In this work, we report the construction of three-dimensional(3D) CdS nanosphere/graphene networks by a one-step hydrothermal self-assembly route. The 3D graphene networks not only enhance the light scattering, thanks...In this work, we report the construction of three-dimensional(3D) CdS nanosphere/graphene networks by a one-step hydrothermal self-assembly route. The 3D graphene networks not only enhance the light scattering, thanks to the interconnected 3D architecture, but also improve the crystallinity of deposited CdS nanospheres, and at the same time provide a direct electron pathway to quickly separate the photogenerated electron-hole pairs from CdS, which thus dramatically improve the photocatalytic activity.The optimized 3D CdS nanosphere/graphene networks with 2 wt% of graphene could produce molecular hydrogen at a rate of 2310 μmol gcatalyst^(-1) h^(-1) under visible-light illumination(λ > 400 nm).展开更多
Photocatalytic mineralization of recalcitrant contaminants like phenol in wastewater requires abundant hydroxyl radicals(·OH) to initiate the reaction prior to the ring-opening. We here increase the free energy f...Photocatalytic mineralization of recalcitrant contaminants like phenol in wastewater requires abundant hydroxyl radicals(·OH) to initiate the reaction prior to the ring-opening. We here increase the free energy for adsorption of O~* species on TiOsurface and slightly downshift the band position by tin doping. This can simultaneously promote the generation and suppress the annihilation of ·OH. Besides, tin doping can also facilitate semiconductor-cocatalyst-solution(SCS) interfacial electron transfer by lowering the potential barrier and synergistically enhance the photon utilization. By filming the photocatalyst onto our developed fixed bed reactors, the loss of photons resulting from undesirable absorption by contaminants can be alleviated. By these virtues, trace amount of phenol in wastewater can be efficiently mineralized.展开更多
基金supported by the National Natural Science Foundation of China (no. 91545116 and U1510108)Pioneer ‘‘Hundred Talents Program’’ of CAS, Start-Up Grant of Institute of Coal Chemistry (2016SCXQT01)+3 种基金Singapore Agency for Science, Technology and Research (A*Star)Science and Engineering Research Council- Public Sector Funding (PSF): 1421200075Singapore Ministry of Education Academic Research Fund (AcRF) Tier 1: RG10/16 and RG111/15State Key Laboratory of Coal Conversion (J17-18-913-1, J15-16913)
文摘In this work, we report the construction of three-dimensional(3D) CdS nanosphere/graphene networks by a one-step hydrothermal self-assembly route. The 3D graphene networks not only enhance the light scattering, thanks to the interconnected 3D architecture, but also improve the crystallinity of deposited CdS nanospheres, and at the same time provide a direct electron pathway to quickly separate the photogenerated electron-hole pairs from CdS, which thus dramatically improve the photocatalytic activity.The optimized 3D CdS nanosphere/graphene networks with 2 wt% of graphene could produce molecular hydrogen at a rate of 2310 μmol gcatalyst^(-1) h^(-1) under visible-light illumination(λ > 400 nm).
基金National Natural Science Foundation of China(Nos.22172185,21773285,and U1932128)CAS Western Youth Scholars Program(No.XAB2019AW09)+2 种基金Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province(No.20220051)CAS Pioneer“Hundred Talents Program”the Start-up Grant of Institute of Coal Chemistry for financial support。
文摘Photocatalytic mineralization of recalcitrant contaminants like phenol in wastewater requires abundant hydroxyl radicals(·OH) to initiate the reaction prior to the ring-opening. We here increase the free energy for adsorption of O~* species on TiOsurface and slightly downshift the band position by tin doping. This can simultaneously promote the generation and suppress the annihilation of ·OH. Besides, tin doping can also facilitate semiconductor-cocatalyst-solution(SCS) interfacial electron transfer by lowering the potential barrier and synergistically enhance the photon utilization. By filming the photocatalyst onto our developed fixed bed reactors, the loss of photons resulting from undesirable absorption by contaminants can be alleviated. By these virtues, trace amount of phenol in wastewater can be efficiently mineralized.
