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Sorption of Anionic Surfactants on Layered Double Hydroxides
1Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Av. dos Bandeirantes, 3900, CEP, Ribeirão Preto, SP, 14040-901, Brazil
Journal of Colloid and Interface Science
|September 14, 2000
Summary
Layered double hydroxides (LDHs) efficiently remove surfactants from water. Adsorption mechanisms depend on LDH type, with calcined LDHs offering both adsorption and intercalation for enhanced removal.
Area of Science:
- Environmental Chemistry
- Materials Science
- Surface Chemistry
Background:
- Surfactant pollution poses environmental challenges.
- Layered double hydroxides (LDHs) are promising materials for pollutant removal.
- Understanding surfactant-LDH interactions is crucial for water treatment applications.
Purpose of the Study:
- To investigate the adsorption of various anionic surfactants onto layered double hydroxides (LDHs).
- To compare surfactant adsorption behavior on LDHs with that on mineral oxides.
- To elucidate the mechanisms of surfactant removal by LDHs, including adsorption and intercalation.
Main Methods:
- Adsorption experiments under controlled conditions.
- Measurement of electrokinetic potential of surfactant-adsorbed LDH particles.
- Sorption studies using sodium dodecyl sulfate (SDS) and calcined LDH.
Main Results:
- Surfactant adsorption on LDHs can be modeled similarly to adsorption on mineral oxides.
- Electrokinetic potential measurements revealed layer rearrangement above the critical micelle concentration (CMC).
- Calcined LDHs demonstrated regeneration via intercalation of surfactant anions, enhancing removal efficiency.
Conclusions:
- LDHs are highly effective for removing surfactants from aqueous solutions.
- Two distinct removal processes, adsorption and adsorption-intercalation, occur depending on the LDH starting material.
- Further understanding of these mechanisms supports the application of LDHs in wastewater treatment.