Sorption properties of MgCo/AlFe layered double hydroxides
Abstract
The subjects of the research are MgCo/AlFe layered double hydroxides (LDHs) with hydrotalcite structure. The increase in the atomic fraction of cobalt and iron in the structure of metal hydroxide layers of the LDHs leads to generating ferrimagnetic properties. The main purpose of the research is the investigation of influence of the presence of a magnetic phase on the sorption properties of a material based on LDH. The
sorption properties of the samples of LDH obtained by coprecipitation method with different content of cobalt and iron cations are compared in the article.
Sorption capacity of the samples towards anionic dye Congo red was determined by static method. Dyes concentration in the solutions was determined spectrophotometrically. The experimental data on sorption of dye onto LDH has been processed using known models of chemical (pseudo-first and pseudo-second order, Elovich equation) and diffusion kinetics.
Sorption of dye onto samples of LDH was found to occur in mixed diffusion mode. Sorption of Congo red onto single-phase MgCo/AlFe – LDHs could be satisfactorily described by pseudo-second order equation. In the case of a sample containing magnetic phase, the sorption kinetics is better described by Elovich equation. It is widely used for chemical sorption cases and is suitable for describing systems with an
non-uniform adsorbing surface.
Sorption isotherms of Congo red were analyzed. It was shown that the sorption isotherms for all samples in the concentration range under study are described by Langmuir model. It was determined that the presence of a magnetic phase in the sorbent derived from LDH does not reduce the sorption capacity towards anionic dye.
The results obtained can be applied in the processes of water purification. The conclusion was made that the LDHs were prospective materials for preparation of sorbents with high sorption capacity towards anionic dyes capable of removal by magnetic separation.
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