Li–Y doped and codoped TiO2 thin films: Enhancement of photocatalytic activity under visible light irradiation

Visible-light responsible Mn-N-codoped TiO2 nanocrystal photocatalysts were synthesized for the first time by a simple hydrothermal synthesis method. X-ray powder diffraction (XRD) measurement indicated that all of the photocatalysts have an anatase crystallite structure and the increase of the doping concentration had less effect on the structure and particle size. Comparing to N-doped TiO2, a shift of the absorption edge of Mn-N-codoped TiO2 to a lower energy and a stronger absorption in the visible light region were observed. The Mn-N-codoped TiO2 showed a higher photocatalytic reactivity than undoped TiO2 and N-doped TiO2 for the photodegradation of rhodamine B (RhB) under visible light irradiation. The doping concentration had an optimal value, according to the highest photocatalytic activity. This suggested that Mn and N codoping has important effects on the improvement of visible-light responsible photocatalytic activity.

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Preparation and characterization of SiO2/BiOX (X = Cl, Br, I) films with high visible-light activity

RSC Advances ◽

10.1039/c4ra10227d ◽

2015 ◽

Vol 5 (7) ◽

pp. 4918-4925 ◽

Cited By ~ 17

Author(s):

Fan Shen ◽

Li Zhou ◽

Jiajia Shi ◽

Mingyang Xing ◽

Jinlong Zhang

Keyword(s):

Thin Films ◽

Photocatalytic Activity ◽

Visible Light ◽

Visible Light Irradiation ◽

Sol Gel ◽

Layered Structures ◽

Light Irradiation ◽

Gel Method ◽

Light Activity

SiO2/BiOX (X = Cl, Br, I) thin films with layered structures were prepared using a convenient sol–gel method. The films show a high and stable photocatalytic activity under visible-light irradiation.

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Immobilization of a Series of Homo/Heterobinuclear Metal (II) Phthalocyanine Hexasulphonates on Nanocrystalline TiO2 Thin Films and their Application in the Degradation of Methylene Blue

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1728 ◽

2011 ◽

Vol 356-360 ◽

pp. 1728-1732

Author(s):

Yan Zhen Yang ◽

Ren Jie Sun ◽

Yu Cheng Wu ◽

Li Tao ◽

Cheng Wu Shi

Keyword(s):

Thin Film ◽

Thin Films ◽

Methylene Blue ◽

Catalytic Activity ◽

Visible Light ◽

Visible Light Irradiation ◽

Light Irradiation ◽

Dark Condition ◽

Tio2 Thin Films ◽

Nanocrystalline Tio2

A series of binuclear metal (II) phthalocyanine hexasulphonates, (M-M)Pc, including (Co-Co)Pc, (Co-Zn)Pc, (Co-Mn)Pc, (Zn-Zn)Pc, (Zn-Mn)Pc and (Mn-Mn)Pc were synthesized and immobilized on nanocrystalline TiO2 thin films. The nanocrystalline TiO2 thin film was characterized by SEM, XRD and profilometer. The catalytic activity of various (M-M)Pc/nanocrystalline TiO2 thin films was evaluated by the degradation of methylene blue (MB) with air as the oxidant under visible light irradiation and dark condition. The results indicated that the prepared nanocrystalline TiO2 thin film had good crystalline and uniform particle size distribution. According to the degradation results of MB, various homo/hetero (M-M)Pc can sensitize nanocrystalline TiO2 thin films and improve their photocatalytic activity under visible light irradiation. The catalytic activity of hetero (M-M)Pc/nanocrystalline TiO2 thin films were more effective than that of homo (M-M)Pc under both visible light irradiation and dark condition, and the air purging was essential in degradation of MB. Therefore, these (M-M)Pc/nanocrystalline TiO2 thin films can be applied to the degradation of MB as a promising catalyzer.

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