Photocatalytic activity of TiO₂:AlPO₄-5 zeolites for the degradation of Indigo caramine dye

Abstract

Aluminophosphate zeolite (AlPO₄-5) coated or impregnated by clusters of TiO₂ were prepared under hydrothermal conditions (Temperature, ~150°C; Pressure is autogenous). These composite materials were subjected to a systematic characterization using X-ray diffraction, Fourier transform infrared spectroscopy, Scanning electron microscopy and BET surface area measurements. The encapsulation of TiO₂ in the AlPO₄ zeolite framework was confirmed by the profile analysis of X-ray diffraction patterns. The resultant products were employed successfully in the degradation of Indigo carmine dye. The effect of pH and the efficiency of composite materials on the degradation of Indigo carmine dye have been worked out. The decrease in the chemical oxygen demand proved the decomposition of harmful organics present in the dye solution.