Various zirconia stationary phases were prepared by modification with di-dentate Lewis bases: dodecyl-N,N-diacetic acid（RNCC）, dodecyl-N-acetic acid-N-methyleneposphonic acid（RNCP）, dodecyl-N,N-dimethylenephosphon...Various zirconia stationary phases were prepared by modification with di-dentate Lewis bases: dodecyl-N,N-diacetic acid（RNCC）, dodecyl-N-acetic acid-N-methyleneposphonic acid（RNCP）, dodecyl-N,N-dimethylenephosphonic acid（RNPP） and dodecencylsuccinic acid（RCC）. The color reaction of RNPP-ZrO2 and RNCP-ZrO2 with ammonium molybdate indicate there are free phosphonic groups on the surface of the stationary phases, and the FTIR spectra of RNCC-ZrO2 and RNCC-ZrO2 indicate there are free carboxyl groups. The RCC-ZrO2 is far more stable than RNCC-ZrO2 under alkali station. The results of color reaction, FTIR spectra and the stability test of stationary phases suggest that, due to the chelating effect, RNCC, RNCP and RNPP adsorb on zirconia with only one carboxyl or phosphonic group, however, RCC adsorb on zirconia with two carboxyl groups.展开更多
研究利用超声波辅助提取荷叶中多酚类化合物的最佳条件,考察了超声作用时间、提取次数、料液比和乙醇体积分数等因素对荷叶多酚提取率的影响,并在单因素实验的基础上进行正交实验,确定其优化工艺条件为:乙醇体积分数60%,作用时间15 m in...研究利用超声波辅助提取荷叶中多酚类化合物的最佳条件,考察了超声作用时间、提取次数、料液比和乙醇体积分数等因素对荷叶多酚提取率的影响,并在单因素实验的基础上进行正交实验,确定其优化工艺条件为:乙醇体积分数60%,作用时间15 m in,料液比为1:14,提取次数为4次。展开更多
A new photosensitive charge transfer complex has been synthesized based on phosphomolybdic acid and α-phridylazo-β-naphthol and characterized by elemental analysis, IR spectrum, UV spectrum, The resalts of IR spectr...A new photosensitive charge transfer complex has been synthesized based on phosphomolybdic acid and α-phridylazo-β-naphthol and characterized by elemental analysis, IR spectrum, UV spectrum, The resalts of IR spectra showed that the coordinating atom of α-phridylazo- β-naphthol was oxygen of C-O bond. The organic ligands do not coordinat5e with heteropolyanions, but with Protons in heteropoly acid by coordination bond. Photochromism studies show that the electron transfer takes place from the organic molecules to the heteropolyanions.展开更多
文摘Various zirconia stationary phases were prepared by modification with di-dentate Lewis bases: dodecyl-N,N-diacetic acid（RNCC）, dodecyl-N-acetic acid-N-methyleneposphonic acid（RNCP）, dodecyl-N,N-dimethylenephosphonic acid（RNPP） and dodecencylsuccinic acid（RCC）. The color reaction of RNPP-ZrO2 and RNCP-ZrO2 with ammonium molybdate indicate there are free phosphonic groups on the surface of the stationary phases, and the FTIR spectra of RNCC-ZrO2 and RNCC-ZrO2 indicate there are free carboxyl groups. The RCC-ZrO2 is far more stable than RNCC-ZrO2 under alkali station. The results of color reaction, FTIR spectra and the stability test of stationary phases suggest that, due to the chelating effect, RNCC, RNCP and RNPP adsorb on zirconia with only one carboxyl or phosphonic group, however, RCC adsorb on zirconia with two carboxyl groups.
文摘A new photosensitive charge transfer complex has been synthesized based on phosphomolybdic acid and α-phridylazo-β-naphthol and characterized by elemental analysis, IR spectrum, UV spectrum, The resalts of IR spectra showed that the coordinating atom of α-phridylazo- β-naphthol was oxygen of C-O bond. The organic ligands do not coordinat5e with heteropolyanions, but with Protons in heteropoly acid by coordination bond. Photochromism studies show that the electron transfer takes place from the organic molecules to the heteropolyanions.
