Enhancement of NOx photo-oxidation by Fe- and Cu-doped blue TiO2

Springer Science and Business Media LLC - Tập 27 - Trang 26702-26713 - 2020
Adriana Martinez-Oviedo1, Schindra Kumar Ray1, Bhupendra Joshi2, Soo Wohn Lee1
1Department of Environmental and Bio-Chemical Engineering, Sun Moon University, Asan, Republic of Korea
2Department of Fusion Science and Technology, Sun Moon University, Asan, Republic of Korea

Tóm tắt

The present work is focused on the removal of NOx with reduced blue TiO2 with Fe (blue Fe-TiO2)- and Cu (blue Cu-TiO2)-doped photocatalyst. TiO2 was reduced via lithium in EDA (blue TiO2). Fe and Cu ions were doped in the reduced TiO2 (blue Fe-TiO2 and blue Cu-TiO2). The material resulted in a core-shell structure of amorphous and anatase phase. XPS suggests the existence of Ti3+ species and oxygen vacancies within the structure of TiO2. Additionally, valence bond (VB)-XPS shows the generation of intermediate levels at the band edge of the doped photocatalyst. Photocurrent, electrochemical impedance spectroscopy and cyclic voltammetry confirmed the enhanced charge-separation process in doped reduced TiO2. The photocatalysts were tested for the photo-oxidation of NOx. Blue Fe-TiO2 reveals the efficiency of 70% for NO elimination and 44.74% for NO2 formation. The improved efficiency of the doped photocatalyst is related to the re-engineered structure with Ti3+ species, oxygen vacancies, and charge traps. Electron spin resonance (ESR) measurement was carried out for blue Fe-TiO2 to confirm the formation of reactive oxygen species (ROS). Furthermore, ion chromatography was used to investigate the mechanism of NOx oxidation. In conclusion, the doped blue TiO2 has a strong tendency to photo-oxidize NOx gasses.

Tài liệu tham khảo

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