Synthesis, Characterization and Adsorptive Properties οf Organobentonites

Jović-Jovičić, Nataša; Milutinović-Nikolić, A.; Banković, Predrag; Dojčinović, Biljana; Nedić, B.; Gržetić, Ivan; Jovanović, Dušan

doi:10.12693/aphyspola.117.849

Cited by 23 publications

(3 citation statements)

References 20 publications

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“…It is interesting to note that the modified samples, i.e., BCH, LCH, or LCAH possess two distinct vibration bands at 2925 and 2850 cm −1 that are associated with the asymmetric and symmetric C-H stretching vibrations of the -CH2 group, respectively. A band at 1480 cm −1 is assigned to the bending mode of the CH2 group [26,29,30]. This confirms the introduction of the HDTMA molecule within the clay network of all these modified solids.…”

Section: Characterization Of Hybrid Materialsmentioning

confidence: 69%

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: 69%

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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“…1 The previous studies of this group have shown that the incorporation of QAC in the different amounts corresponding to the cation exchange capacity (CEC) of smectite leads to the formation of different molecular arrangements, depending on the structure and QAC alkyl chain length. 16,[25][26][27] Short-chain QAC dominantly forms monolayers with characteristic d 001 ≈ 1.4 nm, while longer chain QAC make bilayers structure (d 001 ≈ 1.8 nm) with the alkyl chain axes parallel to the silicate layers. 1 Pseudo-trimolecular arrangement structures of kinked alkyl chains are observed with highly charged smectites and/or long surfactant cations and exhibit d 001 ≈ 2.2 nm.…”

Section: Xrd Analysismentioning

confidence: 99%

Electrochemical properties of carbonized bentonite

Jović-Jovičić

Bajuk‐Bogdanović

Novaković

et al. 2023

JSCS

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Organomodified bentonites were obtained by modification of bentonite clay from local mine Bogovina with four different alkylammonium ions in the amounts that correspond to cation exchange capacity. Carbonized bentonites, obtained by pyrolyzing the organomodified bentonites in the flow of nitrogen, were characterized using the XRD, low-temperature N2 physisorption, and Raman spectroscopy. Structural and textural properties of carbonized bentonites depended on the arrangement of alkylammonium cations in the paternal organomodified bentonite, while the Raman spectroscopy confirmed the presence of amorphous carbon. The obtained carbonized bentonites were used for modification of the carbon paste electrode. The modified electrodes were investigated using cyclic voltammetry and electrochemical impedance spectroscopy. The electrosorption of chloride and sulfate anions on carbonized bentonites was studied by chronocoulometry. The results were interpreted in the terms of surface groups and textural properties of the carbonized bentonites.

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“…Compared to polyaniline, as surface modifiers, CTAB seems to be favored. CTAB molecule for surface modification to create positive charge has been incorporated into zeolite [24], bentonite type clay [25], and silica [17][18][19][20][21][22][23]. The most silica modified with CTAB [17][18][19][20][21][22][23] was prepared from commercial material of tetra ethyl ortho silane (TEOS).…”

Section: Introductionmentioning

confidence: 99%

Modified Silica Adsorbent from Volcanic Ash for Cr(VI) Anionic Removal

et al. 2018

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In the present research, cetyltrymethyl ammonium bromide (CTAB)-modified silica from Kelud’s volcanic ash has been prepared and examined as adsorbent for removal of the hazardous Cr(VI) anion. The research was initiated with purification of SiO2 from the volcanic ash that was carried out by reacting the volcanic ash with NaOH powder at 900 °C for 2 h, followed by dissolving the ash to water at 100 °C, and then was acidified with HCl 1 M to form hydrogel. By calcination of the hydrogel, silica (SiO2) gel was obtained. The next step was modification of the silica with CTAB, that was performed by interacting the CTAB solution with the gel, in which the concentration of the CTAB was varied. Then the CTAB-modified silica samples were characterized by using FTIR, XRD, and SEM machines. The activity of the adsorbent was examined for adsorption of CrO4= in the solution. The results of the research demonstrate that the amorphous silica gel and the amorphous CTAB-modified silica have been obtained. The CTAB-modified silica was found to possess much higher ability in the adsorption of CrO4= anion, that was 48.90 mg/g, compared to that of the unmodified silica gel, as much 5.68 mg/g. These findings strongly prove that the negative surface of the CTAB-modified silica adsorbent has been successfully formed. Furthermore, it is also observed that increasing concentration of CTAB in SiO2-CTA can promote more effective adsorption of the CrO4= from the solution, but the further enlargement of the CTAB concentration leads to the adsorption decreased, and the highest adsorption was shown by CTAB-modified silica prepared with 0.10 mole of CTAB/1 mole SiO2.

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Synthesis, Characterization and Adsorptive Properties οf Organobentonites

Cited by 23 publications

References 20 publications

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

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

Electrochemical properties of carbonized bentonite

Modified Silica Adsorbent from Volcanic Ash for Cr(VI) Anionic Removal

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