In this paper,the formation mechanism of mesoporous CeO_(2) synthesized by thermal decomposition of Ce-MOF and its performance of benzene catalytic combustion,as well as the structure-activity relationship between the...In this paper,the formation mechanism of mesoporous CeO_(2) synthesized by thermal decomposition of Ce-MOF and its performance of benzene catalytic combustion,as well as the structure-activity relationship between them were studied in depth.The self-assembly process and physicochemical properties of CeO_(2) were characterized by thermogravimetry analysis,powder X-ray diffraction,N2 adsorption/desorption,high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy techniques.Characterization results show that Ce-MOF is completely decomposed into pure mesoporous CeO_(2) when the decomposition temperature is higher than 400℃.At this threshold temperature,CeO_(2)(400) has the largest specific surface area and pore volume of 114 m^(2)/g and 0.152 cm^(3)/g,respectively.CeO_(2)(400) exhibits very high catalytic activity for benzene combustion,which can completely catalyze the degradation of benzene at 260℃.Meanwhile,the mesoporous CeO_(2)(400) supported Pt nanocrystalline catalysts were prepared by high temperature solution-phase reduction method.Pt/CeO_(2)(400)can completely degrade benzene at about 200℃ and represents high durability and good waterresistance for benzene combustion during 100 h of continuous reaction.展开更多
Phosphate plays a critical role in maintaining homeostasis and engaging in cellular metabolism and energy transduction within the human body.Dysregulation of phosphate concentration can lead to various disorders.Howev...Phosphate plays a critical role in maintaining homeostasis and engaging in cellular metabolism and energy transduction within the human body.Dysregulation of phosphate concentration can lead to various disorders.However,current detection methods face significant challenges,including low sensitivity,narrow linear ranges,and extended response times.To address these issues,we employ a ligand-regulation strategy and adopt a bottom-up approach to synthesize a series of Ce-based metal organic frameworks(MOFs)with diff erent substituents(–NO_(2),–OH,–NH_(2)).These materials demonstrate outstanding performance in phosphate ion detection using the fluorescence analytical method.Notably,they exhibit a broad linear range(0–250μmol/L),low detection limit(1.8×10^(–9)mol/L),and rapid response time(4 min).Furthermore,hydroxyl and amino-functionalized Ce-MOFs exhibit successful application in intracellular fluorescence imaging.This capability is significant for detecting phosphate in biological systems and holds promise for contributing to diagnosing and treating diseases.展开更多
基金Project supported by Zhejiang Public Welfare Technology Research Project(LGG19B070003)the Foundation of Science and Technology of the Shaoxing City(2018C10019)the National Natural Science Foundation of China(21577094)。
文摘In this paper,the formation mechanism of mesoporous CeO_(2) synthesized by thermal decomposition of Ce-MOF and its performance of benzene catalytic combustion,as well as the structure-activity relationship between them were studied in depth.The self-assembly process and physicochemical properties of CeO_(2) were characterized by thermogravimetry analysis,powder X-ray diffraction,N2 adsorption/desorption,high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy techniques.Characterization results show that Ce-MOF is completely decomposed into pure mesoporous CeO_(2) when the decomposition temperature is higher than 400℃.At this threshold temperature,CeO_(2)(400) has the largest specific surface area and pore volume of 114 m^(2)/g and 0.152 cm^(3)/g,respectively.CeO_(2)(400) exhibits very high catalytic activity for benzene combustion,which can completely catalyze the degradation of benzene at 260℃.Meanwhile,the mesoporous CeO_(2)(400) supported Pt nanocrystalline catalysts were prepared by high temperature solution-phase reduction method.Pt/CeO_(2)(400)can completely degrade benzene at about 200℃ and represents high durability and good waterresistance for benzene combustion during 100 h of continuous reaction.
基金financially supported by the National Natural Science Foundation of China(22074095 and 22374103)Beijing Municipal Natural Science Foundation(2222005)。
文摘Phosphate plays a critical role in maintaining homeostasis and engaging in cellular metabolism and energy transduction within the human body.Dysregulation of phosphate concentration can lead to various disorders.However,current detection methods face significant challenges,including low sensitivity,narrow linear ranges,and extended response times.To address these issues,we employ a ligand-regulation strategy and adopt a bottom-up approach to synthesize a series of Ce-based metal organic frameworks(MOFs)with diff erent substituents(–NO_(2),–OH,–NH_(2)).These materials demonstrate outstanding performance in phosphate ion detection using the fluorescence analytical method.Notably,they exhibit a broad linear range(0–250μmol/L),low detection limit(1.8×10^(–9)mol/L),and rapid response time(4 min).Furthermore,hydroxyl and amino-functionalized Ce-MOFs exhibit successful application in intracellular fluorescence imaging.This capability is significant for detecting phosphate in biological systems and holds promise for contributing to diagnosing and treating diseases.
