Near-infrared spectroscopy as an effective tool for monitoring the conformation of alkylammonium surfactants in montmorillonite interlayers

Madejová, Jana; Sekeráková, Ľudmila; Bizovská, Valéria; Slaný, Michal; Jankovič, Ľuboš

doi:10.1016/j.vibspec.2016.02.010

Cited by 47 publications

(21 citation statements)

References 34 publications

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“…However, it should be noted that according to some previous studies, vermiculites treated with organic cations usually still contain unmodified layers [4,32]. This condition is mostly due to the formation of a hydrophobic barrier at the edges of large-sized crystals, which makes it difficult for the hydrated inorganic cations to diffuse out of the interlayer space [42,43]. Thus, some interlayer spaces may not be completely filled with organic cations, or interlayer spaces with exchangeable inorganic cations may remain.…”

Section: Discussionmentioning

confidence: 99%

“…The peaks relating to O-H stretching vibration and bending vibration also declined [47]. These changes are caused by a decrease in the amount of water in the mineral interlayer space, which is associated with the hydrophobization of its surface and the greater size of the organic cations compared to the inorganic ones originally present in the mineral [43,46].…”

Section: Ftirmentioning

confidence: 97%

“…Bands occurring in the 2920-2850 cm −1 range are the result of symmetrical and asymmetric C-H stretching vibrations occurring within the methylene groups of HDTMA [18,39,41]. The characteristic bands observed at around 1470 cm −1 are derived from bending vibrations of C-H within the methyl groups of the surfactant [26,[42][43][44]. The presence of HDBA was revealed by the presence of bands at the following positions: 2923, 2853, and 1450 cm −1 [45].…”

Section: Ftirmentioning

confidence: 99%

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Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

et al. 2019

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Among the various technologies tested for removing the anionic species resulting from arsenic contamination, sorption methods have received unflagging interest. Being potential sorbent materials, clay minerals modified by cationic surfactants are often examined for this purpose. Among the clay minerals tested, information regarding sorption properties of expanded vermiculite modified with surfactants is scarce. Therefore, the present study aims to prepare organo-vermiculites modified with hexadecyltrimethylammonium (HDTMA) and benzyldimethylhexadecylammonium (HDBA) at surfactant concentrations of 0.5, 1.0, and 2.0 cation exchange capacity. Modified sorbents were identified and characterized using the analytical methods that can determine phase composition and textural properties of the samples. The sorption of As(III) and As(V) as a function of initial pH value, initial concentration of As(III, V), and initial dosage of sorbent was investigated. The results show that HDTMA and HDBA affect the properties of raw vermiculite. For instance, increase in the concentration of surfactants is often accompanied by a change in interlayer space or textural properties of vermiculite. It was observed that tested organo-minerals adsorbed As(V) to a greater extent compared to As(III). Various analytical studies were carried out and the results revealed the successful synthesis of organo-vermiculite. Moreover, the study also showed that the structure of organo-vermiculite has a significant impact on the uptake of As(III) and As(V) anions.In the last decades, various technologies for removing As from contaminated water have been investigated, such as oxidation, coagulation, ion exchange, precipitation, membrane filtration, biological treatment, and sorption [9][10][11]. However, most of these methods have drawbacks, including high costs, deficient removal, generation of waste products, or high reagent and energy requirement. Among the methods mentioned earlier, adsorption seems to be the most effective method [1,12]. For removal by adsorption technique, activated carbon, metal-organic frameworks, zeolites, bog iron ores, water treatment residuals, and activated alumina have been proven to be promising adsorbents for arsenic removal [13][14][15][16][17].Clay minerals are low-cost and nontoxic sorbents. Raw clays are able to sorb cations owing to their negatively charged surface; however, they display low sorption efficiency for negatively charged contaminants such as arsenic [18]. Nevertheless, clays can be chemically modified by organic surfactants, which change the charge on the clay surface from negative to positive [19]. The organo-clays are hydrophobic materials that can effectively sorb anions and organic compounds. Modified kaolinite, montmorillonite, and illite are the most popular clay minerals that are used as sorbents [20][21][22]. However, only a few studies have focused on using organo-vermiculites to sorb anions [23,24].Vermiculite is a 2:1 phyllosilicate mineral having a sandwiched structure with two tetrahedral shee...

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Section: Discussionmentioning

confidence: 99%

Section: Ftirmentioning

confidence: 97%

Section: Ftirmentioning

confidence: 99%

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Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

et al. 2019

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“…For copolymer SX-1 (Figure 8, red), the characteristic bands include the primary amide NH2 asymmetric stretching at 3353 cm −1 , and the symmetric stretching band of NH2 at 3159 cm −1 [25,26]. In the spectrum of the Na-MMT/SX-1 composite material (Figure 8, blue) there occurs an absorption band at 1618 cm −1 , assigned to the primary amide C=O stretching (CONH2), while the absorption band at 1400 cm −1 corresponds to COO-stretching, which suggests the successful incorporation of SX-1 into Na-MMT [27][28][29]. There are quaternary amine and amide as well as alcohol functionalities in SX-1; adsorption is expected to take place based on the ion-dipole interactions between the polar alcohol groups and the exchangeable cations of shale, as well as H-bonding, van der Waals interactions and entropy effects [30].…”

