Open AccessThe use of Al2O3 - pillared clay in cleaning of aqueous solutions from surfactants
Author(s) -
С. Ц. Ханхасаева
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/687/6/066068
Subject(s) - adsorption , montmorillonite , aqueous solution , chemistry , freundlich equation , sodium dodecyl sulfate , specific surface area , clay minerals , sulfate , sodium , inorganic chemistry , volume (thermodynamics) , chemical engineering , mineralogy , chromatography , organic chemistry , thermodynamics , catalysis , engineering , physics
The paper describes the Al 2 O 3 -pillared clays synthesized by modifying the natural montmorillonite clay with aluminum polyhydroxy complexes and subsequent heat treatment of the modified samples at temperatures of 400 ° C and 500 ° C . The textural characteristics of natural and Al 2 O 3 -pillared clays were determined by the method of low-temperature nitrogen adsorption. The results showed that the obtained materials had a specific surface area, which was 1.7 times larger than the surface of the original clay, and the total pore volume, which was 1.2 more, than the pore volume of the original clay. Anionic surfactants (sodium dodecyl sulfate C 12 H 25 OSO 3 Na and sulfonol C 12 H 25 C 6 H 4 SO 3 Na) adsorption results have shown that the clay modifying by polyhydroxocomplexes of aluminum leads to a significant increase in their aniono-exchange capacity. Al 2 O 3 -pillared clay exceeds the adsorption capacity of natural clay more than 2 times in the adsorption of sodium dodecylsulfate and sulfonol. It is established that the adsorption isotherms of sodium dodecylsulfate and sulfonol on Al 2 O 3 -pillared clays well obey the Freundlich adsorption isotherm equation, which describes multilayer adsorption on a heterogeneous surface of sorbents. Al 2 O 3 -pillared clays may be of interest for use in wastewater treatment from anionic surfactants.