Removal of Cr(VI) from Aqueous Environments Using Micelle‐Clay Adsorption

Qurie, Mohannad; Khamis, Mustafa; Manassra, Adnan; Ayyad, Ibrahim; Nir, Shlomo; Scrano, Laura; Bufo, Sabino Aurelio

doi:10.1155/2013/942703

Cited by 35 publications

(21 citation statements)

References 22 publications

(33 reference statements)

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“…A 0.10 ml aliquot was collected and mixed with 0.20 ml of this ligand and 2 drops of 6.0 M sulfuric acid and the volume adjusted to 10 ml. The Cr(VI)-ligand complex was allowed to equilibrate for 10 min before measuring its absorbance at 540 nm [22]. ICP was used to determine total chromium in samples and standards using the method provided by the manufacturer.…”

Section: Methodsmentioning

confidence: 99%

Concurrent Removal and Reduction of Cr(VI) by Wool: Short and Long Term Equilibration Studies

Jumean

Khamis²,

Sara³

et al. 2015

AJAC

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Hexavalent chromium removal from wastewater using sheep wool was investigated at several equilibration periods. The influence of contact time, pH, adsorbent dosage and initial concentration was investigated. Adsorption isotherms for long and short periods were fitted to the Langmuir and Freundlich isotherms. For short contact times, the Langmuir adsorption isotherm was obeyed with no detectable change in the oxidation state but removal percentages did not exceed 90%. Long contact times resulted in more than 99% removal of Cr(VI). A 2-step mechanism for the removal is proposed. Free wool and wool loaded with Cr(VI) were characterized by FTIR and SEM.

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Section: Methodsmentioning

confidence: 99%

Concurrent Removal and Reduction of Cr(VI) by Wool: Short and Long Term Equilibration Studies

Jumean

Khamis²,

Sara³

et al. 2015

AJAC

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“…Previously reported experiments demonstrated the poor capability of AC filters toward removing anionic and some neutral pollutants [18,21,22,[25][26][27]31,32].…”

Section: Filtration Resultsmentioning

confidence: 99%

“…The complex was prepared as described elsewhere [18,[21][22][23][24][25][26][27][28]. The micelle-clay complex was obtained by stirring 12 mM of ODTMA with 10 g L −1 clay for 72 h.…”

Section: Micelle-clay Complex Preparationmentioning

confidence: 99%

“…It has been shown by X-ray diffraction, electron microscopy, and adsorption experiments that the material characteristics of the micelle-clay complex are different from those of an organo-clay complex, which is formed by adsorption of the same organic cations ODTMA as monomers [28]. Micelle-clay composites have already been proven to be efficient in the removal of about 20 neutral and anionic pollutants [18,[21][22][23][24][25][26][27]31,32].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

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Diazepam stability in wastewater and removal by advanced membrane technology, activated carbon, and micelle–clay complex

Sulaiman

Khamis

Nir

et al. 2014

Desalination and Water Treatment

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A B S T R A C TStability and removal of the anti-anxiety drug diazepam (valium) from spiked wastewater samples were studied. An advanced wastewater treatment plant (WWTP), utilizing ultrafiltration (UF), activated charcoal (AC), and reverse osmosis (RO) after the secondary biological treatment showed that UF and RO were relatively sufficient in removing spiked diazepam to a safe level. Kinetic studies in both pure water (abiotic degradation) and in sludge (biotic degradation) at room temperature were investigated. Diazepam showed high chemical stability toward degradation in pure water, and underwent faster biodegradation in sludge providing two main degradation products. The degradation reactions in sludge and pure water showed first-order kinetics with rate constant values of 2.6 × 10 −7 s −1 and 9.08 × 10 −8 s −1 , respectively (half-life = 31 and 88 d, respectively). Adsorption of diazepam by activated carbon and composite micelle-clay (octadecyltrimethylammonium montmorillonite) complex was studied using both Langmuir and Freundlich isotherms. Based on the determination coefficient, Langmuir isotherm was found to better fit the data, indicating the retention of diazepam monolayer on both adsorbents. Filtration of 100 mg L −1 solutions of diazepam by micelle-clay filter yielded almost complete removal at flow rates of 2 mL min −1 .

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“…Organo-clays have extended the technological applications of clays from barriers to biomedical uses, catalytic reactions, reinforcement of polymers, adsorption of anions, or nonpolar organic contaminants for wastewater treatment (Patel et al 2006;de Paiva et al 2008;Qurie et al 2013;Savas and Hancer 2015;Zhao et al 2017;Jayrajsinh et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Sorbent Materials Characterization Based on Mechanical or Thermal Pretreated Montmorillonite Modified by Surfactant Loading for Improved Chromium Retention

Morantes

Yarza

Montes

et al. 2020

Water Air Soil Pollut

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To improve hexavalent chromium (Cr(VI)) retention of montmorillonite (Mt) at pH 3, Mt sample was subjected to different treatments: thermal ones at 600 °C or 950 °C, 2 h, or mechanical grinding for 300 s. Then, the obtained products were loaded with different octadecyl trimethyl ammonium loading and 50% and 100% of Mt cation exchange capacity (CEC). The samples were characterized by several techniques at each stage. Differential thermogravimetric analysis (DTGA) performed on the products allowed determining the actual surfactant amount related to the internal or external surface by cation exchange and Van der Waals (VdW) mechanisms, respectively, taking into account the CEC of the thermal or mechanical pretreated Mt base sample used. X-ray diffraction (XRD) analyses revealed that the surfactant loading allowed the reversal of the collapsed interlayer after both treatments. The samples subjected to the thermal treatment at 600 °C and the raw Mt samples exhibit higher positive zeta potential values than the mechanical pretreated Mt ones with 100% of the CEC surfactant loaded at pH 3. This was directly related to the external surface covered by the surfactant. The agreement between the results of the surfactant coverage on the external surface and Cr(VI) removal at pH 3 indicates that the electrostatic mechanism is the main driving force for the sorption of Cr(VI). These synthesized sorbents achieve similar Cr(VI) retention using less than half the surfactant amount of already published studies.

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Removal of Cr(VI) from Aqueous Environments Using Micelle‐Clay Adsorption

Cited by 35 publications

References 22 publications

Concurrent Removal and Reduction of Cr(VI) by Wool: Short and Long Term Equilibration Studies

Concurrent Removal and Reduction of Cr(VI) by Wool: Short and Long Term Equilibration Studies

Diazepam stability in wastewater and removal by advanced membrane technology, activated carbon, and micelle–clay complex

Sorbent Materials Characterization Based on Mechanical or Thermal Pretreated Montmorillonite Modified by Surfactant Loading for Improved Chromium Retention

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