The structural modification of Ba0.5Sr0.5TiO3 (BST) nanocatalyst was successfully synthesized via sol-gel process. The BST\ncatalyst was modified by A-site (A-BST), A-B-site (A-B-BST), and B-site (B-BST) in order to investigate the effect of structurally\nmodified BST catalyst for photocatalytic decolorization of methylene blue. The structurally modified BST catalysts can increase\nthe non radiation energy such as phonon energy compared to that of BST one. The partial incorporation of the A-BST catalyst\nwas evidenced by the higher-ordered structure by increasing number of Ti4+ ions and the lattice oxygen. The A-B-BST and ABST\ncatalysts were given more electron-transfer in the TiO6 than that of BST and B-BST catalysts, respectively. The A-B-BST\ncatalyst promoted the oxidation of the lattice oxygen by holes capturing to form the chemisorbed oxygen, presenting the highest\nphotobleaching activity of methylene blue. On the other hand, more oxygen vacancies recombination of BST catalyst compared to\nthat of structurally modified BST catalysts presented the reduction of photocatalytic activity.
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