Bio-Inspired Hierarchical Porous TiO₂ for Photodegradation of Organic Pollutant under Solar Irradiation

Abstract:

Photo-degradation of organic pollutants is of immense importance for environmental protection. The key is low-cost photocatalysts of high efficiency. Templating approach is attractive to gain hierarchical porous photocatalysts with high surface area, while is usually stuck by the limited types of desirable templates, in particular those with sophisticated microstructures. Herein, we showed a bio-inspired templating strategy that was applied to fabricate an efficient TiO₂ photocatalyst with a unique hierarchical porous structure. Taking rape-pollen grains as a typical example of bio-templates, a process combining hydrothermal treatment with calcination was developed to grow TiO₂ nanoparticles of 6-14 nm on the templates and subsequently to remove the organic biotemplates. As-obtained TiO₂ were micro-sized spheres or ellipsoids that were surrounded by open tubular arrays. The surface area was as large as ~175 m²/g. For photodegradation, the rape-pollen-grains-architectured TiO₂ has a rate (k) of 0.150 min^-1, which is 10.9 times faster than the non-templated TiO₂. The superior photocatalytic activity should be ascribed to the unique hierarchical porous structures, which provided interconnected channels for efficient mass transport and a large surface area for fast reaction. Our work demonstrates an effective method, namely bioinspired templating, for the scalable synthesis of efficient photocatalysts. Considering the structural diversity of pollen grains, this work may inspire others on the research of photo-response materials that rely on morphology optimization.

• Periodical: Key Engineering Materials (Volume 922)
• Pages: 215-221
• DOI: https://doi.org/10.4028/p-23hf7e
• Online since: June 2022
• Authors: Ling Ling Wu, Hao Yue Zhang, Cui Ping Guo, Fang Song*
• Keywords: Hierarchical Porous, Photodegradation, Solar Irradiation, TiO₂

References

[1] Weng, B.; Qi, M.-Y.; Han, C.; Tang, Z.-R.; Xu, Y.-J., ACS Catalysis 2019, 9 (5), 4642-4687.

[2] Setvin, M.; Shi, X.; Hulva, J.; Simschitz, T.; Parkinson, G. S.; Schmid, M.; Di Valentin, C.; Selloni, A.; Diebold, U., ACS Catalysis 2017, 7 (10), 7081-7091.

DOI: 10.1021/acscatal.7b02003

[3] Kang, X.; Liu, S.; Dai, Z.; He, Y.; Song, X.; Tan, Z., Catalysts 2019, 9 (2).

[4] Wang, S.; Liu, G.; Wang, L., Chem Rev 2019, 119 (8), 5192-5247.

[5] Han, Q.; Wu, C.; Jiao, H.; Xu, R.; Wang, Y.; Xie, J.; Guo, Q.; Tang, J., Advanced Materials 2021, 2008180.

[6] Gupta, V. K.; Lorke, M.; Frauenheim, T.; Deák, P., The Journal of Physical Chemistry C (2021).

[7] Wang, X.; Sun, M.; Murugananthan, M.; Zhang, Y.; Zhang, L., Applied Catalysis B-Environmental 2020, 260.

[8] Zhang, X.; Chen, J.; Jiang, S.; Zhang, X.; Bi, F.; Yang, Y.; Wang, Y.; Wang, Z., Journal of Colloid and Interface Science 2021, 588, 122-137.

[9] Liang, M.; Li, X.; Jiang, L.; Ran, P.; Wang, H.; Chen, X.; Xu, C.; Tian, M.; Wang, S.; Zhang, J., Applied Catalysis B: Environmental 2020, 277, 119231.

[10] He, F.; Meng, A.; Cheng, B.; Ho, W.; Yu, J., Chinese Journal of Catalysis 2020, 41 (1), 9-20.

[11] Xiu, Z.; Guo, M.; Zhao, T.; Pan, K.; Xing, Z.; Li, Z.; Zhou, W., Chemical Engineering Journal 2020, 382.

[12] Lan, K.; Wang, R.; Wei, Q.; Wang, Y.; Hong, A.; Feng, P.; Zhao, D., Angewandte Chemie 2020, 132 (40), 17829-17836.

DOI: 10.1002/ange.202007859

[13] Yang, C.; Chen, S.; Su, H.; Zhang, H.; Tang, J.; Guo, C.; Song, F.; Zhang, W.; Gu, J.; Liu, Q., Frontiers of Materials Science 2019, 13 (2), 126-132.

[14] Chen, S.; Yang, C.; Wu, L.; Su, H.; Zhu, Y.; Li, G.; Song, F.; Zhang, W.; Gu, J.; Liu, Q., Journal of the American Ceramic Society (2019).

[15] Guan, Y.; Su, H.; Yang, C.; Wu, L.; Chen, S.; Gu, J.; Zhang, W.; Zhang, D., Sci Rep 2018, 8 (1), 9261.

[16] Yoon, J.-L.; Weiss, P. S.; Cho, N.-J., ACS Nano 2018, 12 (6), 5073-5077.

[17] Wu, L.; He, J.; Shang, W.; Deng, T.; Gu, J.; Su, H.; Liu, Q.; Zhang, W.; Zhang, D., Advanced Optical Materials 2016, 4 (2), 195-224.

DOI: 10.1002/adom.201500428

[18] Song, F.; Su, H.; Chen, J.; Moon, W.-J.; Lau, W. M.; Zhang, D., Journal of Materials Chemistry 2012, 22 (3), 1121-1126.

[19] Zhou, H.; Li, P.; Liu, J.; Chen, Z.; Liu, L.; Dontsova, D.; Yan, R.; Fan, T.; Zhang, D.; Ye, J., Nano Energy 2016, 25, 128-135.

[20] Lee, K.; Yoon, H.; Ahn, C.; Park, J.; Jeon, S., Nanoscale 2019, 11 (15), 7025-7040.

[21] Low, J.; Dai, B.; Tong, T.; Jiang, C.; Yu, J., Adv Mater 2019, 31 (6), e1802981.

[22] Liu, S.; Gordiichuk, P.; Wu, Z. S.; Liu, Z.; Wei, W.; Wagner, M.; Mohamed-Noriega, N.; Wu, D.; Mai, Y.; Herrmann, A.; Mullen, K.; Feng, X., Nat Commun 2015, 6, 8817.

DOI: 10.1038/ncomms9817

[23] Li, B.; Xi, B.; Wu, F.; Mao, H.; Liu, J.; Feng, J.; Xiong, S., Advanced Energy Materials 2019, 9 (8).

[24] Kohtani, S.; Kawashima, A.; Miyabe, H.,. Catalysts 2017, 7 (10), 303.