Equilibrium, kinetic and thermodynamic study of the biosorption of uranium onto Cystoseria indica algae

Khani, Mohammad Hassan; Keshtkar, Asghar; Ghannadi, M.; Pahlavanzadeh, Hassan

doi:10.1016/j.jhazmat.2007.05.010

Cited by 136 publications

(52 citation statements)

References 15 publications

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“…are surrounded by more cobalt ions and biosorption is carried out more sufficiently. Similar results are also reported by researchers for a variety of adsorbateadsorbent systems (Dahiya et al 2008;Khani et al 2008;Ahmadpour et al 2009). The rise of metal uptake by increasing initial metal ion concentration is as a result of the driving force of the concentration gradient, rather than the initial metal ion concentration (Ghorbani et al 2008).…”

Section: Studentized Residualssupporting

confidence: 90%

“…Increased biosorption of heavy metals with increasing temperature has been ascribed to cause rupture that possibly enhances the number of active sites involved in metal sorption or the affinity of sites for metal ions, respectively (Freitas et al 2009). However, the temperature effect seems to be contradictory, as reported by several authors: It can increase (Tsezos et al 1981;Kuyucak et al 1989), decrease (Khani et al 2008;Khani 2011;Bulgariu and Bulgariu 2012;Ghaedi et al 2013a), or keep the algae ability for metal sorption unaffected (Deng et al 2006;Freitas et al 2009;Ahmadpour et al 2009). The effects of initial cobalt (II) concentration and biomass dosage (BC) can be inferred from the response plot Fig.…”

Section: Studentized Residualsmentioning

confidence: 95%

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Study of cobalt (II) biosorption on Sargassum sp. by experimental design methodology

Soleymani

Khani

Pahlavanzadeh

et al. 2015

Int. J. Environ. Sci. Technol.

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In this study, the biosorption of cobalt (II) ions on Sargassum sp., brown algae, was investigated in a batch system. The combined effects of operating parameters such as biomass treatment, initial pH, temperature, initial metal ion concentration, and biosorbent dosage on the biosorption of cobalt (II) ions on Sargassum sp. were analyzed using response surface methodology. The Mg(NO 3 ) 2 was used as a pretreatment agent for Sargassum sp. The optimum biosorption conditions were determined as Mg-treated biomass, initial pH 7.0, temperature 45°C, biosorbent dosage 0.1 g, and initial cobalt (II) concentration 300 mg/l. At optimum biosorption conditions, the biosorption capacity of Mg-treated biomass for cobalt (II) ions was found to be 80.27 mg/g after 90-min biosorption. The Langmuir and Freundlich isotherm models were applied to the equilibrium data. The results are best fitted by the Freundlich model.

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Section: Studentized Residualssupporting

confidence: 90%

Section: Studentized Residualsmentioning

confidence: 95%

Study of cobalt (II) biosorption on Sargassum sp. by experimental design methodology

Soleymani

Khani

Pahlavanzadeh

et al. 2015

Int. J. Environ. Sci. Technol.

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“…Relation between DG°, DH°(enthalpy change) and DS°( entropy change) can be expressed by the following equation [35,36]:…”

Section: Thermodynamic Parameters Evaluationmentioning

confidence: 99%

Sorption behavior of some lanthanides on polyacrylamide stannic molybdophosphate as organic–inorganic composite

2016

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Sorption behavior of some lanthanide ions such as lanthanum and samarium ions on polyacrylamide stannic molybdophosphate {PASnMoP} as organic-inorganic composite has been investigated. ions on polyacrylamide stannic molybdophosphate was conducted. The adsorption isotherms were described by means of Langmuir and Freundlich isotherms for La 3? and Sm 3? ions. The Langmuir model represented the adsorption process better than the Freundlich model. The kinetic data were tested using Logergren-first-order and Pseudosecond-order kinetic models. The data correlated well with the Pseudo-second-order kinetic model, indicating that the chemical adsorption was the rate limiting step. Thermodynamic parameters DG°, DH°and DS°were also calculated and the data showed that the ion exchange of La 3?and Sm 3? ions on PASnMoP was spontaneous and endothermic in nature.

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“…In the last two decades, more studies have focused on using different microorganism to remove radionuclides from wastewaters. There are many biosorbents that have been used for uranium removal from water solutions (Kalin et al 2005a;Bayramoglu et al 2006;Parab et al 2005;Li et al 2004;Psareva et al 2005;Sar et al 2004;Genc et al 2003;Yang and Volesky 1999;Khani et al 2006Khani et al , 2008. These studies document that various biomasses from fungi, yeast, algae, and unicellular bacteria are capable of uptake or binding of uranium greater than 15% of biomass and dry weight.…”

Section: Introductionmentioning

confidence: 99%

“…A metal-loading capacity of greater than 15% of biomass and dry weight has been defined as an economic threshold for practical applications of biosorption compared to conventional methods (Kalin et al 2005b;Sar and D'Souza 2001). Studies on the biosorption of uranium onto brown algae pieces such as Cystoseria indica and Sargassum fluitans show promise in removal of uranium (Yang and Volesky 1999;Khani et al 2006Khani et al , 2008. Several species of marine brown algae including C. indica, Sargassum sp., Padina sp., etc.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis and isotherm study of uranium biosorption by Padina sp. algae biomass

Khani

2010

Environ Sci Pollut Res

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The optimum pH and initial uranium concentration in solutions, contact time and temperature were found to be 4.07, 778.48 mg/l, 74.31 min, and 37.47°C, respectively. Maximized uranium uptake was predicted and experimentally validated. The equilibrium data for biosorption of U onto the Padina sp. were well represented by the Langmuir isotherm, giving maximum monolayer adsorption capacity as high as 376.73 mg/g.

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Equilibrium, kinetic and thermodynamic study of the biosorption of uranium onto Cystoseria indica algae

Cited by 136 publications

References 15 publications

Study of cobalt (II) biosorption on Sargassum sp. by experimental design methodology

Study of cobalt (II) biosorption on Sargassum sp. by experimental design methodology

Sorption behavior of some lanthanides on polyacrylamide stannic molybdophosphate as organic–inorganic composite

Statistical analysis and isotherm study of uranium biosorption by Padina sp. algae biomass

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