Hexavalent chromium removal from aqueous solution by adsorption on treated sawdust

Baral, Saroj Sundar; Das, Sonali; Rath, Prasenjit

doi:10.1016/j.bej.2006.08.003

Cited by 339 publications

(142 citation statements)

References 19 publications

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“…This is due to availability of more biosorbent sites as well as enhanced surface area [41]. The decrease in the rate of Cr (VI) uptake at adsorbent dose greater that 2 mg/L may be due to competition of the Cr (VI) ion for the sites available [42]. Similar results are also reported by researchers for a variety of batch experiments on sorption [29,36,[43][44][45].…”

Section: Effect Of Biosorbent Dosage On Cr (Vi) Uptakesupporting

confidence: 77%

Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel

Mandina¹

2013

IOSR-JAC

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of Cr (VI) ions increased with increase in contact time and remained constant after an equilibrium time of 180 min. The removal of Cr (VI) ions increased with increase in biosorbent concentration with the optimal adsorbent dosage at 4.0 mg/L. The increase in initial Cr (VI) ion concentration led to an increase in the percentage removal of Cr (VI). The adsorption data fitted well with the Freundlich isotherm model with

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Section: Effect Of Biosorbent Dosage On Cr (Vi) Uptakesupporting

confidence: 77%

Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel

Mandina¹

2013

IOSR-JAC

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“…The drop in adsorption capacity is basically due to the sites remaining unsaturated during the adsorption. Similar trend has also been reported by chromium (VI) adsorption onto sawdust [8]. The adsorption of silver ion onto blend chitosan-polyvinyl alcohol resin occurred due to free lone pairs electrons on the amino nitrogen are suitable for coordination with silver ion to give the corresponding adsorbent-metal complex [9].…”

Section: Adsorption Experimentalsupporting

confidence: 63%

“…where, B is a constant and F is the fractional attainment of equilibrium at time t in (8). International Journal of Environmental Science and Development, Vol.…”

Section: Kinetics Of Adsorptionmentioning

confidence: 99%

Kinetics Adsorption of Silver Ion by Blend Chitosan-Polyvinyl Alcohol Resin

Rakchaiyawan¹,

Kulratkitiwong²,

Piyamongkala³

2015

IJESD

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Abstract-Blend chitosan-polyvinyl alcohol resin as adsorbent of silver ion was studied. Batch kinetic experiments were carried out the dosage of adsorbent between 0.1-0.5 g and initial concentration of silver ion in range 20.0-100.0 mg/L. The experimental result showed that an increasing dosage of adsorbent and initial concentration of silver ion increased percent adsorption and adsorption capacity. The adsorption capacity of blend chitosan-polyvinyl alcohol resin at 0.5 g and 100 mg/L was 19.1 mg/g. The pseudo-first order and pseudo-second order were employed to evaluate the kinetic model. It was found that the pseudo-second order model was fit for describing the adsorption behavior. The mechanism of silver ion adsorption onto blend chitosan-polyvinyl alcohol resin occurred in 3 steps. The rate limiting step for mechanism of adsorption was film diffusion.

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“…As it is shown, the optimum pH of solution was observed at pH of 2 and by increasing pH, a drastic decrease in adsorption percentage was observed. This might be due to the weakening of electrostatic force of attraction between the oppositely charged adsorbate and adsorbent that ultimately lead to the reduction in sorption capacity (Baral et al, 2006 …”

Section: Effect Of Ph On Chromium Adsorptionmentioning

confidence: 99%

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Nameni

Moghadam

Arami

2008

Int. J. Environ. Sci. Technol.

172

115

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ABSTRACT:In this research, adsorption of chromium (VI) ions on wheat bran has been studied through using batch adsorption techniques. The main objectives of this study are to 1) investigate the chromium adsorption from aqueous solution by wheat bran, 2) study the influence of contact time, pH, adsorbent dose and initial chromium concentration on adsorption process performance and 3) determine appropriate adsorption isotherm and kinetics parameters of chromium (VI) adsorption on wheat bran. The results of this study showed that adsorption of chromium by wheat bran reached to equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Higher chromium adsorption was observed at lower pHs, and maximum chromium removal (87.8 %) obtained at pH of 2. The adsorption of chromium by wheat bran decreased at the higher initial chromium concentration and lower adsorbent doses. The obtained results showed that the adsorption of chromium (VI) by wheat bran follows Langmuir isotherm equation with a correlation coefficient equal to 0.997. In addition, the kinetics of the adsorption process follows the pseudo second-order kinetics model with a rate constant value of 0.131 g/mg.min The results indicate that wheat bran can be employed as a low cost alternative to commercial adsorbents in the removal of chromium (VI) from water and wastewater.

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Hexavalent chromium removal from aqueous solution by adsorption on treated sawdust

Cited by 339 publications

References 19 publications

Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel

Removal of chromium (VI) from aqueous solution using chemically modified orange (citrus cinensis) peel

Kinetics Adsorption of Silver Ion by Blend Chitosan-Polyvinyl Alcohol Resin

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

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