apsusc.2012.04.065 ↗
3. Functionalization of colloidal silica and silica surfaces via silylation reactions10.1007/BF01411109 ↗
4. Physicochemical characterization of silylated functionalized materials10.1016/j.jcis.2010.01.026 ↗
5. Materials design of layered silicates through covalent modification of interlayer surfaces10.1039/c1jm10460h ↗
6. Functionalization of synthetic talc-like phyllosilicates by alkoxyorganosilane grafting10.1039/c0jm01276a ↗
7. Silylation of montmorillonite surfaces: Dependence on solvent nature10.1016/j.jcis.2012.08.077 ↗
8. Silylation of clay mineral surfaces10.1016/j.clay.2012.09.028 ↗
9. Transforming inorganic layered montmorillonite into inorganic–organic hybrid materials for various applications: a brief overview10.1039/C6QI00179C ↗
10. Preparation of polymer/clay mineral nanocomposites via dispersion of silylated montmorillonite in a UV curable epoxy matrix10.1016/j.clay.2007.12.011 ↗
11. New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents10.1016/j.jcis.2009.08.041 ↗
12. Negrete, J.-M. Letoffe, J.-L. Putaux, L. David, E. Bourgeat-Lami, Aqueous Dispersions of Silane-Functionalized Laponite Clay Platelets. A First Step toward the Elaboration of Water-Based Polymer/Clay Nanocomposites, Langmuir. 20 (2004) 1564–1571. https://doi.org/10.1021/la0349267.10.1021/la0349267 ↗
13. Edge-modification of laponite with dimethyl-octylmethoxysilane10.1016/j.jcis.2008.01.032 ↗
14. Modification of external surface of laponite by silane grafting10.1016/j.jpcs.2003.10.031 ↗
15. Grafting of swelling clay materials with 3-aminopropyltriethoxysilane10.1016/j.jcis.2005.02.092 ↗
16. Grafting of montmorillonite with different functional silanes via two different reaction systems10.1016/j.jcis.2007.04.029 ↗
17. Characterization of organo-modified bentonite sorbents: the effect of modification conditions on adsorption performance10.1016/j.apsusc.2014.09.105 ↗
18. Silane functionalization of sodium montmorillonite nanoclay: the effect of dispersing media on intercalation and chemical grafting10.1016/j.clay.2017.12.020 ↗
19. Grafting of organophilic silane in the interlayer space of acid-treated smectite: application to the direct electrochemical detection of glyphosate10.1016/j.clay.2020.105513 ↗
20. Influence of dispersing medium on grafting of aminopropyltriethoxysilane in swelling clay materials10.1016/j.jcis.2005.12.049 ↗
21. Sodium montmorillonite silylation: unexpected effect of the aminosilane chain length10.1016/j.jcis.2010.07.059 ↗
22. Silylation of saponite with 3-aminopropyltriethoxysilane10.1016/j.clay.2016.05.026 ↗
23. M. Jaber, S. Komarneni, C.-H. Zhou, Synthesis of Clay Minerals, in: F. Bergaya, G. Lagaly, B. Theng (Eds.), Handb. Clay Sci., Elsevier, 2013: pp. 223–241. https://doi.org/10.1016/B978-0-08-098258-8.00009-2.10.1016/B978-0-08-098258-8.00009-2 ↗
24. Synthesis of smectite clay minerals: a critical review10.1346/CCMN.1999.0470501 ↗
25. Synthesis of clay minerals10.1016/j.clay.2010.06.019 ↗
26. Influence of the precursor and the temperature of synthesis on the structure of saponite10.1007/s42860-020-00099-1 ↗
27. An overview of the recent synthesis and functionalization methods of saponite clay10.1039/D0NJ00253D ↗
28. Microwave radiation and mechanical grinding as new ways for preparation of saponite-like materials10.1016/j.clay.2009.11.018 ↗
29. Preparation, characterization, and applications as heavy metals sorbents of covalently grafted thiol functionalities on the interlamellar surface of montmorillonite10.1021/es00005a026 ↗
30. Organosilane grafted acid-activated beidellite clay for the removal of non-ionic alachlor and anionic imazaquin10.1016/j.apsusc.2011.01.034 ↗
31. H. Suquet, C. de la Calle, H. Pezerat, Swelling and structural organization of saponite, Clays Clay Miner. 23 (1975) 1–9. https://www.scopus.com/inward/record.uri?eid=2-s2.0-0016474834&partnerID=40&md5=6706ef471d37c37a6730dffce25fde16.
32. Stoichiometry of a dissolution reaction of a trioctahedral vermiculite at pH 2.710.1016/j.gca.2008.09.036 ↗
33. Effect of particle size on the experimental dissolution and auto-aluminization processes of K-vermiculite10.1016/j.gca.2016.02.005 ↗
34. Socrates · 2004
35. J. Sanz, Chapter 12.7 Nuclear Magnetic Resonance Spectroscopy, in: F. Bergaya, B.K.G. Theng, G. Lagaly (Eds.), Handb. Clay Sci., Elsevier, 2006: pp. 919–938. https://doi.org/10.1016/S1572-4352(05)01033-0.10.1016/S1572-4352(05)01033-0 ↗
36. Kinetics of hydrolysis and self condensation reactions of silanes by NMR spectroscopy10.1016/j.colsurfa.2007.06.028 ↗
37. Baseline studies of the clay minerals society source clays: thermal analysis10.1346/CCMN.2001.0490509 ↗
38. Kaolinite-ionic liquid nanohybrid materials as electrochemical sensors for size-selective detection of anions10.1039/c2jm34772e ↗
39. From clay- to organoclay-film modified electrodes: tuning charge selectivity in ion exchange voltammetry10.1016/j.electacta.2004.03.012 ↗
40. Biosorption isotherms, kinetics and thermodynamics10.1016/j.seppur.2007.10.002 ↗