Characterization and 2,4-D adsorption of sepiolite nanofibers modified by N-cetylpyridinium cations

Bakhtiary, Somayeh; Shirvani, Mehran; Shariatmadari, H.

doi:10.1016/j.micromeso.2012.09.022

Cited by 40 publications

(14 citation statements)

References 32 publications

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“…1) indicating a highly ordered structure of the nanocomposite (Giannakas et al 2008). (1,468 cm -1 ) related to the CTA surfactant (Wang and Wang 2008;Bakhtiary et al 2013) were observed on the FT-IR spectra of the surfactant-modified bentonite confirming the adsorption/intercalation of the CTA cations into the montmorillonite galleries. The absorption bands related to bending vibrations of Si-O-Si and Si-O-Al occurred at 469.6 and 520.7 cm -1 , respectively (Zohra et al 2008), but the position of the bands was slightly changed to lower wave numbers after modification of bentonite with CTA surfactant (Table 1).…”

Section: Xrd Patternsmentioning

confidence: 79%

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

2014

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We synthesized a novel poly acrylic acid-organobentonite (PAA-Bent) nanocomposite by successive intercalation of cetyltrimethylammonium (CTA) surfactant and polyacrylic acid (PAA) into the bentonite (Bent) interlayer spaces. The surfactant-modified clay (CTABent) and PAA-Bent nanocomposite were characterized by XRD and FT-IR techniques and used for removal of Pb(II) from aqueous solution. The XRD results confirmed the intercalation of CTA and PAA into the interlayer spaces of the bentonite increasing the d 001 spacing of the clay from 12.2 up to 38.9 Å . FT-IR analysis of the modified clay samples revealed the functional groups of CTA and PAA constituents alighted on the bentonite surfaces. Maximum Pb sorption capacity of the Bent and PAA-Bent predicted by Langmuir model were 52.3 and 93.0 mg g -1 , respectively, showing that the synthesized nanocomposite superiorly adsorbed Pb from the solution as compared to the Bent. The maximum Pb removal efficiency of 99.6 % was achieved by the nanocomposite at 25°C with \30 min contact time for a 7.5 g L -1 solid-to-liquid ratio and an initial metal concentration of 400 mg L -1 . The results indicated that PAA-Bent nanocomposite can be efficiently used as a superadsorbent for the removal of Pb(II) from aqueous solution.

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Section: Xrd Patternsmentioning

confidence: 79%

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

2014

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“…2. The diffractogram showing a sharp reflection peak at 2ϴ = 7.223 (12.1 Å) is a sepiolite characteristic peak (Li and Bowman 1997;Bakhtiary et al 2013). According to the studies of et al 2013) and Ozcan and Gok (2012) (Özcan and Gök 2012), structure of the modified clay with cationic surfactants does not have considerable difference with the bare one.…”

Section: Xrd Analysismentioning

confidence: 83%

“…1. The band at 3686.56 cm −1 that assigns to stretching ( OH) vibration of hydroxyl group (belong to Mg 3 OH) attached to octahedral Mg ions placed in the inner blocks of N-Sep and HDTMA-Sep (Bakhtiary et al 2013). The broadband at 3435.51 cm −1 attributed to H 2 O was observed at bare and treated sepiolite (Madejová 2003).…”

Section: Ftir Analysismentioning

confidence: 97%

Preparation and characterization of modified sepiolite for the removal of Acid green 20 from aqueous solutions: isotherm, kinetic and process optimization

et al. 2018

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In this study, adsorption of Acid green 20 (AG 20) by modified sepiolite, hexadecyltrimethylammonium-modified sepiolite (HDTMA-Sep), was optimized using response surface methodology based on a central composite design. Characteristics of natural sepiolite and modified sepiolite can be analyzed by FTIR and XRD techniques. In order to achieve a better comprehension of applicability of adsorbent for removing dyes from colored effluents, isotherm and kinetic studies were also carried out. The maximum dye removal of 78% and 72% for synthetic solutions and real wastewater, respectively, was obtained at the initial dye concentration of 77.1 mg/L, contact time of 24.81 min, solution pH of 6.19 and adsorbent dosage of 1.03 g/L. The kinetic studies revealed that the adsorption process followed pseudo-second-order model. The adsorption data were best fitted to Freundlich model. The result indicated that the contact time and dye concentration have more influence on the removal efficiency rather than pH and amount of adsorbent. The experimental data from this study indicated that the modified sepiolite is an efficient adsorbent for dye removal from aqueous solutions.

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“…This characteristic band was shifted to higher frequencies (1,671.9 cm −1 ) after the polymer was combined with the clay which can be related to the interactions between the C=O groups and the clay surfaces [44]. New absorption bands were detected at 2,850.2 and 2,919.7 cm −1 in the spectrum of CTA-Bent, which were assigned to stretching vibrations of C-H bond in -CH 2 and in -CH 3 group of the aliphatic chain of the CTA surfactant [40,45]. Additionally, the bending vibration of the methyl groups can be observed at 1,468.5 cm −1 , verifying the intercalation of surfactant molecules between the silicate layers [44,46].…”

Section: Sorbents Characteristicsmentioning

confidence: 95%

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

Rafiei

Shirvani

Ogunseitan

2016

Desalination and Water Treatment

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Characterization and 2,4-D adsorption of sepiolite nanofibers modified by N-cetylpyridinium cations

Cited by 40 publications

References 32 publications

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

Preparation and characterization of modified sepiolite for the removal of Acid green 20 from aqueous solutions: isotherm, kinetic and process optimization

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

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