采用水介质由巯基丙酸与顺丁烯二酸酐反应得到羧乙基硫代丁二酸(CETSA),并采用IR、1 HNMR及13 C NMR进行了结构表征。探讨了阴离子交换树脂、阳离子交换树脂及硫酸对反应的催化作用,结果表明三种催化剂催化效果相近。测定了CETSA钙螯合...采用水介质由巯基丙酸与顺丁烯二酸酐反应得到羧乙基硫代丁二酸(CETSA),并采用IR、1 HNMR及13 C NMR进行了结构表征。探讨了阴离子交换树脂、阳离子交换树脂及硫酸对反应的催化作用,结果表明三种催化剂催化效果相近。测定了CETSA钙螯合值为3119mg/g,阻垢性能及缓蚀性能测试表明,当CETSA质量浓度大于1.0×10-5时,阻垢率大于99%,CETSA对金属镁、锌有明显的缓蚀作用。展开更多
Cerium oxide nanoparticles coated by sodium bis(2-ethylexyl) sulphosuccinate(AOT) were prepared by using a microemulsion method.Transmission electron microscopy revealed an average particle siae of 2-3nm.X-ray diffrac...Cerium oxide nanoparticles coated by sodium bis(2-ethylexyl) sulphosuccinate(AOT) were prepared by using a microemulsion method.Transmission electron microscopy revealed an average particle siae of 2-3nm.X-ray diffraction showed that the cerium oxide nanoparticles retain the CeF2-type cubic structures like the bulk crystal.The intermediate valence offormally tetravalent compounds had been detected by x-ray-absorption near-edge structetravalent compounds had been detected by x-ray-absorption near-dege structure(XANES) spectra of Ce LIII absorption in bulk CeO2 and the cerium oxide nanoparticles.Two well resoved white lines can be assigned to the electron configurations of 4f^0L and 4f^1L,respectively,where L denotes a ligand hole.At the same time,the cerium oxide nanoparticles also showed the structural featres of trivalent compounds,in comparison to the trivalent Ce(NO3)3·6H2O.Fuor Lorentzian functions and two arctan functions were used to fit the normalized XANES spectra.The extended x-ray-absorption fine-structure(EXAFS) technique was used to probe the local atomic structures around the absorber Ce.The multielectrorn excitation effect on the EXAFS spectra was eliminated.A cor-shell model was used to deduce the near-neighbour structural parameters around cerium.Bulk CeO2 with eight oxygen atoms located at 2.343A was used as the reference sample to extract the backscattering amplitude and phase shift of the Ce-O bond.One half of the atome locate at the core part with the CeF2-type cubic structures(eight oxyens at 2.343A around Ce),the other half of the atoms are amorphous phase located in the shell part (surface of the nanoparticles) with approximately Ce2O3 structural features (averageed seven oxygens at 2.50A around Ce).展开更多
文摘采用水介质由巯基丙酸与顺丁烯二酸酐反应得到羧乙基硫代丁二酸(CETSA),并采用IR、1 HNMR及13 C NMR进行了结构表征。探讨了阴离子交换树脂、阳离子交换树脂及硫酸对反应的催化作用,结果表明三种催化剂催化效果相近。测定了CETSA钙螯合值为3119mg/g,阻垢性能及缓蚀性能测试表明,当CETSA质量浓度大于1.0×10-5时,阻垢率大于99%,CETSA对金属镁、锌有明显的缓蚀作用。
文摘Cerium oxide nanoparticles coated by sodium bis(2-ethylexyl) sulphosuccinate(AOT) were prepared by using a microemulsion method.Transmission electron microscopy revealed an average particle siae of 2-3nm.X-ray diffraction showed that the cerium oxide nanoparticles retain the CeF2-type cubic structures like the bulk crystal.The intermediate valence offormally tetravalent compounds had been detected by x-ray-absorption near-edge structetravalent compounds had been detected by x-ray-absorption near-dege structure(XANES) spectra of Ce LIII absorption in bulk CeO2 and the cerium oxide nanoparticles.Two well resoved white lines can be assigned to the electron configurations of 4f^0L and 4f^1L,respectively,where L denotes a ligand hole.At the same time,the cerium oxide nanoparticles also showed the structural featres of trivalent compounds,in comparison to the trivalent Ce(NO3)3·6H2O.Fuor Lorentzian functions and two arctan functions were used to fit the normalized XANES spectra.The extended x-ray-absorption fine-structure(EXAFS) technique was used to probe the local atomic structures around the absorber Ce.The multielectrorn excitation effect on the EXAFS spectra was eliminated.A cor-shell model was used to deduce the near-neighbour structural parameters around cerium.Bulk CeO2 with eight oxygen atoms located at 2.343A was used as the reference sample to extract the backscattering amplitude and phase shift of the Ce-O bond.One half of the atome locate at the core part with the CeF2-type cubic structures(eight oxyens at 2.343A around Ce),the other half of the atoms are amorphous phase located in the shell part (surface of the nanoparticles) with approximately Ce2O3 structural features (averageed seven oxygens at 2.50A around Ce).
