Proton and Cd adsorption onto natural bacterial consortia: Testing universal adsorption behavior

Borrok, David M.; Fein, Jeremy B.; Kulpa, Charles F.

doi:10.1016/j.gca.2004.02.003

Cited by 134 publications

(136 citation statements)

References 31 publications

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“…This is because the number of availabel adsorption sites decreased for CeNPs at 100 mg L −1 concentration due to aggregation at this high particle concentration. both methods are not inconsistent with typical functional groups of the cell surfaces described in previous reports [38,39].…”

Section: Adsorption Of Eps On Cenpssupporting

confidence: 76%

“…Consequently, the results of XPS analyses suggest that the EPS released from S. cerevisiae is composed of lipids, proteins, saccharides, amines, and orthophosphate, which is consistent with the results of FTIR. On the other hand, the functional groups of EPS determined by both methods are not inconsistent with typical functional groups of the cell surfaces described in previous reports [38,39].…”

Section: Characterization Of Epssupporting

confidence: 74%

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Adsorption of Extracellular Polymeric Substances Derived from S. cerevisiae to Ceria Nanoparticles and the Effects on Their Colloidal Stability

et al. 2017

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Abstract:In order to understand the adsorption preferences of extracellular polymeric substances (EPS) components derived from fungus Saccharomyces cerevisiae on sparingly soluble CeO 2 nanoparticles (CeNPs), the adsorption experiments of the EPS including organic matter with low molecular weight have been performed at pH 6.0 at room temperature (25 ± 1 • C). The subsequent effects of the coating on the dispersibility of CeNPs was systematically measured as a function of time and ionic strength ranging from 1 to 1000 mmol L −1 . Among the EPS and other components, orthophosphate and saccharides preferentially adsorb onto CeNPs, and proteins are the only major N-compounds adsorbing onto the CeNP surfaces. Adsorption of orthophosphate resulted in a dramatic decrease in ζ potential to −40 mV at pH > 5, whereas the EPS adsorption suppressed the deviation of ζ potential within a narrow range (−20-+20 mV) at pHs ranging from 3 to 11. Critical aggregation concentrations (CAC) of an electrolyte (NaCl), inorganic orthophosphate, and EPS solutions are 0.01, 0.14, and 0.25 mol L −1 , respectively, indicating that the EPS adsorption suppresses aggregation of CeNPs by the electrostatic repulsive forces derived from the adsorbed orthophosphate and the steric barrier formed by organic matter on the nanoparticle surfaces. Therefore, the EPS derived from fungus S. cerevisiae can potentially enhance colloidal dispersibility of CeNPs at circumneutral pH.

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Section: Adsorption Of Eps On Cenpssupporting

confidence: 76%

Section: Characterization Of Epssupporting

confidence: 74%

Adsorption of Extracellular Polymeric Substances Derived from S. cerevisiae to Ceria Nanoparticles and the Effects on Their Colloidal Stability

et al. 2017

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“…Several recent investigations have used surface complexation models (SCMs) to describe the extent of metal adsorption by bacteria as important physical, chemical, and biological parameters are independently varied (5,8,14,16,19,23,43). These SCMs are based upon a set of molecular-scale thermodynamic reactions, each describing adsorption of a particular dissolved chemical species to a particular type of cell wall functional group using a single stability constant, K. Some previous investigations indicate that different bacterial species display similar types of reactive surface functional groups (e.g., carboxyl, phosphoryl, hydroxyl, or amine) and exhibit broadly similar reactivities toward certain metals (5,43).…”

mentioning

confidence: 99%

Cadmium Ion Biosorption by the Thermophilic Bacteria Geobacillus stearothermophilus and G. thermocatenulatus

