Dendritic mesoporous silica nanoparticles own three-dimensional center-radial channels and hierarchical pores,which endows themselves with super-high specific surface area,extremely large pore volumes,especially acces...Dendritic mesoporous silica nanoparticles own three-dimensional center-radial channels and hierarchical pores,which endows themselves with super-high specific surface area,extremely large pore volumes,especially accessible internal spaces,and so forth.Dissimilar guest species(such as organic groups or metal nanoparticles)could be readily decorated onto the interfaces of the channels and pores,realizing the functionalization of dendritic mesoporous silica nanoparticles for targeted applications.As adsorbents and catalysts,dendritic mesoporous silica nanoparticles-based materials have experienced nonignorable development in CO_(2)capture and catalytic conversion.This comprehensive review provides a critical survey on this pregnant subject,summarizing the designed construction of novel dendritic mesoporous silica nanoparticles-based materials,the involved chemical reactions(such as CO_(2)methanation,dry reforming of CH_(4)),the value-added chemicals from CO_(2)(such as cyclic carbonates,2-oxazolidinones,quinazoline-2,4(1H,3H)-diones),and so on.The adsorptive and catalytic performances have been compared with traditional silica mesoporous materials(such as SBA-15 or MCM-41),and the corresponding reaction mechanisms have been thoroughly revealed.It is sincerely expected that the in-depth discussion could give materials scientists certain inspiration to design brand-new dendritic mesoporous silica nanoparticles-based materials with superior capabilities towards CO_(2)capture,utilization,and storage.展开更多
Mesoporous CeO2 with high specific surface area was synthesized using a modified evaporation-induced self-assembly （EISA） method, and a series of different amounts of Ag were loaded to this mesoporous CeO2 by a modi...Mesoporous CeO2 with high specific surface area was synthesized using a modified evaporation-induced self-assembly （EISA） method, and a series of different amounts of Ag were loaded to this mesoporous CeO2 by a modified ethylene glycol reduction route. The samples were characterized by powder X-ray diffraction （XRD）, transmission electron microscopy （TEM）, energy-dispersive spectrometry （EDS）, nitrogen adsorption-desorption, Brunauer-Emmett-Teller （BET） and Barrett-Joyner- Halenda （BJH） methods. The mesoporous CeO2 structure with different proportions of silver nanoparticles and its antibacterial activity were adequately studied, confinnin~ that obtained novel materials show a good antibacterial effect.展开更多
KIT‐6 mesoporous silica aged at 40,100,and 150°C were used as hard templates to prepare different mesoporous MnO2 catalysts,marked as Mn‐40,Mn‐100,and Mn‐150,respectively.The catalytic activities of these cat...KIT‐6 mesoporous silica aged at 40,100,and 150°C were used as hard templates to prepare different mesoporous MnO2 catalysts,marked as Mn‐40,Mn‐100,and Mn‐150,respectively.The catalytic activities of these catalysts and the effect of pore sizes on ethanol catalytic oxidation were investigated.Mn‐40,Mn‐100,and Mn‐150 have triple,double,and single pore systems,respectively.On decreasing the aging temperature of KIT‐6,the pore sizes of KIT‐6 decrease and that of mesoporous MnO2 catalysts increase.The pore sizes and catalytic activities increase in the order:Mn‐40>Mn‐100>Mn‐150.Mn‐40 catalyst has a higher TOF(0.11 s–1 at 120°C)and the best catalytic activity for ethanol oxidation because of a bigger pore size with three pore systems with maximum distribution at 1.9,3.4,and 6.6 nm,decrease in symmetry and degree of order,more surface lattice oxygen species,oxygen vacancies resulting from more Mn3+ions,and better low‐temperature reducibility.展开更多
The ordered bimodal mesoporous silica MCM-48 spheres were facile synthesized by mild- temperature post-synthesis H2O2 hydrothermal treatment of as-synthesized MCM-48. The results showed that H2O2 is indispensable for ...The ordered bimodal mesoporous silica MCM-48 spheres were facile synthesized by mild- temperature post-synthesis H2O2 hydrothermal treatment of as-synthesized MCM-48. The results showed that H2O2 is indispensable for simultaneously removing organic templates and forming ordered bimodal mesoporous silica MCM-48 spheres. The bimodal mesoporous MCM-48 was characterized by X-ray diffraction, transmission electron micrographs, FT-IR, and N2 adsorption-desorption, and a possible mechanism was proposed for the formation of bimodal mesoporous MCM-48.展开更多
