Influence of thermal treatment on the structure and photocatalytic activity of TiO2 P25

Machado, Nádia Regina Camargo Fernandes; Santana, Veronice Slusarski

doi:10.1016/j.cattod.2005.07.022

Cited by 109 publications

(42 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…4c). This effect of increase in the specific surface area for vacuum annealed samples was also observed in [16].…”

Section: Specific Bet Surface Areasupporting

confidence: 60%

“…The influence of the thermal treatment in air on the structure and the photocatalytic activity of TiO 2 P25 (P25 not treated, and annealed at 200, 300, 400, 500, 600 and 700 • C) was studied by Fernandes Machado and Santana [16]. The greatest activity for phenol degradation was obtained with untreated (original) TiO 2 P25 [16].…”

Section: Discussionmentioning

confidence: 99%

“…Before, it should be emphasized that TiO 2 nanopowders prepared by different methods can have not only different morphology and different surface chemical composition, but also different crystal compositions. For this reason, all the experimental results can be divided into two classes, namely, into results obtained with powders prepared by different methods [9][10][11][12][13] and into results obtained with P25 powders [14][15][16][17]. It should be emphasized that no studies of changes in surface chemical composition along with a thermal treatment were done in all the above mentioned experimental studies.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

An improvement of photocatalytic activity of TiO2 Degussa P25 powder

Bessergenev

Mateus

Rego

et al. 2015

Applied Catalysis A: General

View full text Add to dashboard Cite

a b s t r a c tThe photocatalytic activities of Degussa P25 powders annealed at various temperatures in vacuum and air were studied together with investigations of their compositions by XPS, of their crystal structures by XRD and of their specific surface areas by BET. It is shown that the photocatalytic activity of P25 powders was remarkably enhanced after vacuum annealing; the kinetic coefficient can be raised by 75% during annealing at 400 • C. It is obvious that this enhancement is not related to the adhesion ability of the P25 powders.

show abstract

“…4c). This effect of increase in the specific surface area for vacuum annealed samples was also observed in [16].…”

Section: Specific Bet Surface Areasupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

An improvement of photocatalytic activity of TiO2 Degussa P25 powder

Bessergenev

Mateus

Rego

et al. 2015

Applied Catalysis A: General

View full text Add to dashboard Cite

show abstract

“…pH of the zero charge (pHzpc) for photocatalysts were determined according to the procedures outlined by Machado and Santana [12]. A series of 50 mL ultra-pure water with different pH ranging from pH 2 to 10 was prepared.…”

Section: Determination Of Point Of the Zero Charge (Phzpc) For The Unmentioning

confidence: 99%

Carbon Nitrogen Co-Doped P25: Parameter Study on Photodegradation of Reactive Red 4

Jalil

Nawawi

Ishak

et al. 2016

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. Photocatalytic degradation rate of reactive red 4 (RR4) using carbon coated nitrogen doped TiO2 (C N co-doped TiO2) in photocatalysis process is main goal on this research. The main operating the parameters such as effect of initial dye concentration, catalyst loading, aeration flow rate and initial pH on degradation of RR4 under 45 W fluorescent lamp was investigated. photocatalytic activity of RR4 dye decreased with increasing RR4 dye concentration. The optimum loading is around 0.04 g and optimum aeration rate is about 25 mL min -1 of C N co-doped TiO2. Effect of pH was conducted based on the optimum loading and conclude that the photocatalytic degradation of RR4 became faster at pH 2 -7. For the future work, the modification of doping with others element like non-metal or metal with C N co-doped TiO2 can be enhanced toward the higher efficieny of photodegradation under visible light. Moreover, the immobilized technique can be used in future to overcome the difficulty of filtration on suspension.

show abstract

“…The diffraction line related to mineral impurities such as quartz and muscovite of the raw diatomite disappeared after purification. These impurities adhere to diatom and block pores (see which was prepared under the same condition [26,27], the crystalline phase transformation from anatase to rutile phase of TiO 2 particles has been retarded. It…”

Section: Crystalline Phase Studiesmentioning

confidence: 99%

Synthesis, characterization and activity of an immobilized photocatalyst: Natural porous diatomite supported titania nanoparticles

Wang

Godoi

Sun

et al. 2015

Journal of Colloid and Interface Science

120

View full text Add to dashboard Cite

Diatomite, a porous non-metal mineral, was used as support to prepare TiO 2 /diatomite composites by a modified sol-gel method. The as-prepared composites were calcined at temperatures ranging from 450 to 950 o C. The characterization tests included X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with an energy-dispersive X-ray spectrometer (EDS), High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption/desorption measurements. The XRD analysis indicated that the binary mixtures of anatase and rutile exist in the composites. The morphology analysis confirmed the TiO 2 particles were uniformly immobilized on the surface of diatom with a strong interfacial anchoring strength, which leads to few drain of photocatalytic components during practical applications. In further XPS studies of hybrid catalyst, we found the evidence of the presence of Ti-O-Si bond and increased percentage of surface hydroxyl. In addition, the adsorption capacity and photocatalytic activity of synthesized TiO 2 /diatomite composites were evaluated by studying the degradation kinetics of aqueous Rhodamine B under UV-light irradiation.The photocatalytic degradation was found to follow pseudo-first order kinetics according to the Langmuir-Hinshelwood model. The preferable removal efficiency was observed in composites by 750 o C calcination, which is attributed to a relatively 2 appropriate anatase/rutile mixing ratio of 90/10.

show abstract

Influence of thermal treatment on the structure and photocatalytic activity of TiO2 P25

Cited by 109 publications

References 26 publications

An improvement of photocatalytic activity of TiO2 Degussa P25 powder

An improvement of photocatalytic activity of TiO2 Degussa P25 powder

Carbon Nitrogen Co-Doped P25: Parameter Study on Photodegradation of Reactive Red 4

Synthesis, characterization and activity of an immobilized photocatalyst: Natural porous diatomite supported titania nanoparticles

Contact Info

Product

Resources

About