Organization of amphiphiles, Part VIII: Role of polyoxyethylated alkylphenols in optimizing the beneficiation of hydrophilic mineral |
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| Authors: | Pramila Kumari Misra Sagarika Panigrahi P Somasundaran |
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| Institution: | aCentre of Studies in Surface Science and Technology, Department of Chemistry, Sambalpur University, Jyoti Vihar-768019, Orissa India;bLangmuir Centre for Colloids and Interface, Henry Krumb School of Mines, Columbia University, New York-10027, USA |
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| Abstract: | The floatability of silica has been determined by adsorbing various concentrations of a series of polyoxyethylated nonyl and octyl alkyl phenols of varying oxyethylene units (10–40 units) to investigate the role of adsorbed layer. It is seen that the floatability of silica increases with increase in concentration till a maximum of  90% in premicellar region and then decrease to minimum of 40–45% in all cases in spite of the significant differences in adsorption densities. Zeta potential measurement reveals that a thin oxyethylene layer is formed at silica–water interface masking silica surface (Pramila K. Misra, P. Somasundaran, J. Surf. Deterg., Vol. 7, 2004, 373). This layer with oxyethylene units lying on silica surface and alkyl chain dangling to the bulk solution provides the same extent of hydrophobicity. The decrease in flotation recovery has been attributed to increase in the solvent hydrophobicity due to formation of premicellar aggregates and micelles. |
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| Keywords: | flotation polyoxyethylated alkyl phenol isoadsorptive point zeta potential adsorption of nonionic surfactant |
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