基金supported by the National Key R&D program of China(2019YFA0706802)National Natural Science Foundation of China(52063029)+2 种基金Natural Science Basic Research Program of Shaanxi(2022JM-200,2021JQ-716)China Postdoctoral Science Foundation(2020M672269)Doctoral Research Program of Yan’an University(YDBK2019-02)
文摘Dendritic mesoporous silica nanoparticles own three-dimensional center-radial channels and hierarchical pores,which endows themselves with super-high specific surface area,extremely large pore volumes,especially accessible internal spaces,and so forth.Dissimilar guest species(such as organic groups or metal nanoparticles)could be readily decorated onto the interfaces of the channels and pores,realizing the functionalization of dendritic mesoporous silica nanoparticles for targeted applications.As adsorbents and catalysts,dendritic mesoporous silica nanoparticles-based materials have experienced nonignorable development in CO_(2)capture and catalytic conversion.This comprehensive review provides a critical survey on this pregnant subject,summarizing the designed construction of novel dendritic mesoporous silica nanoparticles-based materials,the involved chemical reactions(such as CO_(2)methanation,dry reforming of CH_(4)),the value-added chemicals from CO_(2)(such as cyclic carbonates,2-oxazolidinones,quinazoline-2,4(1H,3H)-diones),and so on.The adsorptive and catalytic performances have been compared with traditional silica mesoporous materials(such as SBA-15 or MCM-41),and the corresponding reaction mechanisms have been thoroughly revealed.It is sincerely expected that the in-depth discussion could give materials scientists certain inspiration to design brand-new dendritic mesoporous silica nanoparticles-based materials with superior capabilities towards CO_(2)capture,utilization,and storage.
基金Projects (21071107, 51002016) supported by the National Natural Science Foundation of ChinaProject (JQ201003) supported by Changzhou University Fund for Young Talent,China
文摘Mesoporous CeO2 with high specific surface area was synthesized using a modified evaporation-induced self-assembly （EISA） method, and a series of different amounts of Ag were loaded to this mesoporous CeO2 by a modified ethylene glycol reduction route. The samples were characterized by powder X-ray diffraction （XRD）, transmission electron microscopy （TEM）, energy-dispersive spectrometry （EDS）, nitrogen adsorption-desorption, Brunauer-Emmett-Teller （BET） and Barrett-Joyner- Halenda （BJH） methods. The mesoporous CeO2 structure with different proportions of silver nanoparticles and its antibacterial activity were adequately studied, confinnin~ that obtained novel materials show a good antibacterial effect.
基金supported by the National Key Research and Development Program Foundation of China(2016YFC0209203)the National Natural Science Foundation of China(21707130,21325731)~~
文摘KIT‐6 mesoporous silica aged at 40,100,and 150°C were used as hard templates to prepare different mesoporous MnO2 catalysts,marked as Mn‐40,Mn‐100,and Mn‐150,respectively.The catalytic activities of these catalysts and the effect of pore sizes on ethanol catalytic oxidation were investigated.Mn‐40,Mn‐100,and Mn‐150 have triple,double,and single pore systems,respectively.On decreasing the aging temperature of KIT‐6,the pore sizes of KIT‐6 decrease and that of mesoporous MnO2 catalysts increase.The pore sizes and catalytic activities increase in the order:Mn‐40>Mn‐100>Mn‐150.Mn‐40 catalyst has a higher TOF(0.11 s–1 at 120°C)and the best catalytic activity for ethanol oxidation because of a bigger pore size with three pore systems with maximum distribution at 1.9,3.4,and 6.6 nm,decrease in symmetry and degree of order,more surface lattice oxygen species,oxygen vacancies resulting from more Mn3+ions,and better low‐temperature reducibility.
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.20872135） and the China National Tobacco Corporation （No.110200701007）.
文摘The ordered bimodal mesoporous silica MCM-48 spheres were facile synthesized by mild- temperature post-synthesis H2O2 hydrothermal treatment of as-synthesized MCM-48. The results showed that H2O2 is indispensable for simultaneously removing organic templates and forming ordered bimodal mesoporous silica MCM-48 spheres. The bimodal mesoporous MCM-48 was characterized by X-ray diffraction, transmission electron micrographs, FT-IR, and N2 adsorption-desorption, and a possible mechanism was proposed for the formation of bimodal mesoporous MCM-48.
