Polyhedron lead hydroxide carbonate （2PbCO3·Pb（OH）2 ） microcrystals have been prepared in solution phase via a facile method in the presence of surfactant cetyltrimethylammonium bromide （CTAB）. All the samp...Polyhedron lead hydroxide carbonate （2PbCO3·Pb（OH）2 ） microcrystals have been prepared in solution phase via a facile method in the presence of surfactant cetyltrimethylammonium bromide （CTAB）. All the samples were characterized by powder X-ray diffraction ,pattern （XRD）, field-emission scanning electron mi- croscopy （FE-SEM）, high-resolution transmission electron microscopy （HRTEM）, and selected area electron diffraction （SAED）. The possible growth mechanism was discussed. 2PbCO3·Pb（OH）2 microcrystals were found to be a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） by transesterification of dimethyl carbonate （DMC） with phenol. Compared with some other catalysts, such as AlCl3, ZnCl2, and Mg5（CO3）4（OH）2, 2PbCO3·Pb（OH）2 microcrystals are stable and show relatively high activity at low catalyst amount. When the reaction was carried out at 180 12, with a molar ratio of phenol to DMC of 2：1, a reaction time 14 h, and a catalyst amount 0.2% （molar ratio to phenol）, the selectivity of DPC and methyl phenyl carbonate （MPC） was 14.7% and 78.8%, respectively.展开更多
We explored an interfacial synthesis of two-dimensional(2D)_(2)PbCO_(3)·Pb(OH)_(2) nanosheets with an average thickness of 3.3 nm at the gas/liquid interface.Their morphologies and structures were well characteri...We explored an interfacial synthesis of two-dimensional(2D)_(2)PbCO_(3)·Pb(OH)_(2) nanosheets with an average thickness of 3.3 nm at the gas/liquid interface.Their morphologies and structures were well characterized by TEM/SAED,SEM,AFM,and PXRD.The single crystal nanosheets are regular hexagons with the edge length ranging from 1 to 10μm.The as-prepared 2D nanosheets were further used as a catalyst for the oxidation reaction of tetramethylbenzidine(TMB).The experimental results revealed that the 2D nanosheets have an intrinsic enzyme mimetic activity similar to that of peroxidases,which are common in nature.The ultrathin 2D nanosheets prepared via an interfacial synthesis procedure exhibit catalytic activity superior to that of commercial 2PbCO_(3)·Pb(OH)_(2) powder.展开更多
基金Sponsored by the National Natural Science Foundation of China (20671011,20331010,90406002 and 90406024)"111"Project (B07012) Key Laboratory of Structural Chemistry Foundation,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences(060017)
文摘Polyhedron lead hydroxide carbonate （2PbCO3·Pb（OH）2 ） microcrystals have been prepared in solution phase via a facile method in the presence of surfactant cetyltrimethylammonium bromide （CTAB）. All the samples were characterized by powder X-ray diffraction ,pattern （XRD）, field-emission scanning electron mi- croscopy （FE-SEM）, high-resolution transmission electron microscopy （HRTEM）, and selected area electron diffraction （SAED）. The possible growth mechanism was discussed. 2PbCO3·Pb（OH）2 microcrystals were found to be a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） by transesterification of dimethyl carbonate （DMC） with phenol. Compared with some other catalysts, such as AlCl3, ZnCl2, and Mg5（CO3）4（OH）2, 2PbCO3·Pb（OH）2 microcrystals are stable and show relatively high activity at low catalyst amount. When the reaction was carried out at 180 12, with a molar ratio of phenol to DMC of 2：1, a reaction time 14 h, and a catalyst amount 0.2% （molar ratio to phenol）, the selectivity of DPC and methyl phenyl carbonate （MPC） was 14.7% and 78.8%, respectively.
基金supported by the National Natural Science Foundation of China(21604046)the National Young Thousand Talents Program,the Shandong Provincial Natural Science Foundation,China(ZR2016XJ004)the Open Foundation from the Academic Division of Chemistry,Qingdao University of Science and Technology(QUSTHX_(2)01907).
文摘We explored an interfacial synthesis of two-dimensional(2D)_(2)PbCO_(3)·Pb(OH)_(2) nanosheets with an average thickness of 3.3 nm at the gas/liquid interface.Their morphologies and structures were well characterized by TEM/SAED,SEM,AFM,and PXRD.The single crystal nanosheets are regular hexagons with the edge length ranging from 1 to 10μm.The as-prepared 2D nanosheets were further used as a catalyst for the oxidation reaction of tetramethylbenzidine(TMB).The experimental results revealed that the 2D nanosheets have an intrinsic enzyme mimetic activity similar to that of peroxidases,which are common in nature.The ultrathin 2D nanosheets prepared via an interfacial synthesis procedure exhibit catalytic activity superior to that of commercial 2PbCO_(3)·Pb(OH)_(2) powder.
