Figure 5 presents nitrogen adsorption–desorption isotherms, revealing a decreasing trend in specific surface area for PT with successive calcination at 470 °C, 570 °C, and 670 °C, resulting in values of 54.5 m 2 /g, 12.5 m 2 /g, and 1.3 m 2 /g, the specific surface area of samples is shown in Table 2 .
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A Fresh Perspective on the Impact of ZnTiO<sub>3</sub> Coupling on the Microstructure and Photocatalytic Properties of TiO<sub>2</sub> Fabricated at Varied Temperatures.
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Within the PT samples, a clear trend emerges: the absorption threshold of PT-670 exceeds that of PT-470 and PT-570.