Structure and antibacterial properties of polyethylene/organo-vermiculite composites

Hundáková, Marianna; Tokarský, Jonáš; Valášková, Marta; Slobodian, Petr; Pazdziora, Erich; Kimmer, Dušan

doi:10.1016/j.solidstatesciences.2015.08.011

Cited by 24 publications

(10 citation statements)

References 54 publications

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“…Well-defined, narrow reflections correspond not only to the larger amount of surfactant on the vermiculite's surface, but also to the well-ordered crystal structure [24,26]. The differences observed with regard to the shape and position of the reflections, which depend on the type of modification, are in agreement with published studies about the influence of ammonium salt concentration on the intercalation process [30,36,[70][71][72].…”

Section: Discussionsupporting

confidence: 88%

“…The attractive forces between the interlayer organic cations and the highly charged silicate surfaces are greater in vermiculites than in smectites. Therefore, for larger organic cations (like HDTMA and HDBA used in this study), bilayers are formed in smectites whereas paraffin complexes are formed in vermiculites [24,26,36,[63][64][65][66][67]. The XRD results obtained in this study are similar to that reported in the literature data, which allows us to assume that during the modification of vermiculite, the paraffin-type arrangement occurs in the interlayer space of organo-vermiculites [24,31,68,69].…”

Section: Discussionsupporting

confidence: 86%

“…In the case of reflection at 38-39 Å , the intensity of reflection slightly increased with an increase in the added surfactant concentration, whereas for the reflection at 14 Å , the intensity of reflection decreased in case of 2.0 HDTMA (Figure 1c,d). This finding supports the fact that VER is almost fully saturated with HDTMA at 2.0 CEC and that the basal reflection of vermiculite disappears completely [36]. Additionally, most of the VER reflections disappear completely for 2.0 HDTMA.…”

Section: Modification Of Vermiculite With Hdtma and Hdbasupporting

confidence: 85%

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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: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 86%

Section: Modification Of Vermiculite With Hdtma and Hdbasupporting

confidence: 85%

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

et al. 2019

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“…Hundáková et al 15 investigated the structure and antibacterial properties of PE/OVMT composites. They observed that PE/OVMT composites can be used as an antibacterial compound and that the composites presented higher tensile modulus than PE.…”

Section: Introductionmentioning

confidence: 99%

Effect of the organically modified vermiculite clay loading on the rheological and flammability properties of biopolyethylene/vermiculite clay biocomposites

Hanken

Cavalcanti

Araújo

et al. 2019

Journal of Thermoplastic Composite Materials

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In this work, the effect of the vermiculite (VMT) clay loading on the rheological properties and flammability of bio-based high-density polyethylene/organically modified VMT (BioHDPE/OVMT) clay biocomposites containing 0.5–10 phr of OVMT clay was investigated. X-ray diffraction patterns showed that the BioHDPE was intercalated between the OVMT clay galleries. BioHDPE/OVMT biocomposites containing 5 and 10 phr of OVMT clay exhibited a shear-thinning behavior and a better dispersion/distribution in the BioHDPE matrix. The biocomposite containing 10 phr of organoclay presented a percolated network structure. The elastic modulus increased with the increase in the OVMT loading whereas the tensile and impact strength remained almost unaffected. For the biocomposites containing the unmodified VMT clay, the burning rate decreased with the increase in the VMT loading. The opposite was observed for the biocomposites containing OVMT clay.

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“…Preparation of PE/Ver-Ag,Cu samples PE samples were prepared by melt compounding at 160°C in Brabender kneader. The prepared mixtures of PE with nanofillers were pressed into the thin plates (125 × 125 × 1 mm) according the same conditions as in our previous works [14,15]. The prepared materials were labelled as PE/VerAg, PE/VerCu, PE/VerAgCu and PE/VerAgCu-b.…”

Section: Geoscience Engineeringmentioning

confidence: 99%

Vermiculite With Ag and Cu Used as an Antibacterial Nanofiller in Polyethylene/ Vermikulit S Ag A Cu Použitý Jako Antibakteriální Nanoplnivo V Polyethylenu

Hundáková¹,

Valášková²,

Samlíková³

et al. 2014

GeoScience Engineering

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Vermiculite (Ver) enriched with silver and copper was used as nanofiller to the polyethylene (PE) matrix. Specifically, the low density polyethylene (LDPE) was chosen as a matrix. The samples Ver-Ag,Cu were prepared by shaking of Ver with the aqueous solutions of silver and copper nitrate. The mixtures of the Ver nanofillers and PE were homogenized by melt compounding technique and further thin plates were pressed from stiff matter of PE with Ver nanofiller. The exfoliation of the powdery Ver nanofillers in PE matrix was characterized by the X-ray diffraction analysis of thin plates. Distribution of Ver nanofiller in PE matrix was observed by Light microscopy. The reinforcing effect of nanofillers onto PE matrix was studied by creep experiment. Antibacterial activity of powder Ver-Ag,Cu samples and surfaces of PE/Ver-Ag,Cu samples was tested on the Gram-positive bacteria Enterococcus faecalis. All tested PE/Ver-Ag,Cu surfaces showed good antibacterial behaviour after 24 h in comparison to pure PE. The number of colonies decreased from the countless number to several hundred colonies.

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Structure and antibacterial properties of polyethylene/organo-vermiculite composites

Cited by 24 publications

References 54 publications

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

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

Effect of the organically modified vermiculite clay loading on the rheological and flammability properties of biopolyethylene/vermiculite clay biocomposites

Vermiculite With Ag and Cu Used as an Antibacterial Nanofiller in Polyethylene/ Vermikulit S Ag A Cu Použitý Jako Antibakteriální Nanoplnivo V Polyethylenu

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