| Autor: |
Purbayanto MAK; Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, Warsaw 02-507, Poland.; Faculty of Mechatronics, Warsaw University of Technology, św. Andrzeja Boboli 8, Warsaw 02-525, Poland., Chandel M; Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, Warsaw 02-507, Poland.; Faculty of Mechatronics, Warsaw University of Technology, św. Andrzeja Boboli 8, Warsaw 02-525, Poland., Bury D; Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, Warsaw 02-507, Poland.; Faculty of Mechatronics, Warsaw University of Technology, św. Andrzeja Boboli 8, Warsaw 02-525, Poland., Wójcik A; Polish Academy of Sciences, Institute of Metallurgy and Materials Science, W. Reymonta 25, Cracow 30-059, Poland., Moszczyńska D; Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, Warsaw 02-507, Poland., Tabassum A; Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States., Mochalin VN; Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States.; Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States., Naguib M; Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States., Jastrzębska AM; Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, Warsaw 02-507, Poland.; Faculty of Mechatronics, Warsaw University of Technology, św. Andrzeja Boboli 8, Warsaw 02-525, Poland. |
| Abstrakt: |
TiO 2 /MXene heterostructure has garnered significant interest as a photocatalyst due to its large surface area and efficient charge carrier separation at the interface. However, current synthesis methods produce TiO 2 without clear crystal faceting and often require complicated postprocessing step, limiting its practical applications. We demonstrate a facile and controlled microwave-assisted hydrothermal synthesis for transforming multilayered Ti 3 CN MXene to a truncated-bipyramidal TiO 2 /Ti 3 CN heterostructure. The resulting TiO 2 nanocrystals at the Ti 3 CN surface exhibited crystalline anatase truncated bipyramids, exposing {001} and {101} facets. We further tailored an indirect optical band gap of the TiO 2 /Ti 3 CN heterostructure in the range of 3.17-3.23 eV by varying the hydrothermal synthesis time from 15 min to 5 h at a fixed temperature of 160 °C. Efficient charge separation allowed us to decompose 97% of methylene blue (MB) within 30 min of ultraviolet (UV) light irradiation, ∼3.9-fold faster than the benchmark P25, higher than any other TiO 2 /MXene heterostructures. With simulated white light, we achieved over 60% efficiency of the dye decomposition within 2 h of irradiation, which resulted in 1.5-fold faster kinetics than P25. We also observed a similar excellent performance of Ti 3 CN-derived TiO 2 in decomposing various persistent synthetic dyes, including commercial textile dye, methyl orange, and rhodamine B. In conclusion, our study provides a strategy for utilizing MXene chemical reactivity to produce highly crystalline optically active TiO 2 /Ti 3 CN heterostructure. The developed heterostructure can serve as an efficient photocatalyst for the degradation of organic pollutants. |
