The influence of pH on organovermiculite structure stability
Source abstract
Abstract
Abstract There is a large amount of research and application studies in the topic of organically modified vermiculites and their properties. In this work, the stability of two organovermiculites, one modified with hexadecyltrimethylammonium (HDTMA + ) and the other modified with hexadecylpyridinium (HDP + ) ions, was investigated at pH values from 1 to 14 at laboratory temperature. The organovermiculites in the pH range of 4–10 were stable. In addition, the HDTMA + -vermiculite was stable in strong alkaline media and under extreme acidic conditions as well. However, HDP + -vermiculite underwent significant decomposition when exposed to strong acidic or alkaline conditions (pH 1, 2 and 12, 14). The prepared and tested materials were investigated using X-ray diffraction (XRD) method, Fourier transform infrared (FTIR) spectrometry, total organic carbon content (TOC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The leaching of structural cations was determined as well.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Iron oxide chemistry and applications · Chemical Synthesis and Characterization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (32)
Show source-provided references
1. Organophilic clay minerals
2. Acid-activated organoclays: preparation, characterization and catalytic activity of polycation-treated bentonites10.1016/S0169-1317(98)00006-4 ↗
3. Acid-activated organoclays: preparation, characterization and catalytic activity of acid-treated tetraalkylammonium-exchanged smectites10.1021/la970507w ↗
4. Organoclays: properties, preparation and applications10.1016/j.clay.2008.02.006 ↗
5. Sorption of organic compounds of varying hydrophobicities from water and industrial wastewater by long- and short-chain organoclays10.1016/j.clay.2003.02.001 ↗
6. Changes in the morphology of organoclays with HDTMA+ surfactant loading10.1016/j.clay.2005.10.011 ↗
7. The effect of high pH alkaline solutions on the mineral stability of the Boom Clay—batch experiments at 60°C10.1016/j.apgeochem.2010.03.002 ↗
8. Acid Activation of Clay Minerals
9. Exfoliation properties of acid-activated montmorillonites and their resulting organoclays10.1021/la802533y ↗
10. Thermal stability investigation of organo-acid-activated clays by TG-MS and in situ XRD techniques10.1016/j.tca.2008.12.025 ↗
11. Reaction of acid activated montmorillonites with hexadecyl trimethylammonium bromide solution10.1016/j.clay.2008.10.006 ↗
12. Organo and inorgano-organo-modified clays in the remediation of aqueous solutions: an overview10.1016/j.clay.2012.02.006 ↗
13. Adsorption of acid dye from water onto pristine and acid-activated clays in fixed beds10.1016/j.jhazmat.2004.06.028 ↗
14. Adsorption of surfactants from water onto raw and HCl-activated clays in fixed beds10.1016/j.desal.2008.07.027 ↗
15. Near-infrared spectroscopy: a powerful tool in studies of acid-treated clay minerals10.1016/j.vibspec.2008.08.001 ↗
16. Degradation of surfactant-modified montmorillonites in HCl10.1016/j.matchemphys.2012.03.067 ↗
17. Study of ground and unground leached vermiculite10.1016/j.clay.2009.01.019 ↗
18. Influence of preparation method on the catalytic properties of acid-activated tetramethylamonium exchanged clays10.1016/S0926-860X(01)01001-8 ↗
19. Solid acidity of 2:1 type clay minerals activated by selective leaching10.1016/j.clay.2005.10.014 ↗
20. Alterations of the surface and morphology of tetraalkyl-ammonium modified montmorillonites upon acid treatment10.1016/j.jcis.2011.07.027 ↗
21. Study of ground and unground leached vermiculite: II. Thermal behaviour of ground acid-treated vermiculite10.1016/j.clay.2010.11.031 ↗
22. Preparation of organovermiculites using HDTMA: structure and sorptive properties using naphthalene10.1016/j.jcis.2008.08.026 ↗
23. Variations in the sorptive properties of organovermiculites modified with hexadecyltrimethylammonium and hexadecylpyridinium cations10.1166/jcp.2010.1006 ↗
24. Modeling and optimization process parameters of acid activation of bentonite by response surface methodology10.1016/j.clay.2009.11.043 ↗
25. Reaction kinetics of FEBEX bentonite in hyperalkaline conditions resembling the cement–bentonite interface10.1016/j.clay.2006.04.008 ↗
26. Modelling the interaction of bentonite with hyperalkaline fluids10.1016/S0883-2927(01)00078-6 ↗
27. Simha Martynková · 2010 · 119
28. Structural ordering of organovermiculite: experiments and modeling10.1016/j.jcis.2007.04.007 ↗
29. Preparation of porous silica from vermiculite by selective leaching10.1016/S0169-1317(02)00158-8 ↗
30. Theoretical and experimental investigations on the structures of purified clay and acid-activated clay10.1016/j.apsusc.2005.06.033 ↗
31. Yariv · 2002 · 688
32. Surface structure of CTMA+ modified bentonite and their sorptive characteristics towards organic compounds10.1016/j.colsurfa.2008.01.003 ↗