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this behavior indicates that a band-band transition takes place instead of transitions from impurity levels.
The constitution of the heterostructure in CaSnO 3/Ag 6Si 2O 7 not only improved the separation of carriers but also promoted the absorption in the visible region owing to a reduction in the optical bandgap. For the solutions at pH 6, a very small adsorption occurred (8%), while the adsorption at pH 3 was much larger (16%). Therefore, when pH Mid-IR spectrum of CaSnO 3 sample calcined at 800 °C obtained in KBr (inset: far-IR spectrum of the same sample). which evaluated the photodegradation of an azo dye by TiO 2 and concluded that dye adsorption onto TiO 2 at low pH favors the photocatalytic reaction.The check digit is found by taking the last digit times 1, the preceding digit times 2, the preceding digit times 3 etc. The employed catalyst retained excellent recycling ability up to four cycles suggesting its excellent practicality in the field of catalysts.