Flocculation of bentonite particles by a cyanobacterial bioflocculant

N. Levy; Y. Bar-Or; S. Magdassi

doi:10.1016/0166-6622(90)80239-Z

Flocculation of bentonite particles by a cyanobacterial bioflocculant

N. Levy^*, Y. Bar-Or, S. Magdassi

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Flocculation of bentonite suspensions by bioflocculant produced by the cyanobacterium Phormidium species strain J1 was correlated with the adsorption mechanism of the flocculant on the bentonite particles in the presence of various CaCl₂ concentrations. The optimal flocculant concentration decreased with an increase in CaCl₂ concentration, and the adsorption increased with the increase in CaCl₂ concentration. Langmuir-type adsorption isotherms were obtained yielding ΔG°_ads of - 12 kcal mol^-1, at any CaCl₂ concentration, while the maximum adsorption increased with the increase in CaCl₂ concentration. From measurements of electrophoretic mobility and Ca²⁺ uptake by the particles and the flocculant if was concluded that the role of CaCl₂ is to increase the amount of adsorbed flocculant at any given flocculant concentration, thus shifting the optimal flocculant concentration toward lower values.

Original language	American English
Pages (from-to)	337-349
Number of pages	13
Journal	Colloids and Surfaces
Volume	48
Issue number	C
DOIs	https://doi.org/10.1016/0166-6622(90)80239-Z
State	Published - 1990

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title = "Flocculation of bentonite particles by a cyanobacterial bioflocculant",

abstract = "Flocculation of bentonite suspensions by bioflocculant produced by the cyanobacterium Phormidium species strain J1 was correlated with the adsorption mechanism of the flocculant on the bentonite particles in the presence of various CaCl2 concentrations. The optimal flocculant concentration decreased with an increase in CaCl2 concentration, and the adsorption increased with the increase in CaCl2 concentration. Langmuir-type adsorption isotherms were obtained yielding ΔG°ads of - 12 kcal mol-1, at any CaCl2 concentration, while the maximum adsorption increased with the increase in CaCl2 concentration. From measurements of electrophoretic mobility and Ca2+ uptake by the particles and the flocculant if was concluded that the role of CaCl2 is to increase the amount of adsorbed flocculant at any given flocculant concentration, thus shifting the optimal flocculant concentration toward lower values.",

author = "N. Levy and Y. Bar-Or and S. Magdassi",

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doi = "10.1016/0166-6622(90)80239-Z",

language = "American English",

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pages = "337--349",

journal = "Colloids and Surfaces",

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T1 - Flocculation of bentonite particles by a cyanobacterial bioflocculant

AU - Levy, N.

AU - Bar-Or, Y.

AU - Magdassi, S.

PY - 1990

Y1 - 1990

N2 - Flocculation of bentonite suspensions by bioflocculant produced by the cyanobacterium Phormidium species strain J1 was correlated with the adsorption mechanism of the flocculant on the bentonite particles in the presence of various CaCl2 concentrations. The optimal flocculant concentration decreased with an increase in CaCl2 concentration, and the adsorption increased with the increase in CaCl2 concentration. Langmuir-type adsorption isotherms were obtained yielding ΔG°ads of - 12 kcal mol-1, at any CaCl2 concentration, while the maximum adsorption increased with the increase in CaCl2 concentration. From measurements of electrophoretic mobility and Ca2+ uptake by the particles and the flocculant if was concluded that the role of CaCl2 is to increase the amount of adsorbed flocculant at any given flocculant concentration, thus shifting the optimal flocculant concentration toward lower values.

AB - Flocculation of bentonite suspensions by bioflocculant produced by the cyanobacterium Phormidium species strain J1 was correlated with the adsorption mechanism of the flocculant on the bentonite particles in the presence of various CaCl2 concentrations. The optimal flocculant concentration decreased with an increase in CaCl2 concentration, and the adsorption increased with the increase in CaCl2 concentration. Langmuir-type adsorption isotherms were obtained yielding ΔG°ads of - 12 kcal mol-1, at any CaCl2 concentration, while the maximum adsorption increased with the increase in CaCl2 concentration. From measurements of electrophoretic mobility and Ca2+ uptake by the particles and the flocculant if was concluded that the role of CaCl2 is to increase the amount of adsorbed flocculant at any given flocculant concentration, thus shifting the optimal flocculant concentration toward lower values.

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U2 - 10.1016/0166-6622(90)80239-Z

DO - 10.1016/0166-6622(90)80239-Z

M3 - Article

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VL - 48

SP - 337

EP - 349

JO - Colloids and Surfaces

JF - Colloids and Surfaces

IS - C

ER -

Flocculation of bentonite particles by a cyanobacterial bioflocculant

Abstract

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