| Summary: | 碩士 === 國立屏東技術學院 === 環境工程技術研究所 === 84 === This study use thirteen kinds of different surfactants and
four kinds of different nature soil to investigate the
mechanisms affecting surfactant''s Critical Micelle
Concentration(CMC) value and surfactants adsorption onto soil.
The primary goal of this study is to understand the effect of
ionic strength and pH value on surfactant''s CMC value and
adsorption behavior of different surfactants onto different
nature soil. The results of this study indicate that the
hydrophilic and hydrophobic portion of nonionic surfactants
influence it''s CMC value and micelle polarity. The concentration
of electrolyte influence the CMC value for ionic surfactants.
However, the CMC value for nonionic surfactants is independent
of the concentration of electrolyte.The effect of pH value on
the CMC value for all surfactants used in this study is
insignificant. For nonionic surfactants, the major adsorption
mechanisms onto soil are H-bonding and Van Der Waals forces. For
ionic surfactants, it is the electrostatic interactions and Van
Der Waals forces responsible for adsorption onto soil. Finally,
the results of adsorption experiment identified four important
factor dictating the adsorption of surfactants onto soil. These
are the hydrophilic and hydrophobic portion of surfactants,
surface charge of soil, Si/Al ratio of soil surface and the
organic matter content of soil.
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