CONICET | Buscador de Institutos y Recursos Humanos

In this study, a new procedure for the synthesis of pillared clays is proposed. Ageing process and intercalation reaction were carried out by using microwave irradiation in order to decrease the consumption of three important industrial parameters; time, water and energy. The effects of microwave irradiation, the amount of aluminium and Al3+/clay ratio on the physicochemical properties of Al-pillared montmorillonites were investigated. The structural changes depending on the intercalation and microwave irradiation were determined by conducting the XRD, FTIR and SEM analyses and by measuring specific surface area, pore size distribution. Additionally, STA analyses and zeta potential measurements were carried out to determine the physicochemical properties. According to the XRD measurements, d0013+/clay ratio on the physicochemical properties of Al-pillared montmorillonites were investigated. The structural changes depending on the intercalation and microwave irradiation were determined by conducting the XRD, FTIR and SEM analyses and by measuring specific surface area, pore size distribution. Additionally, STA analyses and zeta potential measurements were carried out to determine the physicochemical properties. According to the XRD measurements, d001001 value of microwave irradiated samples is not affected by the amount of aluminium and Al3+/clay ratio and microwave irradiation causes a 0.20 nm contraction in d001 value comparison to that of conventionally pillared sample. Additionally all d001 peaks have symmetry indicating a satisfactorily ageing of the pillaring solution and intercalation of Keggin ions. The results of FTIR analyses reveal that the intensity of peaks assigned to Keggin-OH and Keggin-H2O stretches is diminished in the case of microwave irradiated 3 samples. STA analyses indicated that amount of water released during dehydroxylation is decreased in the case of microwave irradiated samples. By considering the contraction in d0013+/clay ratio and microwave irradiation causes a 0.20 nm contraction in d001 value comparison to that of conventionally pillared sample. Additionally all d001 peaks have symmetry indicating a satisfactorily ageing of the pillaring solution and intercalation of Keggin ions. The results of FTIR analyses reveal that the intensity of peaks assigned to Keggin-OH and Keggin-H2O stretches is diminished in the case of microwave irradiated 3 samples. STA analyses indicated that amount of water released during dehydroxylation is decreased in the case of microwave irradiated samples. By considering the contraction in d001001 peaks have symmetry indicating a satisfactorily ageing of the pillaring solution and intercalation of Keggin ions. The results of FTIR analyses reveal that the intensity of peaks assigned to Keggin-OH and Keggin-H2O stretches is diminished in the case of microwave irradiated 3 samples. STA analyses indicated that amount of water released during dehydroxylation is decreased in the case of microwave irradiated samples. By considering the contraction in d0012O stretches is diminished in the case of microwave irradiated 3 samples. STA analyses indicated that amount of water released during dehydroxylation is decreased in the case of microwave irradiated samples. By considering the contraction in d001001 values and the decreases in Keggin-stretching bands and also in the amount of dehydroxylation water, it was concluded that microwave irradiation has calcination effect on the intercalated Keggin ions.