Enhanced photocatalytic activity for degrading Rhodamine B solution of commercial Degussa P25 TiO2 and its mechanisms

Xu, Qin; Jing, Liqiang; Tian, Guohui; Qu, Yanbin; Feng, Yujie

doi:10.1016/j.jhazmat.2009.07.120

Cited by 136 publications

(58 citation statements)

References 27 publications

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“…N-TiO2, along with pure TiO2. Pure TiO2 photocatalysts presented the absorption edge at λ ≈ 400 nm, which were consistent with the results obtained other studies [16][17][18]. However, for both Sand N-TiO2 photocatalysts, the light absorption region was redshifted.…”

Section: Surface Characteristics Of Photocatalystssupporting

confidence: 92%

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

2012

Clean Technology

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주제어 : 질소 도핑, 황 도핑, 공기 유량, 아세톤 생성, 발광 다이오드Abstract : This work explored the characteristics and the photocatalytic activities of S element-doped TiO2 (S-TiO2) and N element-doped TiO2 (N-TiO2) for the decomposition of gas-phase isopropyl alcohol (IPA) at sub-ppm concentrations, using a plug-flow reactor irradiated by 8-W daylight lamp or visible light-emitting-diodes (LEDs). In addition, the generation yield of acetone during photocatalytic processes for IPA at sub-ppm levels was examined. The surface characteristics of prepared S-and N-TiO2 photocatalysts were analyzed to indicate that they could be effectively activated by visible-light irradiation. Regarding both types of photocatalysts, the cleaning efficiency of IPA increased as the air flow rate (AFR) was decreased. The average cleaning efficiency determined via the S-TiO2 system for the AFR of 2.0 L min -1 was 39%, whereas it was close to 100% for the AFR of 0.1 L min -1. Regarding the N-TiO2 system, the average cleaning efficiency for the AFR of 2.0 L min -1 was above 90%, whereas it was still close to 100% for the AFR of 0.1 L min -1 . In contrast to the cleaning efficiencies of IPA, both types of photocatalysts revealed a decreasing trend in the generation yields of acetone with decreasing the AFR. Consequently, the N-TiO2 system was preferred for cleaning of sub-ppm IPA to S-TiO2 system and should be operated under low AFR conditions to minimize the acetone generation. In addition, 8-W daylight lamp exhibited higher cleaning efficiency of IPA than for visible LEDs.

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Section: Surface Characteristics Of Photocatalystssupporting

confidence: 92%

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

2012

Clean Technology

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“…It can be observed that the synthesized TiO 2 powder consists of pure anatase (curve 1). The pattern of TiO 2 Degussa P25 powder (curve 3) exhibited both anatase and rutile crystalline polymorphs in a wt % ratio A: R = 88: 12 (Table 1), which is in accordance with recently reported values in the literature [14,15]. After the doping procedure, the crystalline structure of each powder was preserved (curves 2 and 4) due to the temperature of thermal treatment which was only 50 °C higher than the calcination temperature of the undoped powder and below the temperature of anatase-to-rutile phase transition.…”

Section: Characteristics Of Catalystssupporting

confidence: 90%

Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

et al. 2010

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Abstract:The work describes a study of the oxidation power of N-doped and undoped anatase TiO 2 , as well as TiO 2 Degussa P25 suspensions for photocatalytic degradation of the herbicides propionic acid (mecoprop) and 3,6-dichloropyridine-2-carboxylic acid (clopyralid) using visible and UV light. Undoped nanostructured TiO 2 powder in the form of anatase was prepared by a sol-gel route. The synthesized TiO 2 , as well as TiO 2 Degussa P25 powder, were modified with urea to introduce nitrogen into the structure. N-doped TiO 2 appeared to be somewhat more efficient than the starting TiO 2 (anatase) powder when visible light was used for mecoprop degradation. N-doped TiO 2 Degussa P25 was also slightly more efficient than TiO 2 Degussa P25. However, under the same experimental conditions, no degradation of clopyralid was observed in the presence of any of the mentioned catalysts. When the kinetics of mecoprop degradation was studied using UV light, more efficient were the undoped powders, while in the case of clopyralid, N-doped TiO 2 Degussa P25 powder was most efficient, which is probably a consequence of the difference in the molecular structure of the two herbicides. OPEN ACCESSMolecules 2010, 15 2995

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“…For instance, TiO 2 , as the most attention photocatalyst, is low cost, nontoxic and long term stability, especially P25 is a well known commercial material containing anatase and rutile phases which is best for photocatalytic process, and it is widely used in degradation of pollutants, as one kind of bacteriostat, catalytic synthesis area, et al However, it possesses shortcoming of wide band gap and narrow optical absorption range which limited the low quantum efficiency and have hindered its practical application for removal pollutants [4][5][6][7]. Therefore, there are many approaches for modified P25 (TiO 2 ), such as doping with metal and/or nonmetal elements, compound other semiconductors, surfaced sensitization, et al Aiming to reduce the photo-generated charge recombination during the photocatalytic processes, and/or extend the responded light range in the solar [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Melamine modified P25 with heating method and enhanced the photocatalytic activity on degradation of ciprofloxacin

Wang

et al. 2015

Applied Surface Science

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Enhanced photocatalytic activity for degrading Rhodamine B solution of commercial Degussa P25 TiO2 and its mechanisms

Cited by 136 publications

References 27 publications

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

Photocatalytic Degradation of Mecoprop and Clopyralid in Aqueous Suspensions of Nanostructured N-doped TiO2

Melamine modified P25 with heating method and enhanced the photocatalytic activity on degradation of ciprofloxacin

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