Structural analysis of naproxen-intercalated bentonite (Unye)

Tabak, Ahmet Fatih; Yılmaz, Nurdane; Eren, Erdal; Çağlar, Bülent; Afsin, B.; Sarihan, Adem

doi:10.1016/j.cej.2011.09.027

Cited by 50 publications

(40 citation statements)

References 62 publications

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“…A broad peak at 3420 cm −1 belongs to the OH stretching of H-bonded water molecule(s). A vibration peak at 1640 cm −1 belongs to the OH deformational mode of water [28,29]. This clearly indicates the presence of hydroxyl groups within the clay sheets, while water molecules are present within the interlayer space of the clay.…”

Section: Characterization Of Hybrid Materialsmentioning

confidence: 90%

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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Due to health and pollution concerns of aquatic environments related to the presence of heavy metal toxic ions, the necessity of developing devices able to detect and to monitor such kinds of species has recently gained importance. Carbon paste electrodes (CPEs) a starting approach to obtain new ion-selective devices by supporting materials like bentonite and/or clay; which become sensitive to lead(II) when they are suitably modified by chemical treatments to obtain different hybrid materials. In this work, two natural clays and three different hybrid materials were produced and then were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy to assess their physico-chemical properties. After this stage, the electrochemical characterization of the modified CPEs using hybrid materials was performed by cyclic voltammetry, using the standard Fe(CN) 6 4− /Fe(CN) 6 3− redox couple. Subsequently, this study performed electrochemical experiments on lead(II) containing solutions, to test the ability of the examined CPEs to detect this toxic ion present in very low amounts. Lead(II) exhibited a reversible two electron oxidation/reduction behaviour in the cyclic voltammetry analyses and a reasonably good linear behaviour of the current associated with the oxidation peak as a function of its concentration (5.0-40.0 µg/L). The detection limit was found to vary in the range of 3-5 µg/L for the different modified CPEs. The presence of several co-existing ions showed that an interference variation had occurred. These results, therefore, show a restriction of the selectivity of the electrode up to a certain extent in the lead(II) detection. Finally, tap water with spiked lead(II) was analyzed to verify the suitability of the electrodes in the low level detection of lead(II) from real matrix samples.

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Section: Characterization Of Hybrid Materialsmentioning

confidence: 90%

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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“…Bentonite with the chemically reactive and high surface area has a wide range of industrial applications including clarification of edible and mineral oils, paints, cosmetic, and pharmaceuticals [9,18]. In addition to these, bentonite is acidic in nature; the acid sites can serve as centers of binding through the -NH 2 group of some compounds such as proteins, amino acids, amines [19][20]. However, attempts to use bentonite as a support for immobilization of lysozyme have not been reported.…”

Section: Introductionmentioning

confidence: 98%

Adsorption of lysozyme from aqueous solutions by a novel bentonite–tyrptophane (Bent–Trp) microcomposite affinity sorbent

Kalburcu

Tabak

Öztürk

et al. 2015

Journal of Molecular Structure

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“…In addition, thermal analysis results of the Rh-B/UB composite exhibits the increase in the thermal stability up to 750°C while Rh-B is stable in the temperature up to 200-220°C [29]. Also, an extra thermal stability of Rh-B/UB generates from the presence of π interactions between oxygen planes of the clay sheets and aromatic rings of the dye molecule as well as shielding effect of the alumina-silicate layers [23].…”

Section: Thermal Analysismentioning

confidence: 95%

“…3a and b, respectively. Depending on the CEC and water content of the material, the specific diffraction peak d(001) of montmorillonite clay minerals in bentonite is generally found in the range 14.0-15.0 Å [22,23]. In order to avoid the interference caused by adsorbed water, the samples used for this study were all dried at 105°C night long.…”

Section: Pxrd Analysismentioning

confidence: 99%