Adsorption of Cr(VI) using thermally activated weed Salvinia cucullata

Baral, Saroj Sundar; Das, Sonali; Chaudhury, G. Roy; Swamy, Y.V.; Rath, Prasenjit

doi:10.1016/j.cej.2007.07.090

Cited by 86 publications

(47 citation statements)

References 24 publications

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“…Stirring speed 100-600 rpm was studied and 600 rpm was chosen to achieve kinetic parameter values, not affected by the stirring speed. This was comparable to the literature findings (Baral et al 2008). The reactor, containing 1 L aqueous Cr(VI) solution, was placed into a water bath to keep temperature constant at the desired level (23°C).…”

Section: Kinetic Studiessupporting

confidence: 48%

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

Sidiras

Politi

Batzias

et al. 2013

Int. J. Environ. Sci. Technol.

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In this work, a low-cost lignocellulosic adsorbent with high biosorption capacity is proposed, suitable for the efficient removal of hexavalent chromium from water and wastewater media. The adsorbent was produced by autohydrolyzing Scots Pine (Pinus Sylvestris) sawdust. The effect of the autohydrolysis conditions, i.e., pretreatment time and temperature, on hexavalent chromium biosorption was investigated using energy-dispersive X-ray spectroscopy (EDS) and UV-visible spectrophotometry. The Freundlich, Langmuir, Sips, Radke-Prausnitz, Modified Radke-Prausnitz, Tóth, UNILAN, Temkin and DubininRadushkevich adsorption capacities and the rate constant values for pseudo-first-and pseudo-second-order kinetics indicated that the autohydrolyzed material exhibits significantly enhanced hexavalent chromium adsorption properties comparing with the untreated sawdust. The Freundlich's adsorption capacity K F increased from 2.276 to 8.928 (mg g -1 )(L mg -1 ) 1/n , and the amount of hexavalent chromium adsorbed at saturation (Langmuir constant q m ) increased from 87.4 to 345.9 mg g -1 , indicating that autohydrolysis treatment at 240°C for 50 min optimizes the adsorption behavior of the lignocellulosic material.

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Section: Kinetic Studiessupporting

confidence: 48%

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

Sidiras

Politi

Batzias

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Nevertheless, there are also systems whose behaviour can be predicted well by Eq. (11) and the obtained k 1 values are independent of c in [123][124][125][126][127][128][129]. There exist approaches able to offer theoretical interpretation of the pseudo-first order equation in which k 1 is or is not a function of c in .…”

Section: The Pseudo-first Order Equationmentioning

confidence: 90%

“…However, there exist some exemplary systems [87,100,123] for which one can observe, as it was possible in the case of the pseudo-second equation, that Eq. (11) also does not seem to be much sensitive to the changes in the kinetic mechanism, influencing the kinetics of sorption.…”

Section: The Pseudo-first Order Equationmentioning

confidence: 94%

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

Płaziński

Rudziński

Płazińska

2009

Advances in Colloid and Interface Science

784

393

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“…activated carbon, fly ash, chitosan, zeolite, montmorillonite, sphagnum moss peat, kaolinite, wollastonite, bentonite, saw-dust, sea weeds, alumina, soya cake, redmud, etc. which have been frequently reported for the removal of metallic pollutants from aqueous solutions and wastewaters (Ayuso et al, 2007;Baral et al, 2008). Among them activated carbon is most promising, but its high cost always limits its large-scale application to developed nations (Acar and Malkoc, 2004).…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) from wastewater by adsorption on iron nanoparticles

et al. 2009

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Due to rapid industrialisation, the presence of heavy metals in water and wastewater is a matter of environmental concern. Though some of the metals are essential for our system but if present beyond their threshold limit value (TLV), they are harmful and their treatment prior to disposal becomes inevitable. The present communication has been addressed to the removal of Cr(VI) from aqueous solutions by nanoparticles of iron. Nanoparticles of iron were prepared by sol-gel method. The characterisation of the nanoparticles was carried out by XRD and TEM analysis. Batch experiments were adopted for the adsorption of Cr(VI) from its solutions. The effect of different important parameters such as contact time and initial concentration, pH, adsorbent dose, and temperature on removal of chromium was studied. The removal of chromium increased from 88. 5% to 99.05% by decreasing its initial concentration from 15 to 5 mg L −1 at optimum conditions. Removal of Cr(VI) was found to be highly pH dependent and a maximum removal (100%) was obtained at pH 2.0. The process of removal was governed by first and pseudo-second-order kinetic equations and their rate constants were determined. The process of removal was also governed by intraparticle diffusion. Values of the thermodynamic parameters viz. G • , H • , and S • at different temperatures were determined. The data generated in this study can be used to design treatment plants for chromium rich industrial effluents. Adsorption results indicate that nanoiron particles can be effective for the removal of chromium from aqueous solutions.A cause de l'industrialisation rapide, la présence de métaux lourds dans l'eau et dans les eaux usées est une question environnementale d'une importance cruciale. Même si certains métaux sont essentiels au bon fonctionnement de notre organisme, s'ils y sont présents dans une concentration supérieureà la valeur limite d'exposition (VLE), ils deviennent nocifs et leur traitement avantélimination devient inévitable. La présente communication traite de l'enlèvement du Cr(VI) présent dans les solutions aqueuses au moyen de nanoparticules de fer. Les nanoparticules de fer ontété obtenues au moyen du procédé sol-gel. La caractérisation des nanoparticules aété effectuée au moyen d'une analyse diffractométrique et d'une analyse par MET. On a effectué des essaisà renouvellement périodique pour mesurer l'adsorption de Cr(VI) dans les solutions où on en trouvait. L'effet de différents paramètres importants comme le temps de contact et la concentration initiale, le pH, la dose d'agent adsorbant ainsi que la température au moment de l'enlèvement du chrome ontétéétudiés. La proportion de chromeéliminée est passée de 88,5%à 99,05% en diminuant sa concentration initiale de 15à 5 mg/l, en conditions optimales. Il aétéétabli que l'élimination du Cr(VI) estétroitement liée au pH et l'élimination optimale (100%)été obtenueà un pH de 2,0. Le processus d'élimination aété régi par deséquations cinétiques du premier et du deuxième ordre et les constantes cinétiques ontété ...

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Adsorption of Cr(VI) using thermally activated weed Salvinia cucullata

Cited by 86 publications

References 24 publications

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

Efficient removal of hexavalent chromium from aqueous solutions using autohydrolyzed Scots Pine (Pinus Sylvestris) sawdust as adsorbent

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

Removal of Cr(VI) from wastewater by adsorption on iron nanoparticles

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