A surface complexation framework for predicting water purification through metal biosorption

Ngwenya, Bryne T.; Tourney, Janette; Magennis, Marisa; Kapetas, Leon; Olive, Valérie

doi:10.1016/j.desal.2008.05.074

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…Biosorption has emerged as an alternative sustainable strategy for cleaning up water that has been contaminated with toxic metals by anthropogenic activities and/or by natural processes [9]. It utilizes the properties of certain kinds of inactive or dead biomass to bind and accumulate these pollutants by different mechanisms, such as physical adsorption, chemisorption, complexation, ion exchange and surfacemicroprecipitation [10].…”

Section: Introductionmentioning

confidence: 99%

Nickel(II) biosorption by Rhodotorula glutinis

Suazo-Madrid

Morales-Barrera

Aranda-García

et al. 2010

J Ind Microbiol Biotechnol

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The present study reports the feasibility of using Rhodotorula glutinis biomass as an alternative low-cost biosorbent to remove Ni(II) ions from aqueous solutions. Acetone-pretreated R. glutinis cells showed higher Ni(II) biosorption capacity than untreated cells at pH values ranging from 3 to 7.5, with an optimum pH of 7.5. The effects of other relevant environmental parameters, such as initial Ni(II) concentration, shaking contact time and temperature, on Ni(II) biosorption onto acetone-pretreated R. glutinis were evaluated. Significant enhancement of Ni(II) biosorption capacity was observed by increasing initial metal concentration and temperature. Kinetic studies showed that the kinetic data were best described by a pseudo-second-order kinetic model. Among the two-, three-, and four-parameter isotherm models tested, the Fritz-Schluender model exhibited the best fit to experimental data. Thermodynamic parameters (activation energy, and changes in activation enthalpy, activation entropy, and free energy of activation) revealed that the biosorption of Ni(II) ions onto acetone-pretreated R. glutinis biomass is an endothermic and non-spontaneous process, involving chemical sorption with weak interactions between the biosorbent and Ni(II) ions. The high sorption capacity (44.45 mg g(-1) at 25°C, and 63.53 mg g(-1) at 70°C) exhibited by acetone-pretreated R. glutinis biomass places this biosorbent among the best adsorbents currently available for removal of Ni(II) ions from aqueous effluents.

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Section: Introductionmentioning

confidence: 99%

Nickel(II) biosorption by Rhodotorula glutinis

Suazo-Madrid

Morales-Barrera

Aranda-García

et al. 2010

J Ind Microbiol Biotechnol

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“…Nevertheless, the experimental results are usually inconsistent with the ion-exchange mechanism in the adsorption system without ionic state metals (the metals appearing in hydroxides or the complexation state) . Fourest and Volesky pointed out that the surface complexation also existed in metal binding with the biomass functional groups, and other researchers verified the mechanism of surface complexation. − Actually, the species of heavy metals in the solution often change with the variation of pH value; thus, the chemical interactions between heavy metals and functional groups are very complex. In addition to the ion-exchange and complexation, other pH-dependent interactions (e.g., hydrogen binding or the synergetic effects among ion-exchange, complexation, and hydrogen binding) should also be taken into account.…”

Section: Introductionmentioning

confidence: 99%

pH-Dependent Interactions Between Lead and Typha angustifolia Biomass in the Biosorption Process

Liu

Zeng

Jiang

et al. 2011

Ind. Eng. Chem. Res.

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Removal of heavy metals from wastewater by biosorption is an attractive approach. In this work, the interactions between lead and Typha angustifolia biomass, a cost-effective biosorbent, were investigated. It was found that the interactions between lead and T. angustifolia biomass were complex, and the solution pH was a key factor governing such interactions. The FTIR characterization and the results of blocking experiment indicate the amino, hydroxyl, and carboxyl are the main functional groups contributing to these interactions. A synergistic mechanism involving ion exchange, complexation, and hydrogen binding was elucidated. According to this mechanism, the dominant interactions between the biomass and lead altered with the variation of pH, which was consistent with the experimental results. Additionally, a simple method was explored to estimate the contributions of different interactions between the biomass and lead.

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“…(oxide or isobaric) were selected. Such care was necessary because some samples were 235 analysed alongside solutions containing mixtures of lanthanides, results of which will be 236 published elsewhere (Ngwenya et al, 2009). As a precaution against high Ba blanks, we also 237 routinely check for Ba oxide interference even during individual lanthanide analysis.…”

Section: Adsorption Edge Experiments 164mentioning

confidence: 99%