Tianjin Key Laboratory Of Compos And Funct Materials And Key Laboratory Of Advanced Ceramics And Machining Technology

Tianjin, China

Tianjin Key Laboratory Of Compos And Funct Materials And Key Laboratory Of Advanced Ceramics And Machining Technology

Tianjin, China

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Li Y.,Tianjin University | Xu H.,Tianjin University | Xu H.,Tianjin Key Laboratory Of Compos And Funct Materials And Key Laboratory Of Advanced Ceramics And Machining Technology | Ouyang S.,Tianjin University | And 8 more authors.
Journal of Materials Chemistry A | Year: 2016

Surface-alkalinization over g-C3N4 was realized by an in situ synthesis approach of introducing KCl and NH4Cl during the polymerization of melamine. The characterization of the Fourier transform-infrared spectrum, X-ray photoelectron spectrum, and electron spin resonance spectrum over the sample synthesized in the presence of KCl/NH4Cl and other reference samples indicated that the K ions played an essential role in breaking the periodic chemical structure of g-C3N4 and meanwhile the trace amount of H2O in melamine could supply OH ions to graft hydroxyl groups. The NH4Cl mainly contributed to exfoliation of layered g-C3N4 particles and pushing negative shift of the conduction-band level based on the measurements of the BET surface area and valence-band X-ray photoelectron spectrum. An optimal sample, g-C3N4-KCl/0.1 g NH4Cl (CN-KCl/0.1 g NH4Cl), achieved a more than 14-fold enhancement in photocatalytic H2 evolution under visible-light irradiation compared with the pristine g-C3N4. The enhanced photocatalytic efficiency could be attributed to the fact that the surface hydroxyl groups and the more negative conduction-band level can promote the separation of photocarriers and offer a stronger potential for water reduction, respectively. © The Royal Society of Chemistry 2016.

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