Выполнена оценка сорбционной способности мультиметаллических MgCo/AlFe слоистых двойных гидроксидов (СДГ) по отношению к анионному красителю конго красному. Показано, что на эффективность сорбции практически не влияет присутствие незначительного количества посторонней фазы, предположительно обуславливающей магнитные свойства СДГ. Определены кинетические параметры сорбции. Установлено, что сорбция красителя на всех образцах протекает в смешаннодиффузионном режиме. Проанализированы изотермы адсорбции, показано, что в выбранном концентрационном интервале они удовлетворительно описываются моделью Ленгмюра.

Unstable oxidation state +3 of nickel can be stabilized in the structure of layered double hydroxides, the resulting crystallinity and properties being dependent on the synthesis method. Three different wet chemical methods (co-precipitation at variable pH, co-precipitation followed by hydrothermal treatment, co-precipitation with microwave treatment) were used to synthesize Mg/Ni–Al layered double hydroxides containing triply charged nickel cations. Lattice parameters of the samples synthesized by various methods were found to differ from each other by about 1.5%. The most crystallized sample was obtained by hydrothermal synthesis. The oxidation state of nickel in the LDH samples was confirmed by XPS. TEM mapping gave evidence of the uniform distribution of nickel in all the samples. The LDHs’ reduction with hydrogen and thermal transformations of the phase composition and morphology of LDHs were studied in detail. The properties of the samples synthesized by the different methods were shown to be quite similar.

This is a 'preproof' accepted article for Clay Minerals. This version may be subject to change during the production process.

No abstract

No abstract