Heterogeneous photocatalysis

Fox, Marye Anne; Dulay, Maria T.

doi:10.1021/cr00017a016

Cited by 4,168 publications

(2,529 citation statements)

References 59 publications

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“…30 All samples exhibited the typical absorption with an intense transition in the UV region of the spectra except the purified MWCNTs attributing to the electron transition of TiO 2 from the valence band to conduction band. 10,31,44 Further investigation indicated that no obvious variation for the absorption intensity in UV region was observed for the composite photocatalysts with different MWCNTs contents. This might be because that the MWCNTs were mostly covered by the TiO 2 spheres.…”

Section: Characterization Of Structure and Morphologymentioning

confidence: 94%

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Chen

Nie

et al. 2012

ACS Appl. Mater. Interfaces

133

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ABSTRACT:The carbon nanotube (CNT)−sub-micrometer-sized anatase TiO 2 sphere composite photocatalysts were synthesized by a facile one-step hydrothermal method using titanium tetrafluoride as titanium source and CNTs as structure regulator. Various technologies including X-ray diffraction, UV−visible absorption spectra, N 2 adsorption−desorption, scanning electron microscopy, and transmission electron microscopy were employed to characterize the structure properties of the prepared composite photocatalysts. The results indicated that the composite photocatalysts consisted of CNTs wrapping around the sub-micrometer-sized anatase TiO 2 spheres with controllable crystal facets and that the aggregated particles with average diameter ranged from 200 to 600 nm. The fabricated composite photocatalysts were used to degrade gaseous styrene in this work. As expected, a synergistic effect that remarkably enhancing the photocatalytic degradation efficiency of gaseous styrene by the prepared composite photocatalysts was observed in comparison with that the degradation efficiency using pure anatase TiO 2 and the adsorption of CNTs. Similar results were also confirmed in the decolorization of liquid methyl orange. Further investigation demonstrated that the synergistic effect in the photocatalytic activity was related to the structure of the sub-micrometer-sized anatase TiO 2 spheres and the significant roles of CNTs in the composite photocatalysts. By controlling the content of CNTs, the content of TiO 2 or the temperature during the hydrothermal synthesis process, anatase TiO 2 spheres with controllable crystallite size and dominant crystal facets such as {001}, {101}, or polycrystalline could be obtained, which was beneficial for the increase in the synergistic effect and further enhancement of the photocatalytic efficiencies.

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Section: Characterization Of Structure and Morphologymentioning

confidence: 94%

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Chen

Nie

et al. 2012

ACS Appl. Mater. Interfaces

133

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“…25 The rates and efficiencies of photo-assisted degradation with TiO 2 are significantly improved in the presence of oxygen or by the addition of several inorganic oxidizing species, such as peroxydisulfate, periodate, and peroxide. 26 We applied photocatalytic degradation process to 1·10 -4 M atrazine concentration which has been found in polluted water. One of our purposes is to transform very toxic atrazine concentration in non toxic products, using the lowest possible energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Atrazine Toxicity Reduction Following H₂O₂/TiO₂‐Photocatalyzed Reaction and Comparison with H₂O₂‐Photolytic Reaction

Campanella

Vitaliano

2006

Annali di Chimica

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Summary -An atrazine photodegradation study carried out by a Q-Panel suntest apparatus is reported in this work. H 2 O 2 /TiO 2 photocatalyzed reaction yield and parameters (time, irradiance, temperature, H 2 O 2 (40%) volume, TiO 2 amount) were exactly determined relating to the used atrazine concentration. An experimental kinetic study was performed to establish the reaction order in fixed conditions. Using a biosensor method, 10 -4 M Atrazine solution toxicity and final photocatalytic reaction solution toxicity were quantitatively determined. A consistent toxicity decrease was observed on passing from the analyte to the products of the photocatalytic reaction. An analogous photolytic reaction carried out in absence of TiO 2 , but in the same experimental conditions of time, irradiance, temperature and H 2 O 2 volume, brings to a toxicity increase.

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“…Although metal oxides and chalcogenides have been by far the most studied photocatalysts due to their well-known semiconducting properties, [19][20][21][22] there is an increasing interest in exploiting and developing photocarbocatalysts. [23][24][25][26] Photocarbocatalysis refers to the use of metal-free carbonaceous materials as photocatalysts and is aimed at replacing costly and critical metals using biomass as sustainable from renewable resources.…”

Section: Graphene Oxide In Photobiocatalysismentioning

confidence: 99%

Photobiocatalysis: The Power of Combining Photocatalysis and Enzymes

Maciá-Agulló

Corma

Garcı́a

2015

Chemistry A European J

137

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Photobiocatalysts are constituted by a semiconductor with or without light harvester that activates an enzyme. A logical source of inspiration for the development of photobiocatalysts has been natural photosynthetic centers. In photobiocatalysis, the coupling of the semiconductor and the enzyme frequently requires of the natural cofactor and a relay transferring charge carriers from the semiconductor. The most widely studied photobiocatalysts so far make use of conduction band electrons of excited semiconductor to promote enzymatic reductions mediated by NAD + /NADH and an electron relay. The present review presents the state of the art in the field and has been organized based on the semiconductor and the reaction type including oxidations, hydrogen generation, CO 2 reduction. The possibility of direct enzyme activation by the semiconductor and the influence of the nature of mediator are also discussed as well as the use of mimics of enzyme active center in combination with the semiconductor. The final section summarizes the state of the art of photobiocatalysis and comments on our view on future developments of the field.

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Heterogeneous photocatalysis

Cited by 4,168 publications

References 59 publications

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Atrazine Toxicity Reduction Following H₂O₂/TiO₂‐Photocatalyzed Reaction and Comparison with H₂O₂‐Photolytic Reaction

Photobiocatalysis: The Power of Combining Photocatalysis and Enzymes

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Heterogeneous photocatalysis

Cited by 4,168 publications

References 59 publications

Synthesis of Carbon Nanotube–Anatase TiO2 Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Synthesis of Carbon Nanotube–Anatase TiO2 Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Atrazine Toxicity Reduction Following H2O2/TiO2‐Photocatalyzed Reaction and Comparison with H2O2‐Photolytic Reaction

Photobiocatalysis: The Power of Combining Photocatalysis and Enzymes

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Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Synthesis of Carbon Nanotube–Anatase TiO₂ Sub-micrometer-sized Sphere Composite Photocatalyst for Synergistic Degradation of Gaseous Styrene

Atrazine Toxicity Reduction Following H₂O₂/TiO₂‐Photocatalyzed Reaction and Comparison with H₂O₂‐Photolytic Reaction