Graphitic-C(3)N(4)-hybridized TiO(2) nanosheets with reactive {001} facets to enhance the UV- and visible-light photocatalytic activity.

AnataseTiO(2)nanosheets with dominant {001} facets were hybridized with graphitic carbon nitride (g-C(3)N(4)) using a facile solvent evaporation method. On top of the superior photocatalytic performance of highly reactive {001} facets, the hybridization with g-C(3)N(4) is confirmed to further improve the reactivity through degrading a series of organic molecules under both UV- and visible-light irradiation. It is proposed that an effective charge separation between g-C(3)N(4) and TiO2 exists in the photocatalytic process, i.e., the transferring of photogenerated holes from the valence band (VB) of TiO(2) to the highest occupied molecular orbital (HOMO) of g-C(3)N(4), and the injecting of electrons from the lowest unoccupied molecular orbital (LUMO) of g-C(3)N(4) to the conduction band (CB) of TiO(2). Due to this synergistic effect, the enhancement of UV- and visible-light photoactivity over the hybrid is achieved. Furthermore, it has been revealed that holes were the main factor for the improved photoactivity under UV-light, while the OH radicals gained the predominance for degrading organic molecules under visible-light. Overall, this work would be significant for fabricating efficient UV-/visible-photocatalysts and providing deeper insight into the enhanced mechanisms of π-conjugated molecules hybridized semiconductors.

Gu L ，Wang J ，Zou Z ，Han X ... -  《-》

Preparation of graphitic carbon nitride (g-C₃N₄)/WO₃ composites and enhanced visible-light-driven photodegradation of acetaldehyde gas.

Novel visible-light-driven graphitic carbon nitride (g-C₃N₄)/WO₃ composite photocatalysts were prepared, and the acetaldehyde (CH₃CHO) degradation activity of these composites was evaluated. The prepared g-C₃N₄/WO₃ composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflection spectroscopy (UV-vis), and the N₂ gas adsorption Brunauer-Emmett-Teller (BET) method (N₃-BET). The WO₃ particles, which were 100-300 nm in size, were in direct contact with the g-C₃N₄ sheet surface. The optical band gap and specific surface area of the g-C₃N₄/WO₃ composites were in the range of 2.65-2.75 eV and 4-7 m(2)/g, respectively. The g-C₃N₄/WO₃ composites exhibited higher activity for the photodegradation of CH₃CHO under visible light irradiation compared to g-C₃N₄. The optimal WO₃ content for the CH₃CHO photodegradation activity of the heterojunction structures was determined. The synergistic effect of g-C₃N₄ and WO₃ was considered to lead to improved photogenerated carrier separation. A possible degradation mechanism of CH₃CHO over the g-C₃N₄/WO₃ composite photocatalyst under visible light irradiation was proposed. These results should usefully expand applications of g-C₃N₄ as a visible-light-driven photocatalyst.

Katsumata K ，Motoyoshi R ，Matsushita N ，Okada K ... -  《-》

Nitrogen and sulfur co-doped TiO2 nanosheets with exposed {001} facets: synthesis, characterization and visible-light photocatalytic activity.

Xiang Q ，Yu J ，Jaroniec M 《-》

Enhanced photocatalytic H₂-production activity of graphene-modified titania nanosheets.

Xiang Q ，Yu J ，Jaroniec M 《-》

Facile synthesis and enhanced visible-light photocatalysis of graphitic carbon nitride composite semiconductors.

The semiconductor heterojunction has been an effective architecture to enhance photocatalytic activity by promoting photogenerated charge separation. Here, graphitic carbon nitride (CN) and B-modified graphitic carbon nitride (CNB) composite semiconductors were fabricated by a facile calcination process using cheap, sustainable, and easily available sodium tetraphenylboron and urea as precursors. The synthetic CN-CNB-25 semiconductor with a suitable CNB content showed the highest visible-light activity. Its degradation ratio for methyl orange and phenol was more than twice that of CN and CNB and its H2 evolution rate was ∼3.4 and ∼1.8 times higher than that of CN and CNB, respectively. It also displayed excellent stability and reusability. The enhanced activity of CN-CNB-25 was attributed predominantly to the efficient separation of photoinduced electrons and holes. This paper describes a visible-light-responsive CN composite semiconductor with great potential in environmental and energy applications.

Li H ，Liu Y ，Gao X ，Fu C ，Wang X ... -  《-》