TY - JOUR
T1 - Flocculation of montmorillonite dispersions based on surfactant-polymer interactions
AU - Magdassi, S.
AU - Rodel, Ben Zion
PY - 1996/12/2
Y1 - 1996/12/2
N2 - A two-step flocculation process is described in which a polycation (polydiallyldimethylammonium chloride) is adsorbed on to negatively charged montmorillonite particles, followed by the addition of an anionic surfactant [sodium dodecyl sulfate (SDS)]. At a 1:1 molar ratio, optimal flocculation is obtained owing to the formation of an insoluble surfactant-polymer complex in the presence of the particles. The precipitation of the insoluble complex is also dependent on the SDS and polymer concentrations, and occurs at a 1:1 SDS:monomer molar ratio. From adsorption isotherms of the polymer-particle and surfactant-polymer systems, the adsorption energy was calculated and subsequently a flocculation mechanism is suggested.
AB - A two-step flocculation process is described in which a polycation (polydiallyldimethylammonium chloride) is adsorbed on to negatively charged montmorillonite particles, followed by the addition of an anionic surfactant [sodium dodecyl sulfate (SDS)]. At a 1:1 molar ratio, optimal flocculation is obtained owing to the formation of an insoluble surfactant-polymer complex in the presence of the particles. The precipitation of the insoluble complex is also dependent on the SDS and polymer concentrations, and occurs at a 1:1 SDS:monomer molar ratio. From adsorption isotherms of the polymer-particle and surfactant-polymer systems, the adsorption energy was calculated and subsequently a flocculation mechanism is suggested.
KW - adsorption
KW - flocculation
KW - interaction
KW - montmorillonite
KW - polydiallylmethyla mmonium chloride
KW - sodium dodecylsulphate
UR - http://www.scopus.com/inward/record.url?scp=0030566880&partnerID=8YFLogxK
U2 - 10.1016/S0927-7757(96)03725-9
DO - 10.1016/S0927-7757(96)03725-9
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AN - SCOPUS:0030566880
SN - 0927-7757
VL - 119
SP - 51
EP - 56
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
IS - 1
ER -