期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 1, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2020.104828
关键词
Photocatalysis; Diuron degradation: NOx conversion; Bronsted acid sites; alpha Fe2O3 TiO2 doped with P
资金
- Universidad Autonoma de Nuevo Leon (PAICyT UANL 2020)
- Comunitat Autonoma de les Illes Balears through the Direccio General de Politica Universitaria i Recerca [PRD2018/45]
- CONACYT
- Centro de Estudios de Posgrado (UIB)
The photocatalytic activity of mixed oxide alpha-Fe2O3/TiO2 doped with P was evaluated for diuron degradation and NOx oxidation. The Ti/P showed the highest activity for diuron degradation, while alpha Fe-Ti demonstrated the best performance for NOx oxidation under both UV and visible light.
The photocatalytic activity of mixed oxide alpha-Fe2O3/TiO2 doped with P (alpha Fe-Ti/P) was evaluated on diuron degradation in aqueous solution and NOx oxidation under UV and visible light irradiation. The microwave assisted sol-gel route was used to prepare the alpha Fe-Ti/P catalyst. The TiO2 doped with P (Ti/P), alpha-Fe2O3/TiO2 (alpha Fe-Ti) and TiO2 (Ti) were also synthesized under similar conditions as reference catalysts. The samples were characterized by different instrumental techniques (XRD, UV-VIS with DRS, PL, N-2 adsorption, pHPZC, XPS, HRTEM, and FTIR). The photocatalytic activity on diuron degradation in aqueous media under UV and visible light followed the tendency Ti/P > alpha Fe-Ti/P > alpha Fe-Ti > Ti. The characteristics of the catalysts that enhanced photocatalytic reaction in liquid media were the low value of point of zero charge associated with Bronsted surface acid sites, narrow band-gap, small crystallite size, reduced e(-)/h(+) recombination rate, and large surface area attributed to the P incorporation on the TiO2. On the other hand, the NOx oxidation on the gas-phase reaction under UV and visible light followed the trend alpha Fe-Ti > Ti > Ti/P > alpha Fe-Ti/P. These results could be related to the assemble of alpha Fe2O3 nanoparticles with TiO2 to form alpha Fe2O3/TiO2 heterostructure that extended the optical absorption in the visible range and increased the basicity of the prepared TiO2 based material (Lewis basic surface sites).
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