Hetzer

Daughney

Morgan

2006

Appl Environ Microbiol

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This study reports surface complexation models (SCMs) for quantifying metal ion adsorption by thermophilic microorganisms. In initial cadmium ion toxicity tests, members of the genus Geobacillus displayed the highest tolerance to CdCl 2 (as high as 400 to 3,200 M). The thermophilic, gram-positive bacteria Geobacillus stearothermophilus and G. thermocatenulatus were selected for further electrophoretic mobility, potentiometric titration, and Cd 2؉ adsorption experiments to characterize Cd 2؉ complexation by functional groups within and on the cell wall. Distinct one-site SCMs described the extent of cadmium ion adsorption by both studied Geobacillus sp. strains over a range of pH values and metal/bacteria concentration ratios. The results indicate that a functional group with a deprotonation constant pK value of approximately 3.8 accounts for 66% and 80% of all titratable sites for G. thermocatenulatus and G. stearothermophilus, respectively, and is dominant in Cd 2؉ adsorption reactions. The results suggest a different type of functional group may be involved in cadmium biosorption for both thermophilic strains investigated here, compared to previous reports for mesophilic bacteria.Various metal compounds can be either essential or toxic for living organisms, depending on the form and concentration. In important physiological catalytic reactions, many enzymes require metal ions as central atoms. In order to generate energy, several microorganisms depend on metal compounds that act as final electron acceptors during anaerobic respiration and as electron donors in chemolithotrophic metabolism. In contrast, nonessential metal ions, in particular, and metal ions (both nonessential and essential) at high concentrations, in general, harm the living cell by potentially displacing essential metal ions (in enzymes), competing with structurally related nonmetals in cell reactions and blocking functional groups in biomolecules (29). Therefore, organisms have developed several metal homeostasis and detoxification strategies, including an active efflux system, changes in ion permeability, adsorption, and intra-and extracellular complexation, biotransformation, and compartmentation (10,21,27,31,36).Adsorption of metals by cell wall components is one of the more important interaction mechanisms, and it has been the subject of many studies (for review, see references 3, 15, 20, 34, 35, and 40). Several recent investigations have used surface complexation models (SCMs) to describe the extent of metal adsorption by bacteria as important physical, chemical, and biological parameters are independently varied (5,8,14,16,19,23,43). These SCMs are based upon a set of molecular-scale thermodynamic reactions, each describing adsorption of a particular dissolved chemical species to a particular type of cell wall functional group using a single stability constant, K. Some previous investigations indicate that different bacterial species display similar types of reactive surface functional groups (e.g., carboxyl, phosphoryl, hydroxyl, or ...

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“…102 Furthermore, it is revealed that bacteria can adsorb cadmium by complexation. 119 Beveridge 120 has shown that the metal binding site in bacteria exists on the cell surface, i.e., cell wall, by using transmissionelectron microscope techniques. 121 The source of the strong organic ligands in the ocean is believed to be marine organisms, such as phytoplankton and bacteria.…”

Section: Chemical Properties Of Organic Ligands In Seawatermentioning

confidence: 99%

Chemical Speciation of Trace Metals in Seawater: a Review

Hirose¹

2006

ANAL. SCI.

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The recent development of the chemical speciation of trace metals in seawater is described. The speciation studies reveal that metal ion complexation is one of the most important processes in seawater; especially, most bioactive trace metals, such as Fe(III) and Cu, exist as complexes with ligands in dissolved organic matter. The organic ligands in seawater are characterized with metal ions selected by the HSAB concept. A strong organic ligand, which originates from marine microorganisms, is classified as a hard base including carboxylates. The free organic ligand concentrations in seawater are buffered by complexation with excess amounts of Ca and Mg in seawater. The chemical equilibrium model suggested that the concentrations of bioactive free metal ions are at an optimal level to activities of marine microorganisms. For chemical speciation, it is important to have a better understanding of the ecological roles of trace metals in seawater.

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Proton and Cd adsorption onto natural bacterial consortia: Testing universal adsorption behavior

Cited by 134 publications

References 31 publications

Adsorption of Extracellular Polymeric Substances Derived from S. cerevisiae to Ceria Nanoparticles and the Effects on Their Colloidal Stability

Adsorption of Extracellular Polymeric Substances Derived from S. cerevisiae to Ceria Nanoparticles and the Effects on Their Colloidal Stability

Cadmium Ion Biosorption by the Thermophilic Bacteria Geobacillus stearothermophilus and G. thermocatenulatus

Chemical Speciation of Trace Metals in Seawater: a Review

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