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(A) Infrared spectra of TiO2, ZnO, and Ti–Zn with different molar ratios (Ti–Zn 1:3 (B), Ti–Zn 1:1 (C), and Ti–Zn 3:1 (D)) synthesized at different pH values (acid and basic). The figures inset in each diagram represent an amplification of the red box.
