The development of a simple and facile synthesis route is a highly desirable but challenging process in the fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks(ZIFs).Herein we describe a facil...The development of a simple and facile synthesis route is a highly desirable but challenging process in the fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks(ZIFs).Herein we describe a facile method for rapidly synthesizing hierarchically porous ZIF-90 nanocrystals(particle sizes of~300 nm)using hydroxyl double salts as intermediates at room temperature.The as-synthesized ZIF-90 contained hierarchical porous structures developed using a crystalline interior and a random stack of multiple nanoparticles.Both the morphology and particle size of ZIF-90 nanocrystals could be tuned by controlling the molar ratio of ICA/Zn^(2+).Note that the as-synthesized hierarchically porous ZIF-90 nanocrystals exhibited higher thermal stability compared with the conventional ZIF-90.Because of the introduction of hierarchical porous structures,the resultant hierarchically porous ZIF-90 nanocrystals showed enhanced toluene adsorption capacity than those of conventional metal organic frameworks and zeolites.展开更多
MXenes are a family of two-dimensional(2D)transition metal carbides and nitrides with many intriguing properties and applications,many of which require surface modification.Herein,as-synthesized Ti_(3)C_(2) was modifi...MXenes are a family of two-dimensional(2D)transition metal carbides and nitrides with many intriguing properties and applications,many of which require surface modification.Herein,as-synthesized Ti_(3)C_(2) was modified using different treatments(acid and base treatments)and then characterized by a complementary combination of X-ray powder diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),nitrogen adsorption-desorption isotherms,and pore size distribution analysis.The results indicated that the structure and surface properties of the obtained Ti_(3)C_(2) could be tuned using various treatments.The modification methods developed in this study may offer a new direction for tuning the structure and surface properties of MXenes for a wide range of applications.展开更多
基金the National Natural Science Foundation of China(No.21576094)the Guangdong Natural Science Foundation(No.2017A030313052)the Guangdong Basic and Applied Basic Research Foundation(Nos.2019A1515110706,2019A1515110259 and 2019A1515110535)。
文摘The development of a simple and facile synthesis route is a highly desirable but challenging process in the fabrication of nanoscale hierarchical porous zeolitic imidazolate frameworks(ZIFs).Herein we describe a facile method for rapidly synthesizing hierarchically porous ZIF-90 nanocrystals(particle sizes of~300 nm)using hydroxyl double salts as intermediates at room temperature.The as-synthesized ZIF-90 contained hierarchical porous structures developed using a crystalline interior and a random stack of multiple nanoparticles.Both the morphology and particle size of ZIF-90 nanocrystals could be tuned by controlling the molar ratio of ICA/Zn^(2+).Note that the as-synthesized hierarchically porous ZIF-90 nanocrystals exhibited higher thermal stability compared with the conventional ZIF-90.Because of the introduction of hierarchical porous structures,the resultant hierarchically porous ZIF-90 nanocrystals showed enhanced toluene adsorption capacity than those of conventional metal organic frameworks and zeolites.
基金financially supported by Guangdong Provincial Key Lab of Green Chemical Product Technology(No.GC202111)Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110706)+5 种基金the National Natural Science Foundation of China(No.21576094)the Medical Science and Technology Research Foundation of Guangdong Province(No.A2021189)the Innovation Team of Universities in Guangdong Province(No.2020KCXTD011)the Engineering Research Center of Universities in Guangdong Province(No.2019GCZX002)Guangdong Key Laboratory for Hydrogen Energy Technologies(No.2018B030322005)College Students Innovative Entrepreneurship Training Program(No.S202111847101)。
文摘MXenes are a family of two-dimensional(2D)transition metal carbides and nitrides with many intriguing properties and applications,many of which require surface modification.Herein,as-synthesized Ti_(3)C_(2) was modified using different treatments(acid and base treatments)and then characterized by a complementary combination of X-ray powder diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),nitrogen adsorption-desorption isotherms,and pore size distribution analysis.The results indicated that the structure and surface properties of the obtained Ti_(3)C_(2) could be tuned using various treatments.The modification methods developed in this study may offer a new direction for tuning the structure and surface properties of MXenes for a wide range of applications.
