Visible light induced photoreduction of methyl orange by N-doped mesoporous titania

Joshi, Meenal; Labhsetwar, Nitin; Mangrulkar, Priti A.; Tijare, Saumitra N.; Kamble, Sanjay P.; Rayalu, Sadhana

doi:10.1016/j.apcata.2008.12.030

Cited by 90 publications

(46 citation statements)

References 24 publications

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“…In the case of doping at a high concentration, metal ions can behave as recombination centers. Joshi et al [75] reported the adverse effect of doping TiO 2 with transition metal ions on photocatalytic activity because of the formation of localized d-states in the band gap of TiO 2 . Localized d-states act as trapping sites that capture electrons from the conduction band or holes from the valence band.…”

Section: Doping With Transition Metal Cationsmentioning

confidence: 99%

“…Electron transfer from one of these levels to the conduction band requires lower photon energy than in the situation of an unmodified semiconductor. TiO 2 has been doped with many different transition metals [72][73][74][75][76][77][78][79][80][81][82][83][84][85][86]. Grätzel et al [73] studied the effect of doping TiO 2 with transition metals such as Fe, V, and Mo by electron paramagnetic resonance.…”

Section: Doping With Transition Metal Cationsmentioning

confidence: 99%

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A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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Section: Doping With Transition Metal Cationsmentioning

confidence: 99%

Section: Doping With Transition Metal Cationsmentioning

confidence: 99%

A review of TiO2 nanoparticles

2011

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“…The FT-IR spectrum of carboxyl RHC shows absorption at 1714 cm −1 which is characteristic of CvO stretching vibration, owing to the existence of COOH and absorption at 1573 cm −1 which is attributed to asymmetric -COO-stretching. 20 After calcination, the peak from COOH groups disappeared as evidenced by the spectra of both [24][25][26][27] It should be noted that no band shift was detected for Fe/Fe 3 O 4 /carbon in comparison with RHC. However, a distinct G band p-shift of 12 cm −1 was observed for the sample of Fe/Fe 3 O 4 /N-carbon, which could be explained by the N-doping of the composite, as reported by others.…”

Section: Resultsmentioning

confidence: 93%

A Fe/Fe₃O₄/N-carbon composite with hierarchical porous structure and in situ formed N-doped graphene-like layers for high-performance lithium ion batteries

Meng

Zhu

et al. 2015

Dalton Trans.

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2015). A Fe/Fe3O4/N-carbon composite with hierarchical porous structure and in situ formed N-doped graphene-like layers for high-performance lithium ion batteries. Dalton Transactions: an international journal of inorganic chemistry, 44 (10), 4594-4600. A Fe/Fe3O4/N-carbon composite with hierarchical porous structure and in situ formed N-doped graphene-like layers for high-performance lithium ion batteries AbstractFe/Fe3O4/N-carbon composite consisting of a porous carbon matrix containing a highly conductive Ndoped graphene-like network and Fe/Fe3O4 nanoparticles was prepared. The porous carbon has a hierarchical structure which is inherited from rice husk and the N-doped graphene-like network formed in situ. When used as an anode material for lithium batteries, the composite delivered a reversible capacity of approximately 610 mA h g(-1) at a current density of 200 mA g(-1) even after 100 cycles, due to the synergism between the unique hierarchical porous structures, highly electrically conductive N-doped graphene-like networks and nanosized particles of Fe/Fe3O4. This work provides a simple approach to prepare N-doped porous carbon activated nanoparticle composites which could be used to improve the electrochemical performance of lithium ion batteries. hierarchical structure which is inherited from rice husk and the N-doped graphene-like network formed in situ. When used as an anode material for lithium batteries, the composite delivered a reversible capacity of approximately 610 mA h g −1 at a current density of 200 mA g −1 even after 100 cycles, due to the synergism between the unique hierarchical porous structures, highly electrically conductive N-doped graphene-like networks and nanosized particles of Fe/Fe 3 O 4 . This work provides a simple approach to prepare N-doped porous carbon activated nanoparticle composites which could be used to improve the electrochemical performance of lithium ion batteries.

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“…It is well known that even low amount of dopants considerably increases titania photoactivity. [40] Indeed, the catalytic tests shown in Figure 6 show that the presence of chitosan within the synthetic process increases the effectiveness displayed by the T sample in NO photooxidation from 32 % to 50% for Ch 0,2 T (green cylinder) and to 47% for Ch 0,4 T (violet cylinder).…”

Section: Chitosan Effect On the Photocatalystsmentioning

confidence: 99%

“…This natural polyglucosamine, deriving from chitin deacetylation, has been chosen for its large availability, sustainability, low cost and the co-presence of carbon and nitrogen. [40] Therefore, the goal of the present study is to synthesise an efficient C and N co-doped titania photocatalysts using chitosan as source of dopants. This innovative approach to dope simultaneously titania with C and N by using a natural source, at the best of our knowledge, has never been tried for photocatalytic applications and it could be a viable option for photocatalytic NO x removal under visible light.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

et al. 2017

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Global society is constantly seeking for sustainable and effective processes to fight environmental pollution. The abatement\ud of NO, a class of hazardous contaminants, can be performed by means of photocatalytic oxidation using titaniabased photocatalysts. Non-metal doping is highly desirable for an efficient exploitation of solar light. The co-presence of nitrogen and carbon represents an appealing possibility though their introduction generally requires post-synthesis treatments. Otherwise, in this work carbon and nitrogen have been introduced in titania photocatalysts simultaneously by a onepot synthetic approach using a natural and sustainable source of dopants, namely chitosan. Several synthetic parameters have been changed in order to evaluate their effect on the physicochemical properties of the final materials and to establish structure-activity relationship as for the photocatalytic performances in NOx oxidation under visible light irradiation

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Visible light induced photoreduction of methyl orange by N-doped mesoporous titania

Cited by 90 publications

References 24 publications

A review of TiO2 nanoparticles

A review of TiO2 nanoparticles

A Fe/Fe₃O₄/N-carbon composite with hierarchical porous structure and in situ formed N-doped graphene-like layers for high-performance lithium ion batteries

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

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