Testing of powder V er-Ag,Cu na nofillers . ... Preparation and characterization of antibacterial silver/vermiculites and silver/montmorillonites. Geochimica et Cosmochimicica Acta. 2010, ...Web
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Vermiculite is a natural phyllosilicate clay mineral with a 2:1 type layer crystalline structure that holds interlayer cations to maintain electrical neutrality. Although it has a similar sandwiched structure with other clay minerals (i.e., montmorillonite, illite, mica, sapolite, laponite), some of its structure features and properties are ...Web
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Vermiculites are widely used in different applications, for example as supports for different nanoparticles (e.g., Ag, Cu, and CeO 2), to prevent agglomeration of anchored particles. Another advantage is environmental, because migration of anchored nanoparticles from the final product is lower than that in case of loose nanoparticles [ 2, …Web
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In the initial state, compensating cations on S(0)V and S(5)V are mainly Ca 2+ and Mg 2+, and K + appears as poorly exchangeable in both vermiculites structures (Table 2). Note that the chemical compositions of the S(0) and S(5) solutions (Table 1 ) are added with Cs + at different concentrations for the adsorption step, while these solutions ...Web
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The reason for the preparation and characterization of the novel antibacterial silver/vermiculites (Ag/V) together with the silver/montmorillonites (Ag/M) was that the information on the ...Web
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The adsorption with both exfoliated vermiculites was well described by the DKR isotherm, indicative of a cooperative process and with the pseudo second order kinetic model. The Kd value for the two exfoliated vermiculites was similar, 0.2 ·1010 μg/Kg. ... (V, Co, Cu, Zn, Ga, As, Se, Rb, Sr, Zr, Nb, Ag, Cs, Tl, Pb, U) detected was less than 0.04.Web
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The reason for the preparation and characterization of the novel antibacterial silver/vermiculites (Ag/V) together with the silver/montmorillonites (Ag/M) was that the information on the vermiculite structure change and stability of Ag/V in water as well as its effect on bacteria are sporadic. The vermiculite (V), (Si 3.02 Al 0.98 ) IV (Mg 2.27 ...Web
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vermiculites is represented by Mg 3 (Si, Al) 4 O 10 ·4.5H 2 O [Mg] 0.35, in which [Mg] stands for exchangeable ions in the structure. Its structure can expand due to the absorption of water.Web
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Vermiculite is a popular soil additive for houseplants and garden plants that improves soil texture and helps to grow healthy plants. The main benefits of adding vermiculite to soil are better water …Web
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Most vermiculites when heated quickly to above 230 °C lose their interlayer water and this results in the flakes exfoliating to form concertina-shaped granules. ... Al, Ag, Hg and Pb) at low concentration. An investigation was also conducted regarding the efficiency of VMT-mag in reducing toxicity via ... (LC 50) from 5.80 (v/v) to 13.3 % (v/v ...Web
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Ag/montmorillonites and Ag/vermiculites was less commonly studied (Magaña et al., 2008; Valášková et al., 2010; Özdemir et al., 2010; Malachová et al., 2009). Özdemir et al. (2010) compared the antibacterial effect of Ag-, Cu- and Zn- forms of montmorillonite. The authors have found good antibacterial effect of Cu- and Ag-montmorillonite 1.Web
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Dioctahedral vermiculites show an interlayer space value d (060) between 0.149 nm and 0.150 nm, while ctahedral vermiculites have d (060) between 0.151 nm and 0.153 nm [11].Web
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The common grades are as follows: Light Grade: This grade of vermiculite has a low bulk density and is used for insulation, soil amendment, and as absorbents. It is also used for many of the commercial cultivation applications, such as hydroponic systems. Medium Grade: This grade is denser than Light Grade and is used for a variety of ...Web
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Semantic Scholar extracted view of "Preparation and characterization of antibacterial silver/vermiculites and silver/montmorillonites" by M. Valášková et al.Web
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The reason for the preparation and characterization of the novel antibacterial silver/vermiculites (Ag/V) together with the silver/montmorillonites (Ag/M) was that the …Web
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Original vermiculite and acidified vermiculites (formed at two different concentrations of hydrochloric acid solutions) were used as matrixes for precipitation and growth of silver nanoparticles. The precursor of silver for the Ag-vermiculites was silver nitrate solution. The vermiculite structure was studied by Infrared spectroscopy (IRS) and X-ray …Web
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The PLA was a biopolymer that was reinforced with four fillers (i.e., graphene oxide (GO) and silver (Ag); vermiculite (VMT) and silver (Ag); and two organically modified vermiculites). The ...Web
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Antibacterial properties of Ag- and Cu-vermiculites and combined Ag/Cu-vermiculites were tested on two bacteria groups: (1) Gram-positive, G+, (Staphylococcus aureus and Enterococcus faecalis) and (2) Gram-negative, G-, (Pseudomonas aeruginosa and Klebsiella pneumoniae). The samples under antibacterial testing showed different …Web
