Investigations On Structure And Properties Of Surfactant Modified Layered Double Hydroxides, And Its Interaction With Pesticides

In this thesis, alkyl sulfonate, alkyl sulfate and aromatic sulfonate surfacettant anions were intercalated into layered double hydroxides (LDHs), the structures and physicochemical properties of these intercalated materials have been investigated profoundly; A new concept "hydrophobization" has been proposed; Interactions between pesticids and these materials were also investigated.Dodecyl sulfonate, dodecyl sulfate and dodecyl benzenesulfonate anions were intercalated into LDHs via anion exchange and co-precipitation methods. The structures of as-synthesized materials were characterized by XRD, FT-IR methods. According to the characterization results, the interlamellar arrangement of surfacetant molecules was proposed. The measurement of physicochemical properties revealed that these hydrophobilized materials have unique properties. Thermal decomposition process of these surfacetant intercalated LDHs were also studied by TG/DTA analysis, together with XRD, FT-IR analyses for samples treated at different temperature, Based on the experimental results, mechanisms were proposed for thermal decomposition of these materials.Using self-assembly methods, chlorpyrifos incorporated LDHs were obtained by incorporating the pesticide into the interlayer hydrophobic phase of surfactant-modified LDHs. The experiment results revealed that the amount and mode of incorporation for pesticide strongly depend on the HOCs structure and surfactant properties, as well as the packing mode and...