Section: Ft-ir Analysismentioning

confidence: 96%

The Inhibition Property and Mechanism of a Novel Low Molecular Weight Zwitterionic Copolymer for Improving Wellbore Stability

Slaný

Wang

et al. 2020

Polymers

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In this work, a novel low molecular weight zwitterionic copolymer for improving wellbore stability, which is expected to be an alternative to the current shale inhibitors, was obtained by copolymerization of tris hydroxyethyl allyl ammonium bromide (THAAB), 2-acrylamido-2- methyl propane sulfonic acid (AMPS) and acrylamide (AM), initiated by a redox initiation system in an aqueous solution. The copolymer, denoted as SX-1, was characterized by FT-IR, TGA-DSC, and GPC. Results demonstrated that the molecular weight of SX-1 was approximately 13,683 g/mol and it displayed temperature resistance up to 225 °C. Regarding the inhibition performance, evaluation experiments showed the hot rolling recovery of a Longmaxi shale sample in 2.0 wt % SX-1 solutions was up to 90.31% after hot rolling for 16 h at 120 °C. The Linear swelling height of Na-MMT artificial core in 2.0 wt % SX-1 solution was just 4.74 mm after 16 h. Methods including particle size analysis, FTIR, XRD, and SEM were utilized to study the inhibition mechanism of SX-1; results demonstrated that SX-1 had entered into the inner layer of sodium montmorillonite (Na-MMT) and adsorbed on the inner surface, and the micro-structure of Na-MMT was successfully changed by SX-1. The particle size of Na-MMT in distilled water was 8.05 μm, and it was observed that its size had increased to 603 μm after the addition of 2.0 wt % of SX-1. Its superior properties make this novel low molecular weight copolymer promising for ensuring wellbore stability, particularly for high temperature wells.

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“…The intercalation of aliphatic organic carbon in 2:1 layered clay minerals has been reported in pure standards and natural clays extracted from sediments. 25,26 Overall, 8 two analytical methods (XRD and DRIFT spectroscopy) confirm a clay mineral is successfully synthesized in the presence of central metabolites such as acetate, malate, and succinate.…”

Section: Resultsmentioning

confidence: 99%

Catalyzed Synthesis of Zinc Clays by Prebiotic Central Metabolites

Zhou

Basu

Hartman³

et al. 2016

Preprint

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How primordial metabolic networks such as the reverse tricarboxylic acid (rTCA) cycle and clay mineral catalysts coevolved remains a mystery in the puzzle to understand the origin of life. While prebiotic reactions from the rTCA cycle were accomplished via photochemistry on semiconductor minerals, the synthesis of clays was demonstrated at low temperature and ambient pressure catalyzed by oxalate. Herein, the crystallization of clay minerals is catalyzed by succinate, an example of a photoproduced intermediate from central metabolism. The experiments connect the synthesis of sauconite, a model for clay minerals, to prebiotic photochemistry. We report the temperature, pH, and concentration dependence on succinate for the synthesis of sauconite identifying new mechanisms of clay formation in surface environments of rocky planets. The work demonstrates that seeding induces nucleation at low temperatures accelerating the crystallization process. Cryogenic and conventional transmission electron microscopies, X-ray diffraction, diffuse reflectance Fourier transformed infrared spectroscopy, and measurements of total surface area are used to build a three-dimensional representation of the clay. These results suggest the coevolution of clay minerals and early metabolites in our planet could have been facilitated by sunlight photochemistry, which played a significant role in the complex interplay between rocks and life over geological time.One of the major scientific questions that remains unresolved is how the origin of life occurred 1 . Within the prebiotic chemistry context of this interdisciplinary problem, recent work has shown the potential of ZnS promoted photocatalysis to harvest sunlight energy into chemical bonds 2 . The mechanism of semiconductor promoted photochemistry may have played a major role in cycling small organic compounds essential for the origin of life 3 . For example, illuminated ZnS has successfully driven several reactions of the reverse tricarboxylic acid cycle (rTCA) 3 , which is central to metabolism. Our latest work explored in detail the photoreduction of fumarate to succinate on the surface of ZnS 4 , which proceeds with a 95% yield 5 . The synergistic interaction between sunlight, photocatalysis, and organic acids in the prebiotic Earth 6, 7 could have promoted reactions otherwise not favoured, providing the foundation for present complex metabolism 3 . Within the origin of life framework, a separate but relevant problem is the potential role of clay minerals, strong adsorbents of polar organic molecules 8 , to facilitate abiogenesis 9 . The catalytic power of clays can promote the polymerization of biomolecules and the conversion of fatty acid micelles into vesicles 9 . Indeed, the process of clay formation is key for developing an understanding of the possible roles of these minerals in the origin of life 10 . Recent work has proven the crystallization of saponite clays can proceed easily in only 20 h under relatively mild conditions in the presence of urea 11 as a catalyst. Interesting...

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Near-infrared spectroscopy as an effective tool for monitoring the conformation of alkylammonium surfactants in montmorillonite interlayers

Cited by 47 publications

References 34 publications

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

The Inhibition Property and Mechanism of a Novel Low Molecular Weight Zwitterionic Copolymer for Improving Wellbore Stability

Catalyzed Synthesis of Zinc Clays by Prebiotic Central Metabolites

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