Selective adsorption of chromium(VI) in industrial wastewater using low-cost abundantly available adsorbents

Dakiky, M.; Khamis, Mustafa; Manassra, Adnan; Mer'eb, M.

doi:10.1016/s1093-0191(01)00079-x

Cited by 780 publications

(385 citation statements)

References 20 publications

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“…The slope and point of intersection in the graph of ln Kc versus 1/T help calculate ΔHº and ΔSº [23], [24].…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Removal of FD&C Red No.40 Food Dye from an Aqueous Solution by Vine-Trimming Waste

Sütçü¹

2014

IJCEA

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Abstract-The purpose of this study is to examine the removal of the food dye FD&C Red No.40 from an aqueous solution by means of vine-trimming waste. The adsorption experiments focused on the parameters such as contact time, pH of the aqueous solution, the amount of adsorbent, initial dye concentration and the temperature of the aqueous solution. Moreover, a study was carried out to make sure that the adsorption was in compliance with the Langmuir and Freundlich isotherm models and thermodynamic parameters were determined.Index Terms-Vine-trimming waste, food dye, adsorption.

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“…The slope and point of intersection in the graph of ln Kc versus 1/T help calculate ΔHº and ΔSº [23], [24].…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Removal of FD&C Red No.40 Food Dye from an Aqueous Solution by Vine-Trimming Waste

Sütçü¹

2014

IJCEA

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“…L'augmentation du taux de rétention du chrome hexavalent en fonction de l'augmentation de la masse de fibres est principalement due à un accroissement conséquent du nombre de sites actifs d'adsorption à la surface de la biomasse méditerranéenne. Cette même tendance a été rapportée par DAKIKY et al (2002) qui ont travaillé sur la biosorption de Cr (VI) sur laine, sciure de bois, aiguilles de pin, coques d'amandes et feuilles de cactus. …”

Section: Influence De La Quantité De Biomasseunclassified

Étude de la biosorption du chrome (VI) par une biomasse méditerranéenne : Posidonia oceanica (L.) delile

Ncibi

Mahjoub

Seffen³

2008

rseau

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Les fibres du végétal marin Posidonia oceanica (L.) ont été utilisées en tant que nouvel adsorbant biologique pour l’élimination du chrome hexavalent des solutions aqueuses artificiellement contaminées. Les expériences ont été effectuées en lots aussi bien pour les cinétiques que pour les isothermes d’adsorption. Les variables expérimentales étudiées sont le pH, la température, la quantité de biomasse et la concentration initiale de Cr(VI). Le maximum de biosorption a été observé pour un pH 2. La capacité de biosorption semble être optimisée par une augmentation de la température, de la quantité de biosorbant et de la concentration initiale. Les isothermes d’adsorption sont en accord avec les modèles de Redlich-Peterson et Langmuir. De plus, l’analyse thermodynamique a révélé que le présent processus d’adsorption est un phénomène favorable, endothermique et spontané.The marine biomass Posidonia oceanica (L.) fibres were used as a novel low cost biological adsorbent for the removal of hexavalent chromium from artificially contaminated aqueous solutions. Experiments were carried out for sorption kinetics and isotherms in a batch system. The operating variables studied were pH, temperature, biomass quantity and initial chrome concentration. The maximum adsorption removal was observed at pH 2. The biosorption capacity of P. oceanica fibres for Cr(VI) was enhanced by increasing the temperature, the biosorbent amount and initial chromium concentration. The isotherm adsorption data were satisfactorily found to be described by both Redlich-Peterson and Langmuir. Besides, the thermodynamic studies revealed that the present adsorption process is a favourable, endothermic and spontaneous phenomenon

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“…The positive value of ΔH° suggests that the interaction of Mn(II) adsorbed by Clay/Chitosan composite is endothermic process. Table (3), also shows that the ΔS° value was positive which revealed the increased randomness at the solid-solution interface during the process of adsorption [39,40] . Table 3 are determined from this graph).…”

Section: Langmaur and Freudlich Isothermmentioning

confidence: 83%

Characterization of Clay/Chitosan Nanocomposites and their Use for Adsorption On Mn(ΙΙ) from Aqueous Solution

El‐Kader¹,

Shehap²,

Bakr³

et al. 2015

IJSEA

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Abstract:: In this study, composites films were prepared from Chitosan biopolymer and Montmorillonite nanoclay (MMT) by dispersion of MMT into Chitosan solution with different weight percentage (2.5, 5, 7.5, 10, 12.5, 15 and 75% wt. /wt. nanoclay/chitosan), using both sonication and casting technique methods to obtain good dispersion of nanoclay. The structural properties of these nanocomposites samples examined by XRD and FTIR . The XRD patterns indicating that formation of an intercalated nanostructure as exfoliated and flocculated structure . Also the complexion of the dopant with the biopolymer was examined by FTIR studies. The experiments of Mn(ΙΙ) ions adsorption were carried out on MMT/chitosan nanocomposites. The effect of various parameters such as pH, contact time, adsorption mass, initial Mn(ΙΙ) concentration and temperature on the adsorption of Mn(ΙΙ) removal onto MMT/chitosan nanocomposites was investigated. Two adsorption isotherm models were applied Freundlich and Langmuir to fit the experimental data. Langmuir isotherm modeling was suitable for description the data at equilibrium state. The kinetic isotherm was found to follow the pseudo-second-order model. Also, the thermodynamics parameters of the adsorption such as Gibbs free energy∆ , entropy ∆ and enthalpy ∆ were discussed and the results demonstrate that the adsorption process is spontaneous and endothermic.

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Selective adsorption of chromium(VI) in industrial wastewater using low-cost abundantly available adsorbents

Cited by 780 publications

References 20 publications

Removal of FD&C Red No.40 Food Dye from an Aqueous Solution by Vine-Trimming Waste

Removal of FD&C Red No.40 Food Dye from an Aqueous Solution by Vine-Trimming Waste

Étude de la biosorption du chrome (VI) par une biomasse méditerranéenne : Posidonia oceanica (L.) delile

Characterization of Clay/Chitosan Nanocomposites and their Use for Adsorption On Mn(ΙΙ) from Aqueous Solution

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