Biosorption of uranium from aqueous solutions by nonliving biomass of marine algae Cystoseria indica

Khani, Mohammad Hassan; Keshtkar, Asghar; Meysami, Behrouz; Zarea, Mohammad Firouz; Jalali, Reza

doi:10.2225/vol9-issue2-fulltext-8

Cited by 76 publications

(42 citation statements)

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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%

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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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Section: Introductionmentioning

confidence: 99%

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 chemically modified biosorbent increases the stability of the biosorbent material and enhances the biosorbent properties (Khani et al 2006). The interactive effect of initial cobalt (II) concentration and type of biomass on the cobalt uptake of biomass holding other variables at their central values is shown in Fig.…”

Section: Statistical Optimizationmentioning

confidence: 99%

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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“…This could be because the binding sites were limited and the remaining vacant surface sites were difficulty to be occupied by metal ions due to the formation of repulsive forces between metal ions on solid phase and the liquid phase [2]. The general observation was that the high rate of sorption was due to both chemisorptions and complexation while the slower phase may be due to saturation of the binding site and the subsequent attainment of equilibrium [115]. Mwangi et al…”

Section: Effect Of Contact Timementioning

confidence: 99%

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Bii¹,

Mwangi²,

Wanjau³

et al. 2016

J Pollut Eff Cont

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The dispersal of toxic heavy metals by water from natural and anthropogenic is a worldwide environmental concern due to pollution. Despite some metals playing an important role in body, they are toxic when the level exceeds the tolerance limits while others such as lead have no known physiological value to human beings. Since heavy metals cannot be degraded, then their removal from drinking water is necessary. Mushrooms are readily available in Bomet County and their metal removal ability was investigated. The study aimed at removing heavy metals from water by adsorption using mushroom, as a cost-effective and sustainable method. The raw mushroom was modified with sodium hydroxide and characterization of both the parent material and its modified form was done using Fourier Transform Infrared spectrometry (FTIR). Sorption experiments were carried out using the batch adsorption method and sorption parameters including pH, contact time, adsorbent dose and initial metal ion concentration investigated. The results found out that the sorption capacity for cadmium ions ranged from 1.826-25.285 mg/g by the unmodified edible mushroom (UEM), the modified edible mushroom (EM), unmodified toxic mushroom (UTM) and modified toxic mushroom (TM). For copper ions, sorption capacity ranged from 0.002-4.097 mg/g, while that of the lead ions ranged from 1.345-2.593 mg/g by the UEM, EM, UTM and TM respectively. The sorption capacity showed improvement on modification as sorption of cadmium increased from 1.826-25.285 mg/g by the UEM, EM, UTM and TM. At a pH range of 4-6, the sorbent material was found to remove up to 90% of the metals. The sorbent material had a removal efficiency of 95% of the metals in less than 20 minutes. The UEM and UTM fitted well in Langmuir adsorption isotherm model for cadmium and lead ions. For copper ions, UEM, EM, UTM and TM fitted in the Freundlich model. TM for lead ions best fitted in the Freundlich model. The bio-sorption kinetics was determined by fitting first-order-Lagergreg and Pseudo-second-order kinetics models to the experimental data. It was found that the data for lead was better described by the pseudo-second-order model. For copper ion, the data was best described by Ho's pseudo second order for UEM and UTM, cadmium ions for all sorbents was best described by Lagergreg's first-order kinetics. The FTIR analysis suggested the possibility of the participation of carboxyl groups in metal uptake. The levels of dissolved organic carbon (DOC) were found to be 19.0 mg/L in the raw material and 2.19 mg/L after modification. It was confirmed that modification minimized secondary pollution. This indicated that mushrooms have a potential application for the remediation of metal polluted waters.

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Biosorption of uranium from aqueous solutions by nonliving biomass of marine algae Cystoseria indica

Cited by 76 publications

References 0 publications

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

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

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

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

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