Catalytic processes activated by light

Galian, Raquel E.; Pérez‐Prieto, Julia

doi:10.1039/c0ee00003e

Cited by 52 publications

(26 citation statements)

References 59 publications

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“…However, different C-doping species or multi-level oxygen vacancies (O vac ) would co-existed in the resultant C-doped ZnO materials, 7,23 resulting in the difficulty to clarify their origin of visible-light response, so did C-doped TiO 2 . 16,18,19 In principle, light C-doping may extend visible-light absorption and promote their visiblelight-driven photocatalysis, 8,12,23,24 while heavy C-doping is highly possible to cause recombination of photogenerated charge carriers.…”

Section: 14mentioning

confidence: 99%

“…[1][2][3][4] Among various photocatalysts, ZnO and TiO 2 are most plausible due to their high photosensitivity, nontoxicity, low cost, though they can only utilise a small portion of solar energy (3-5%) in the UV region owing to their large bandgap. [5][6][7][8] Similar to TiO 2 , ZnO possesses great potential in modulation of bandgap for harvesting visible light but it is easier to crystallise and use in the manufacture of devices.…”

Section: Introductionmentioning

confidence: 99%

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Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

et al. 2015

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C-doped ZnO with a large surface area was prepared via F127-assisted pyrolysis at 500 C and used for visible-light-responsive photocatalytic water purification. The band structure of the C-doped ZnO was investigated using valance band XPS and DFT simulation. The C-doped ZnO possessed enhanced absorption of UV and visible light, though it showed lower visible-light-responsive photocatalytic activity than ZnO because of significant recombination of photogenerated charge carriers arising from overloaded C-dopant and oxygen vacancies.

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Section: 14mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

et al. 2015

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“…[3,4] This degradation under optimal conditions can lead to mineralization of organic contaminants to CO 2 ,H 2 O, and ions (chloride, sulfate, or nitrates,d epending on their chemical nature). [8] Most of these studies have employed anatase, which is the most photocatalytically active crystalline structure of TiO 2 ,w ith an onset of absorption of l % 387 nm and ab and gap energy (E bg )o fa bout 3.2 eV. [5] Undoubtedly,s emiconductor photocatalystsb ased on TiO 2 are beingw idely studied for applications in environmental remediation ands olar energyc onversion.…”

Section: Introductionmentioning

confidence: 99%

A Metal‐Free, Nonconjugated Polymer for Solar Photocatalysis

Irigoyen-Campuzano

González‐Béjar

Pino

et al. 2017

Chemistry A European J

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Heterogeneous catalysts that can absorb light over the solar range are ideal for green photocatalysis. Recently, attention has been directed towards the generation of novel solar-light photocatalysts, in particular, metal-free polymers. Herein, it is demonstrated that a metal-free, nonconjugated, anthraquinone-based copolymer (poly[1,4-diamine-9,10-dioxoanthracene-alt-(benzene-1,4-dioic acid)] (COP)) with a strong absorption in the visible region is effective as a sunlight heterogeneous photocatalyst. As a proof of concept, it has been used to mineralize 2,5-dichlorophenol (2,5-DCP) in water under air and sunlight irradiation. The photocatalytic efficiency of COP compares well with that of TiO -P25 when the reaction is carried out in a solar photoreactor in acid medium. Steady-state and time-resolved (absorption and emission) studies performed on COP suspended in 6:4 DMF/H O have provided valuable information about the COP species generated under different pH conditions. Steady-state absorption and fluorescence data are consistent with the existence of a tautomeric equilibrium between the 9,10-keto and 1,10-iminoketo quinoid forms for the anthraquinone in the ground state. Moreover, in basic media, transient absorption measurements showed the presence of two bands ascribed to the tautomeric triplet excited states, whereas only one of the triplets was observed in acid medium. A mechanism for the photocatalyzed degradation of 2,5-DCP by COP is proposed on the basis of these observations.

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“…Die nachhaltige Chemie ist auf den Entwurf von chemischen Prozessen fokussiert, welche minimalen Einfluss auf die Umwelt nehmen und die Verschmutzung schon an der Quelle zu vermeiden suchen. [1][2][3][4][5] Die Optimierung existierender chemischer Prozesse sowie die Entwicklung neuer, unweltfreundlicher Reaktionen hängt zu einem großen Teil von der Verbesserung der Leistungsfähigkeit von Katalysatoren ab. [6] Die Katalyseforschung bestimmt damit die Entwicklung der modernen nachhaltigen Chemie.…”

Section: Introductionunclassified

Polymeres graphitisches Kohlenstoffnitrid als heterogener Organokatalysator: von der Photochemie über die Vielzweckkatalyse hin zur nachhaltigen Chemie

2011

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Polymere graphitische Kohlenstoffnitrid‐Materialien (vereinfacht g‐C3N4), die nur aus C, N und Spuren von H bestehen, sind in den letzten Jahren wieder verstärkt in das Zentrum des Interesses gerückt, wohl auch wegen der Ähnlichkeit zu Graphit. g‐C3N4 ist anders als Graphit ein Halbleiter mit mittlerer Bandlücke und damit ein effektiver (Photo)‐Katalysator für eine ganze Reihe von Reaktionen. In diesem Aufsatz beschreiben wir die “Polymerchemie” des synthetischen Aufbaus, wie die Bandlagen und die Bandlücke durch Copolymerisation und Dotierung verändert werden können und wie Änderungen der Festkörpertextur die Effektivität dieses heterogenen Organokatalysators verbessern können. g‐C3N4 und seine Modifikationen zeigen eine sehr hohe thermische und chemische Stabilität und katalysieren eine ganze Reihe von “Traumreaktionen”, wie die photochemische Spaltung von Wasser, milde und selektive Oxidationsreaktionen, oder – als coaktiver Katalysatorträger – superschnelle Hydrierungen. Da Kohlenstoffnitrid metallfrei ist, toleriert es funktionelle Gruppen und ist daher für Vielzweckanwendungen in der Umwandlung von Biomasse und in der nachhaltigen Chemie geeignet.

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Catalytic processes activated by light

Cited by 52 publications

References 59 publications

Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

Visible-light photocatalysis on C-doped ZnO derived from polymer-assisted pyrolysis

A Metal‐Free, Nonconjugated Polymer for Solar Photocatalysis

Polymeres graphitisches Kohlenstoffnitrid als heterogener Organokatalysator: von der Photochemie über die Vielzweckkatalyse hin zur nachhaltigen Chemie

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