A superior adsorbent of CTAB/H2O2 solution−modified organic carbon rich-clay for hexavalent chromium and methyl orange uptake from solutions

Mobarak, Mohamed; Selim, Ali Q.; Mohamed, Essam A.; Seliem, Moaaz K.

doi:10.1016/j.molliq.2018.02.014

Cited by 62 publications

(42 citation statements)

References 85 publications

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“…In addition, if the adsorption process is reversible, the adsorbent can be regenerated by a suitable desorption process. [5] Many adsorbents have been developed to eliminate Cr(VI) from wastewater, in particular, activated carbons, [6] zeolites, [7] clays, [8] nanomagnetic particles, [9,10] photocatalytic nanocomposites, [11] biosorbents [12] and silica materials. [13] However, some of these materials are expensive and difficult to dispose of after use.…”

Section: Introductionmentioning

confidence: 99%

Carbohydrate-supramolecular gels: Adsorbents for chromium(VI) removal from wastewater

Rizzo

Andrews

Steed

et al. 2019

Journal of Colloid and Interface Science

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Francesca (2019) 'Carbohydrate-supramolecular gels : adsorbents for chromium(VI) removal from wastewater.', Journal of colloid and interface science., 548 . pp. 184-196. Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractHypothesis. To overcome the contamination of water by heavy metals the adsorption of the pollutant on gel phases is an attractive solution since gels are inexpensive, potentially highly efficient and form a distinct phase while allowing diffusion of the contaminated water throughout the material. This work tests the chromium(VI) adsorbent capacity of new supramolecular gels for Chromium(VI) removal from wastewater.Experiments. First hydrophobic imidazolium salts of carbohydrate anions were synthesised as new gelators. Subsequently, they were dissolved in a solvent by heating and, after cooling overnight, to give the formation of supramolecular gels. The properties of the resulting gels, such as thermal stability, mechanical strength, morphology, rheology, and kinetics of gel formation, were studied as a function of gelator structure, gelation solvent and pollutant removal efficiency.Findings. Carbohydrate-derived gels showed the best removal capacity, i.e. 97% in 24 h.Interestingly, in one case, the reduction of chromium(VI) to chromium(III) also occurred after the adsorption process, and this phenomenon has been analysed using 1 H NMR spectroscopy, IR spectroscopy, and SEM. The most efficient gel can reach an adsorption capacity of 598 mg/g in contrast to a value of 153 mg/g for the most effectively best hydrogels reported to date. The new gel can be also recycled up to 4 times. These findings suggest that these new, supramolecular hydrogels have potential applications in environmental remediation.

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Section: Introductionmentioning

confidence: 99%

Carbohydrate-supramolecular gels: Adsorbents for chromium(VI) removal from wastewater

Rizzo

Andrews

Steed

et al. 2019

Journal of Colloid and Interface Science

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“…The formed bands at 1815 and 1643 cm −1 were corresponding to the carbonate CO 3 2− group vibration and the -OH deformation of adsorbed H 2 O molecules on the surfaces of the crystallized Mn-mica, respectively [5,31,33]. The identified band at about 1020 cm −1 is associated with the Si-O stretching vibrations [11]. The absorption bands at 650, 798, and 819 cm −1 could be related to the Mn-O lattice vibrations [34].…”

Section: Isotherm Model Equation Parametersmentioning

confidence: 93%

“…The absorption bands at 650, 798, and 819 cm −1 could be related to the Mn-O lattice vibrations [34]. The bands at 540 and 469 cm −1 were related to the Si-O-Al and Si-O-Si bending vibrations, respectively [11].…”

Section: Isotherm Model Equation Parametersmentioning

confidence: 96%

“…In addition, MO is considered as a cancer-causing compound due to the existence of aromatic rings in its structure [10]. Therefore, precipitation, flocculation/coagulation, membrane filtration, photocatalysis, and adsorption were applied to treat the MO-polluted water [11]. Water remediation through the adsorption process was touted to be simple, promising, and economic [12].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Theoretical Studies of Methyl Orange Uptake by Mn–Rich Synthetic Mica: Insights into Manganese Role in Adsorption and Selectivity

et al. 2020

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Manganese–containing mica (Mn–mica) was synthesized at 200 °C/96 h using Mn–carbonate, Al–nitrate, silicic acid, and high KOH concentration under hydrothermal conditions. Mn–mica was characterized and tested as a new adsorbent for the removal of methyl orange (MO) dye from aqueous solutions. Compared to naturally occurring mica, the Mn–mica with manganese in the octahedral sheet resulted in enhanced MO uptake by four times at pH 3.0 and 25 °C. The pseudo–second order equation for kinetics and Freundlich equation for adsorption isotherm fitted well to the experimental data at all adsorption temperatures (i.e., 25, 40 and 55 °C). The decrease of Langmuir uptake capacity from 107.3 to 92.76 mg·g−1 within the temperature range of 25–55 °C suggested that MO adsorption is an exothermic process. The role of manganese in MO selectivity and the adsorption mechanism was analyzed via the physicochemical parameters of a multilayer adsorption model. The aggregated number of MO ions per Mn–mica active site ( n ) was superior to unity at all temperatures signifying a vertical geometry and a mechanism of multi–interactions. The active sites number (DM) of Mn–mica and the total removed MO layers (Nt) slightly changed with temperature. The decrease in the MO adsorption capacities (Qsat = n·DM·Nt) from 190.44 to 140.33 mg·g−1 in the temperature range of 25–55 °C was mainly controlled by the n parameter. The results of adsorption energies revealed that MO uptake was an exothermic (i.e., negative ΔE values) and a physisorption process (ΔE < 40 kJ mol −1). Accordingly, the adsorption of MO onto Mn–mica was governed by the number of active sites and the adsorption energy. This study offers insights into the manganese control of the interactions between MO ions and Mn–mica active sites.

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“…The association significantly affects on the spectral and luminescent properties of different systems. For example, the ionic association with the participation of dyes finds a fruitful application for the quantitative determination of metal ions, surfactants and organic additives [4][5][6]. Features of the association are also investigated in the biomedical industry, in pharmaceutical chemistry in order to determine the components in drugs or modification of DNA and polypeptides [7,8].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration

Shapovalov

Ponomariov

2019

ILCPA

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Interactions of sulforhodamine B or ethyl eosin (as the anionic dye) with cetylpyridinium bromide (as a cationic surfactant) have been investigated by visible spectroscopy in aqueous solution. The object of research is the association between an anion of dye and of cationic surfactant in aqueous solutions and its features. Computer simulation of these interactions was carried out with the use of AM1 and PM3 semi-empirical methods. A new spectrophotometric method was developed for determination of critical micelle concentration of cationic surfactants.

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A superior adsorbent of CTAB/H2O2 solution−modified organic carbon rich-clay for hexavalent chromium and methyl orange uptake from solutions

Cited by 62 publications

References 85 publications

Carbohydrate-supramolecular gels: Adsorbents for chromium(VI) removal from wastewater

Carbohydrate-supramolecular gels: Adsorbents for chromium(VI) removal from wastewater

Experimental and Theoretical Studies of Methyl Orange Uptake by Mn–Rich Synthetic Mica: Insights into Manganese Role in Adsorption and Selectivity

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration

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