Environmental pollution and energy deficiency represent major problems for the sustainability of the modern world. Photocatalysis has recently emerged as an effective and environmentally friendly technique to address ...Environmental pollution and energy deficiency represent major problems for the sustainability of the modern world. Photocatalysis has recently emerged as an effective and environmentally friendly technique to address some of these sustainability issues,although the key to the success of this approach is dependent on the photocatalysts themselves. Based on their attractive physic chemical properties,including their ultrahigh surface areas,homogeneous active sites and tunable functionality,metal-organic frameworks（MOFs） have become interesting platforms for the development of solar energy conversion devices. Furthermore,MOFs have recently been used in a wide variety of applications,including heterogeneous photocatalysis for pollutant degradation,organic transformations,hydrogen production and CO2 reduction. In this review,we have highlighted recent progress towards the application of MOFs in all of these areas. We have collected numerous reported examples of the use of MOFs in these areas,as well as providing some analysis of the key factors influencing the efficiency of these systems. Moreover,we have provided a detailed discussion of new strategies that have been developed for enhancing the photocatalytic activity of MOFs. Finally,we have provided an outlook for this area in terms of the future challenges and potential prospects for MOFs in photocatalysis.展开更多
The metal complex 5-（4-aminophenyl）-10,15,20-triphenylporphyrin copper （CuAPTPP） was covalently linked on the surface of TiO2 microspheres by using toluene disocyanate （TDI） as a bridging bond unit. The hydroxyl...The metal complex 5-（4-aminophenyl）-10,15,20-triphenylporphyrin copper （CuAPTPP） was covalently linked on the surface of TiO2 microspheres by using toluene disocyanate （TDI） as a bridging bond unit. The hydroxyl group （-OH） of TiO2 microspheres surface and the amino group （-NH2） of CuAPTPP reacted respectively with the active -NCO groups of TDI to form a surface conjugated microsphere CuAPTPP-TDI-TiO2 that was confirmed by FT-IR spectra. The CuAPTPP-TDI-TiO2 microspheres were characterized with UV-visible, elemental analysis, XRD, SEM, and UV-Vis diffuse reflectance spectra. The effect of amounts of linked TDI on the performance of photocatalytic microspheres was discussed, and the optimal molar ratio of TDI：TiO2 was established. The photocatalytic activity of CuAPTPP- TDI-TiO2 was evaluated using the photocatalytic degradation of methylene blue （MB） under visible-light irradiation. The results showed that, TDI, as a bond unit, was used to form a steady chemical brigdging bond linking CuAPTPP and the surface of TiO2 microspheres, and the prepared catalyst exhibited higher photocatalytic activity under visible-light irradiation for MB degradation. The degradation rate of 20 mg/L MB could reach 98.7% under Xe- lamp （150 W） irradiation in 120 rain. The degradation of MB followed the first-order reaction model under visible light irradiation, and the rate constant of 5.1× 10^-2 min-1 and the half- life of 11.3 min were achieved. And the new photocatalyst can be recycled for 4 times, remaining 90.0% MB degradation rate.展开更多
基金supported by the National Natural Science Foundation of China(2127303621177024)+1 种基金the National Basic Research Program of China(973 Program2014CB239303)~~
文摘Environmental pollution and energy deficiency represent major problems for the sustainability of the modern world. Photocatalysis has recently emerged as an effective and environmentally friendly technique to address some of these sustainability issues,although the key to the success of this approach is dependent on the photocatalysts themselves. Based on their attractive physic chemical properties,including their ultrahigh surface areas,homogeneous active sites and tunable functionality,metal-organic frameworks（MOFs） have become interesting platforms for the development of solar energy conversion devices. Furthermore,MOFs have recently been used in a wide variety of applications,including heterogeneous photocatalysis for pollutant degradation,organic transformations,hydrogen production and CO2 reduction. In this review,we have highlighted recent progress towards the application of MOFs in all of these areas. We have collected numerous reported examples of the use of MOFs in these areas,as well as providing some analysis of the key factors influencing the efficiency of these systems. Moreover,we have provided a detailed discussion of new strategies that have been developed for enhancing the photocatalytic activity of MOFs. Finally,we have provided an outlook for this area in terms of the future challenges and potential prospects for MOFs in photocatalysis.
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.21276208）, the Doctor Fundation of Education Ministry of China （No.20096118110008）, the Special Research Fund of Shaanxi Provincial Department of Education of China （No.12JK0606）, and the Research Fund for Excellent Doctoral Thesis of Xi＇an University of Technology （No.207-002J1304）.
文摘The metal complex 5-（4-aminophenyl）-10,15,20-triphenylporphyrin copper （CuAPTPP） was covalently linked on the surface of TiO2 microspheres by using toluene disocyanate （TDI） as a bridging bond unit. The hydroxyl group （-OH） of TiO2 microspheres surface and the amino group （-NH2） of CuAPTPP reacted respectively with the active -NCO groups of TDI to form a surface conjugated microsphere CuAPTPP-TDI-TiO2 that was confirmed by FT-IR spectra. The CuAPTPP-TDI-TiO2 microspheres were characterized with UV-visible, elemental analysis, XRD, SEM, and UV-Vis diffuse reflectance spectra. The effect of amounts of linked TDI on the performance of photocatalytic microspheres was discussed, and the optimal molar ratio of TDI：TiO2 was established. The photocatalytic activity of CuAPTPP- TDI-TiO2 was evaluated using the photocatalytic degradation of methylene blue （MB） under visible-light irradiation. The results showed that, TDI, as a bond unit, was used to form a steady chemical brigdging bond linking CuAPTPP and the surface of TiO2 microspheres, and the prepared catalyst exhibited higher photocatalytic activity under visible-light irradiation for MB degradation. The degradation rate of 20 mg/L MB could reach 98.7% under Xe- lamp （150 W） irradiation in 120 rain. The degradation of MB followed the first-order reaction model under visible light irradiation, and the rate constant of 5.1× 10^-2 min-1 and the half- life of 11.3 min were achieved. And the new photocatalyst can be recycled for 4 times, remaining 90.0% MB degradation rate.
