Band gap-tunable alkali metal modified graphitic carbon nitride was prepared by a molten salt method. X-ray diffraction, N2 isothermal sorption, ultraviolet-visible spectroscopy, scanning electron microscope, X-ray ph...Band gap-tunable alkali metal modified graphitic carbon nitride was prepared by a molten salt method. X-ray diffraction, N2 isothermal sorption, ultraviolet-visible spectroscopy, scanning electron microscope, X-ray photoelectron spectroscopy and photoluminescence were used to characterize the obtained cat-alysts. The photocatalytic H202 production ability of as-prepared catalyst was investigated. The results indicate that K＋ and Na＊ are doped into g-CBN4 lattice simultaneously by the molten salt method. Alkali metal modification not only promotes the specific surface area, visible light absorption and separation of electron-hole pairs, but tunes the conduction band and valence band edge positions of as-prepared catalysts by controlling the weight ratio of eutectic salts to melamine. The tunable band edge positions result in the photocatalytic H202 production from ＂single channel pathway＂ to ＂two channel pathway＂, leading to the promoted H202 production ability.展开更多
基金supported financially by the Fund of Education Department of Liaoning Province(No.L2014145)Natural Science Foundation of Liaoning Province(No.201602467)
文摘Band gap-tunable alkali metal modified graphitic carbon nitride was prepared by a molten salt method. X-ray diffraction, N2 isothermal sorption, ultraviolet-visible spectroscopy, scanning electron microscope, X-ray photoelectron spectroscopy and photoluminescence were used to characterize the obtained cat-alysts. The photocatalytic H202 production ability of as-prepared catalyst was investigated. The results indicate that K＋ and Na＊ are doped into g-CBN4 lattice simultaneously by the molten salt method. Alkali metal modification not only promotes the specific surface area, visible light absorption and separation of electron-hole pairs, but tunes the conduction band and valence band edge positions of as-prepared catalysts by controlling the weight ratio of eutectic salts to melamine. The tunable band edge positions result in the photocatalytic H202 production from ＂single channel pathway＂ to ＂two channel pathway＂, leading to the promoted H202 production ability.
