Abstract
In this study, hierarchical titanium dioxide (TiO2) microspheres with controlled morphology derived from calcination treatment of hierarchical titanate microspheres were fabricated. The obtained hierarchical TiO2 microspheres with diameters of 1 to 2 µm were composed of polycrystalline anatase nanosheets with thickness of 10 nm. The morphology was manipulated by simply adjusting the molar ratio of tetrabutyl titanate/P123. At a low molar ratio of 17.04, TiO2 microspheres composed of a large number of nanosheets closely packed together were obtained. At a high molar ratio of 34.08, TiO2 hybrid architectures with polycrystalline anatase hierarchical microspheres and single-crystal anatase mesoporous (approximately 5 nm) nanospheres were obtained. Investigations on evolution formation revealed that P123 played a key role in the formation of a well-defined hierarchical structure. The photocatalytic performances of the obtained samples were investigated by the degradation of methylene blue and papermaking wastewater. When compared with commercial P25, the obtained hierarchical TiO2 microspheres exhibit superior photocatalytic activity, high degradation efficiency, and good reproducibility. The product with hybrid architectures exhibited the highest photocatalytic activity. The chemical oxygen demand and the chroma removal rate of papermaking wastewater achieved 85.5 and 100%, respectively, after 12 h of photodegradation.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51372124, 51572134) and the Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province.
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Li, S., Jiang, M., Shi, X. et al. P123 assisted morphology-engineered and hierarchical TiO2 microspheres for enhanced photocatalytic activity. J Porous Mater 24, 1425–1436 (2017). https://doi.org/10.1007/s10934-017-0383-4
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DOI: https://doi.org/10.1007/s10934-017-0383-4