Metals biosorption by sodium alginate immobilizedChlorella homosphaera cells

Costa, Antônio Carlos Augusto da; Leite, Selma Gomes Ferreira

doi:10.1007/bf01033409

Cited by 100 publications

(32 citation statements)

References 12 publications

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“…A comparison with the adsorption capacities of the free biomass (see Figure 2b) shows that there was little or no loss of biomass efficiency caused by the immobilisation process. These results are consistent with those of Kuhn and Pfister (1989) and da Costa and Leite (1991) and confii that alginate entrapment does not decrease biomass adsorption capacity. This has been attributed to the very high porosity of the alginate matrix and the open lattice structure which allows metals or large molecules to penetrate to the immobilised cells [Smidsrod and Stjak-Braek, 19901 and is supported by the micrograph of the alginate biosorbent shown in Plate B, Figure 1.…”

Section: Electron Micrographssupporting

confidence: 82%

Immobilisation protocols and effects on Cadmium uptake by Rhizopus arrhizus Biosorbents

1993

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Section: Electron Micrographssupporting

confidence: 82%

Immobilisation protocols and effects on Cadmium uptake by Rhizopus arrhizus Biosorbents

1993

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“…Most studies of biosorption for metal removal have involved the use of either laboratory-grown microorganism or biomass generated by the pharmacology and food processing industries or wastewater treatment units (Tsezos and Volesky, 1981;Townsley et al 1986;Rome and Gadd, 1987;Macaskie, 1990;Costa and Leite, 1991;Rao et al 1993). Many aquatic microorganisms, such as bacteria, yeast and algae can take up dissolved metals from their surroundings onto their bodies and can be used for removing heavy metal ions successfully (Asku et al 1991).…”

Section: *Corresponding Authormentioning

confidence: 99%

Biosorption of heavy metals from waste water using Pseudomonas sp.

Hussein¹,

Ibrahim²,

Kandeel³

et al. 2004

Electron. J. Biotechnol.

161

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Biosorption experiments for Cr(VI), Cu(II), Cd(II) and Ni(II) were investigated in this study using nonliving biomass of different Pseudomonas species. The applicability of the Langmuir and Freundlich models for the different biosorbent was tested. The coefficient of determination (R 2 ) of both models were mostly greater than 0.9. In case of Ni(II) and Cu(II), their coefficients were found to be close to one. This indicates that both models adequately describe the experimental data of the biosorption of these metals. The maximum adsorption capacity was found to be the highest for Ni followed by Cd(II), Cu(II) and Cr(VI). Whereas the Freundlich constant k in case of Cd(II) was found to be greater than the other metals. Maximum Cr(VI) removal reached around 38% and its removal increased with the increase of Cr(VI) influent. Cu(II) removal was at its maximum value in presence of Cr(VI) as a binary metal, which reached 93% of its influent concentration. Concerning to Cd(II) and Ni(II) similar removal ratios were obtained, since it was ranged between 35 to 88% and their maximum removal were obtained in the case of individual Cd(II) and Ni(II). *Corresponding authorThe presence of heavy metals in aquatic environments is known to cause severe damage to aquatic life, beside the fact that these metals kill microorganisms during biological treatment of wastewater with a consequent delay of the process of water purification. Most of the heavy metal salts are soluble in water and form aqueous solutions and consequently cannot be separated by ordinary physical means of separation.Physico-chemical methods, such as chemical precipitation, chemical oxidation or reduction, electrochemical treatment, evaporative recovery, filtration, ion exchange, and membrane technologies have been widely used to remove heavy metal ions from industrial wastewater. These processes may be ineffective or expensive, especially when the heavy metal ions are in solutions containing in the order of 1-100 mg dissolved heavy metal ions/L (Volesky, 1990a; Volesky, 1990b). Biological methods such as biosorption/ bioaccumulation for the removal of heavy metal ions may provide an attractive alternative to physico-chemical methods (Kapoor and Viraraghavan, 1995).

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“…For the first 45 min, the biosorption uptake was rapid (43.7-79.6%), then it proceeds at a slower sorption rate and finally did not increase significantly up to 120 min. In the initial stages the removal efficiency of Cr(VI) at all concentrations increased rapidly due to the abundant availability of active binding sites on the biomass, and with gradual occupancy of these sites, the sorption became less efficient in the later stages (Costa and Leite, 1991). In fact, the biosorption kinetics of heavy metal ions consisted of two phases; an initial rapid phase where the biosorption was rapid and contributed significantly to the equilibrium biosorption, and a slower second phase whose contribution to the total metal biosorption was relatively small.…”

Section: Effect Of Contact Time and Initial Concentration Of Chromiummentioning

confidence: 99%

Chromium biosorption from aqueous environments by mucilaginous seeds of Cydonia oblonga: Thermodynamic, equilibrium and kinetic studies

2017

Global NEST Journal

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Hexavalent chromium Cr(VI) is one of the most toxic heavy metals in aqueous solutions, hence it is highly imperative to treat the wastewater containing Cr(VI) before its discharge. At present work, the rate of biosorption was studied under a variety of conditions, including initial Cr(VI) concentration (5-50 mg/L), amount of biosorbent (0.5-3 g/100 mL), pH (1-8), temperature (298-318 K) and contact time (30-120 min). Biosorption of Cr(VI) is in all cases pHdependent showing a maximum at equilibrium pH values between 2 and 3. The biosorption data fitted well with Langmuir and Freundlich isotherms. The biosorption capacity calculated from the Langmuir isotherm was q = 33.58 mg Cr(VI)/g of dry seeds (at 303 K). Biosorption kinetics data well fitted using pseudo-second-order. Thermodynamic studies confirmed that biosorption of Cr(VI) ions by mucilaginous seeds of Cydonia oblonga was spontaneous and endothermic nature.

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Metals biosorption by sodium alginate immobilizedChlorella homosphaera cells

Cited by 100 publications

References 12 publications

Immobilisation protocols and effects on Cadmium uptake by Rhizopus arrhizus Biosorbents

Immobilisation protocols and effects on Cadmium uptake by Rhizopus arrhizus Biosorbents

Biosorption of heavy metals from waste water using Pseudomonas sp.

Chromium biosorption from aqueous environments by mucilaginous seeds of Cydonia oblonga: Thermodynamic, equilibrium and kinetic studies

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