Optimization of the TiO2 content and location in core–shell tubular carbon nanofibers to improve the photocatalytic activity under visible light irradiation

IF 5.5 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Carbon Letters Pub Date : 2024-09-15 DOI:10.1007/s42823-024-00813-2
Bo-Hye Kim
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Abstract

This study examines the effects of the TiO2 content and TiO2 position in the core or shell within tubular carbon nanofibers on the photocatalytic activity under visible light. Core–shell tubular carbon nanofiber composites whose cores are filled with TiO2 nanoparticles (PMTi(10)P) are fabricated through coaxial electrospinning and subsequent heat treatment. The PMTi(10)P composites with well-preserved TiO2 nanoparticles in the core part induce more oxygen vacancies, Ti3+ species, chemisorbed oxygen species, and anatase phases, significantly improving the photocatalytic performance. They act as photoelectron traps, allowing more photoelectrons and holes to participate in the photocatalytic reaction and extending the absorbance of TiO2 to the visible light region. The resulting PMTi(10)P photocatalyst exhibits excellent performance of 100% removal of methylene blue within 30 min and maintains nearly 100% removal of 15 ppm methylene blue over 10 regeneration cycles, indicating consistent and stable photocatalytic performance.

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优化核壳管状碳纳米纤维中 TiO2 的含量和位置以提高可见光照射下的光催化活性
本研究探讨了管状碳纳米纤维中的 TiO2 含量和 TiO2 在芯或壳中的位置对可见光下光催化活性的影响。通过同轴电纺丝和随后的热处理,制造出了芯壳管状碳纳米纤维复合材料(PMTi(10)P),其核心填充了TiO2纳米粒子。芯部具有保存完好的 TiO2 纳米颗粒的 PMTi(10)P 复合材料诱导出更多的氧空位、Ti3+ 物种、化学吸附氧物种和锐钛矿相,显著提高了光催化性能。它们作为光电子陷阱,允许更多的光电子和空穴参与光催化反应,并将 TiO2 的吸收率扩展到可见光区域。所制备的 PMTi(10)P 光催化剂性能优异,可在 30 分钟内 100% 清除亚甲基蓝,并可在 10 个再生周期内保持对 15 ppm 亚甲基蓝的近 100% 清除率,表明光催化性能持续稳定。
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来源期刊
Carbon Letters
Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
7.30
自引率
20.00%
发文量
118
期刊介绍: Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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