Facile synthesis of Mn/N-doped TiO2 on wood-based activated carbon fiber as an efficient visible-light-driven photocatalyst
The exploration of highly efficient and stable visible-light-driven photocatalysts for wastewater treatment has been recognized as one of the most challenging topics in environmental remediation. In this study, we report a new type of Mn/N co-doped TiO2 supported on wood-based activated carbon fiber (Mn–N/TiO2-WACF) composite material that can be synthesized via sol–gel method. XRD indicates that the nano-TiO2 particles in the composites are in the anatase phase (except when calcined at 850 °C) and the average crystallite size is approximately 23–33 nm. Doping with Mn and N significantly inhibits the crystal phase transformation of TiO2 from anatase to rutile. Photocatalytic experiments confirm that the Mn–N/TiO2-WACF catalysts are highly efficient and robust for the photodegradation of methylene blue under visible light irradiation (λ > 420 nm). Mn–N/TiO2-WACF exhibits the highest photocatalytic activity (reaches 99%) after calcined at 550 °C. The introduction of Mn and N not only improves the light adsorption and redox activity of TiO2, but also promotes photochemical stability because of narrow band gap energy and lower recombination rate of photoinduced electron–hole pairs. Composite photocatalysts such as these materials are important in the ongoing effort to design and explore new low cost, high efficiency, robust photocatalytic materials.
The research was financially supported by National Natural Science Foundation of PR China (No. 31270607); Tianjin City Education Commission Research Fund Planning Project (Natural Science) (No. 2017KJ032); and Opening Project Fund of Key Laboratory of Rubber Biology and Genetic Resource Utilization, Ministry of Agriculture/State Key Laboratory Breeding Base of Cultivation & Physiology for Tropical Crops/Danzhou Investigation & Experiment Station of Tropical Crops, Ministry of Agriculture (RRI-KLOF201801).
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Conflict of interest
The authors declare that there is no conflict of interests regarding the publication of this article.
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