Abstract
Ba0.77Sr0.23TiO3 (BST)/kaolinite 5%, 10%, and 20% w/w nanocomposites were synthesized by the modified wet chemistry sol-gel method. FTIR (Fourier transform infrared) spectrum represented the formation of barium strontium titanate at 950–970 cm−1 which was corresponding to the Ti-O-Si bridge. Two distinct bands at 600 and 760 cm−1 confirmed the appearance of kaolinite in nanocomposite structures. The crystallite structure and lattice parameters of samples was studied by X-ray diffraction. Adding kaolinite to BST nanoparticles resulted in increasing the intensity of metakaolinite peaks. FESEM (field emission scanning electron microscope) pictures illustrated the cracks on the layer of kaolinite as well as the tetragonal shape of BST nanoparticles. Photocatalytic studies confirmed that by kaolinite insertion, the decolorization efficiency decreased dramatically. Barium strontium titanate by generating electron-hole mechanisms could decompose methylene blue (MB) dye, conveniently, and the sample with the formula of Ba0.77Sr0.23TiO3/kaolinite 5%w/w represented the highest photodegradation properties. The kinetics and mechanism of photodegradation were studied for all samples.
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