III International Conference

PP-III-41Fe- AND Fe/Al-PILLARED CLAYS IN THE CATALYTIC WET PEROXIDEOXIDATION OF AZODYESKhankhasaeva S.T., Badmaeva S.V., Dashinamzhilova E.Ts., Tsyrentarova S.V.,Oshorova T.G.Baikal Institute of Nature Management, Ulan-Ude, RussiaE-mail: shan@binm.bsc.buryatia.ruСatalytic wet peroxide oxidation of azodyes was carried out using Fe- and Fe/Al-pillaredclays as catalysts. Pillared clays were prepared from naturally occurring monmorillonites byintercalating with polyoxocations containing iron, iron and aluminium with Fe/Al = 1:1, 1:10.The PILC materials were characterized by IR spectroscopy, XRD, BET surface areameasurements. Fe/Al (1:10)-PILCs allows almost total colour removal of the dyes and 90%removal of COD without the significant leaching of Fe ions. Fe-, Fe/Al (1:1)-PILCs have highactivity, but they are less stable.Layer-pillar structured materials synthesized by intercalating metallic polyoxocomplexesbetween silicate layers of swelling clays, such as montmorillonites attract the interest asheterogeneous catalysts. Fe-containing pillared clays (PILCs) might be promising catalystsfor the successful wet oxidation of organic pollutants. Dyehouse effluents from the textileindustry impose serious environmental problems because of their colour and their highchemical oxygen demand (COD).In this study catalytic wet peroxide oxidation of azodyes (Straight Clean-Blue, AcidChrome Blue-Black) was carried out using Fe- and Fe/Al-pillared clays as catalysts, and thecatalytic performance of the clays was investigated.Pillared clays (PILC) were prepared from naturally occurring montmorillonites byexchanging interlayer cations (Mg 2+ , Na + , K + ) with polyoxocations containing a) iron(Fe-PILC), b) iron and aluminium within the complex with Fe/Al = 1:1, 1:10 (Fe/Al-PILCs).The obtained PILC materials were calcined at 500 o C and characterized by chemical analysis,IR spectroscopy, XRD, BET surface area measurements.TableCharacteristics of PILCsContent, wt.% S BET ,CatalystDAl 2 О 3 Fe 2 О 3 m 2 pore, Å V pore , сm 3 /g d 001 , Å/gFe-PILCs 11.8 6.6 136 76.4 0.271 12.4Fe/Al (1:1)-PILCs 12.5 4.8 118 63.0 0.212 14.0Fe/Al (1:10)-PILCs 16.7 2.1 219 78.0 0.268 18.3S BET – surface area, V pore – pore volume, D pore – average pore diameter, d 001 – interlayer distance.546