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The TG-DTA analyses of the Raw-V and Na-V samples are shown in Fig. 2.According to the curves in Fig. 2a, four stages for the Raw-V sample occurred when the heating temperature increased from 25 °C to 1000 °C.The first stage occurred from 25 °C to 88 °C with a mass loss of 4.36%, which could be attributed to the removal of water molecules adsorbed on …Web
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Two Ag/AgCl electrodes were inserted into both the source and drain reservoirs to measure proton current through the membranes. The representative I−V curves of ... vermiculites. Appl. Clay Sci ...Web
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Fig. 1 Schematic representation of osmotic swelling of natural vermiculites. (a) Photo of thermally expanded natural vermiculite. (b) Delamination yield observed by a one-step ion exchange with butylammonium chloride or citrate as compared to a two-step ion exchange first to Na + followed by butylammonium chloride. (c) Delamination yield observed by a …Web
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Vermiculite is a hydrous 2:1 phyllosilicate similar in structure to mica, but has a lower layer charge, and contains hydrated exchangeable cations in the interlayers versus …Web
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The reason for the preparation and characterization of the novel antibacterial silver/vermiculites (Ag/V) together with the silver/montmorillonites (Ag/M) was that the information on the ...Web
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Vermiculite has been used in various industries for over 80 years. It is used in the construction, agricultural, horticultural and industrial markets. Examples of products that contain vermiculite include potting soil mixes, loose fill insulation, and packing material. Protect Your Family from Asbestos-Contaminated Vermiculite Insulation.Web
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Samples Ag/V and Ag/M showed higher content of pores with radius 0.5-1.0 nm than original V and M. The Ag concentration was found higher in Ag/V than in Ag/M …Web
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Vermiculite is a hydrous 2:1 phyllosilicate similar in structure to mica, but has a lower layer charge, and contains hydrated exchangeable cations in the interlayers versus "non-exchangeable" K + in the interlayers of mica. Vermiculites occur in macroscopic and clay-sized forms.Web
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212 Criteria for defining the degree of regularity of alternation of different layer types (e.g. 1:1 or 2:1 layers) were recommended in criteria for interstratification nomenclatures [4,12]. The...Web
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Among the diverse classes of clay minerals exploited as natural absorbents, smectitic 2:1 clays such as vermiculite have demonstrated high efficiency at sequestering metal cations such as Ag + and Cu 2+ from aqueous solutions [13,14,15]. Vermiculites are hydrated magnesium–iron–aluminum silicates that typically exist as shiny flakes.Web
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The maximum adsorption capacity of vermiculite was determined (for Ag(I) ... Vermiculites are shimmering flakes with a porous structure and metallic gloss. The individual layers are separated by a thin air gap. In most cases, the particle colour of the mineral is usually golden-yellow or brown, occasionally tinted greenish. Vermiculite …Web
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In the mineralogical, as opposed to the commercial commodity sense, vermiculite is a precisely defined name for a group of 2:1 phyllosilicates with a layer charge of between 0.6 and 0.9 per O 10 (OH) 2 formula unit (Bailey, 1980; Guggenheim et al., 2006).On this basis vermiculites are distinguished from smectites with lower layer …Web
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CLAY MINERALS. D.G. Schulze, in Encyclopedia of Soils in the Environment, 2005 Vermiculites. Vermiculite has a 2:1 layer structure as described for mica, but, instead of having a layer charge of ∼1 per formula unit and K + in interlayer positions, vermiculite has a layer charge of 0.9–0.6 per formula unit and contains hydrated exchangeable cations, …Web
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Results of SSA measurement showed increase in SSA after vermiculites acid treatment. The SSA of V increased from 14 m2. g-1 to 149 m2. g-1 at Va05 and to 665 m2. g-1 at Va1. After reduction of ...Web
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Original vermiculite and acidified vermiculites (formed at two different concentrations of hydrochloric acid solutions) were used as matrixes for precipitation and growth of silver …Web
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The amounts of the metal ions adsorbed q (mg/g), were calculated from the dependence: (1) q = C 0 − C t V m where C 0 C t ais the initial metal ions concentration (mg/dm 3), Ct is the retained metal ions concentration (mg/dm 3) in solution at time t, V is the solution volume (dm 3), and m is the weight of the adsorbent (g). 2.3.3. Statistical ...Web
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Vermiculite (V) from Brazil with aqueous solutions AgNO3 and/or Cu(NO3)2 was used for preparation of nanocomposites V/Ag, V/Cu, V/AgCu and V/CuAg using two procedures and their effect on bacteria was compared. Structural changes were evaluated using X-ray diffraction (XRD) analysis, Infrared spectroscopy (IRS) and Scanning electron …Web
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Starting vermiculites with high K+ content in the interlayer have more interstratified phases and lower water content and are less crystalline. The crystallinity loss of vermiculite and therefore the structural disorder increase are caused by the structural water loss. ... Toksoy-Koksal F, Turkmenoglu AG, Goncuoglu MC. Vermiculitization of ...Web
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