Doping and increasing specific surface area by forming highly porous structures are two effective ways to enhance the photocatalytic performances of TiO_(2) particles.He re for the first time,we report a new facile me...Doping and increasing specific surface area by forming highly porous structures are two effective ways to enhance the photocatalytic performances of TiO_(2) particles.He re for the first time,we report a new facile method to prepare the macroporous-mesoporous C-,S-,N-doped TiO_(2)(C/S/N-TiO_(2))microspheres via polyHIPE microsphe res as templates.The chemical and crystalline structure s of these hierarchical porous TiO_(2) microspheres are analyzed with FTIR,XPS,EDS,and XRD.The macroporous-mesoporous structures are confirmed with SEM observation and BET analysis.UV-vis DRS spectra analysis shows that the band gaps of C doped TiO_(2),C/N doped TiO_(2),C/S doped TiO_(2) and C/S/N doped TiO_(2) are estimated to be 3.07,3.01,2.94 and 2.81 eV,respectively,which are significantly narrower than that of TiO_(2) nanoparticles(3.23 eV).Photoluminescence spectra demonstrate that the recombination of electrons and holes in these macroporous-mesoporous TiO_(2) microspheres is also suppressed.The hierarchical porous C/S/N-TiO_(2) microspheres show high visible-light catalytic efficiency and excellent cycling stability to degrade RhB dye.展开更多
Metal-organic frameworks(MOFs)draw more and more attentions due to their abundant properties and potential applications in materials science.Developing new MOFs structures often gets unexpected material properties.Her...Metal-organic frameworks(MOFs)draw more and more attentions due to their abundant properties and potential applications in materials science.Developing new MOFs structures often gets unexpected material properties.Herein,we report the properties of a copper[2,2]paracyclophane dicarboxylate MOF(CuCP-MOF).The magnetic properties of both CuCP-MOF and activated CuCP-MOF are investigated.CuCP-MOF shows the triplet state electron paramagnetic resonance spectrum at room temperature due to the antiferromagnetic coupling of the copper(II)paddlewheel(Cu-PW)dimer centers.The MOF has strong intramolecular antiferromagnetic interactions(inside the paddle-wheel dimer centers)and very weak intermolecular interactions,while activated CuCP-MOF exhibits strong intramolecular and intermolecular interactions due to the existence of unpaired Cu(II)centers.We also investigate the electronic structure and semiconductor behavior of CuCP-MOF.The MOF is assigned to direct bandgap semiconductors.Moreover,CuCP-MOF could selectively adsorb cationic organic dyes.By utilizing the synergistic effects on adsorption and photodegradation,we successfully apply CuCP-MOF to organic dye removal.展开更多
基金the National Natural Science Foundation of China(No.51373160)for financial support。
文摘Doping and increasing specific surface area by forming highly porous structures are two effective ways to enhance the photocatalytic performances of TiO_(2) particles.He re for the first time,we report a new facile method to prepare the macroporous-mesoporous C-,S-,N-doped TiO_(2)(C/S/N-TiO_(2))microspheres via polyHIPE microsphe res as templates.The chemical and crystalline structure s of these hierarchical porous TiO_(2) microspheres are analyzed with FTIR,XPS,EDS,and XRD.The macroporous-mesoporous structures are confirmed with SEM observation and BET analysis.UV-vis DRS spectra analysis shows that the band gaps of C doped TiO_(2),C/N doped TiO_(2),C/S doped TiO_(2) and C/S/N doped TiO_(2) are estimated to be 3.07,3.01,2.94 and 2.81 eV,respectively,which are significantly narrower than that of TiO_(2) nanoparticles(3.23 eV).Photoluminescence spectra demonstrate that the recombination of electrons and holes in these macroporous-mesoporous TiO_(2) microspheres is also suppressed.The hierarchical porous C/S/N-TiO_(2) microspheres show high visible-light catalytic efficiency and excellent cycling stability to degrade RhB dye.
基金supported by the National Natural Science Foundation of China(No.21871243 and No.51673181).
文摘Metal-organic frameworks(MOFs)draw more and more attentions due to their abundant properties and potential applications in materials science.Developing new MOFs structures often gets unexpected material properties.Herein,we report the properties of a copper[2,2]paracyclophane dicarboxylate MOF(CuCP-MOF).The magnetic properties of both CuCP-MOF and activated CuCP-MOF are investigated.CuCP-MOF shows the triplet state electron paramagnetic resonance spectrum at room temperature due to the antiferromagnetic coupling of the copper(II)paddlewheel(Cu-PW)dimer centers.The MOF has strong intramolecular antiferromagnetic interactions(inside the paddle-wheel dimer centers)and very weak intermolecular interactions,while activated CuCP-MOF exhibits strong intramolecular and intermolecular interactions due to the existence of unpaired Cu(II)centers.We also investigate the electronic structure and semiconductor behavior of CuCP-MOF.The MOF is assigned to direct bandgap semiconductors.Moreover,CuCP-MOF could selectively adsorb cationic organic dyes.By utilizing the synergistic effects on adsorption and photodegradation,we successfully apply CuCP-MOF to organic dye removal.
