C_(3)N_(4),C_(3)N_(4)@Ti_(3)C_(2)and W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres were successfully prepared by using SiO_(2)template followed by gradual deposition method.The degradation of phenol solution and p...C_(3)N_(4),C_(3)N_(4)@Ti_(3)C_(2)and W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres were successfully prepared by using SiO_(2)template followed by gradual deposition method.The degradation of phenol solution and photolysis ability were tested to characterize its photocatalytic activity.Compared with the single-shelled C_(3)N_(4)and C_(3)N_(4)@Ti_(3)C_(2)hollow spheres,double-shelled W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres possessed larger surface area and fast charge separation efficiency,exhibiting about 8.9 times and 4.0 times higher H_(2)evolution than those of C_(3)N_(4),C_(3)N_(4)@Ti_(3)C_(2)hollow spheres,respectively.The photocatalytic mechanism of the W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres were carefully investigated according to the results of morphology design and photoelectric performance.A Z scheme mechanism based on the construction of heterojunctions was proposed to explain the improvement of photocatalytic performance.This new charge transfer mechanism appears to greatly inhibit the recombination of electrons/holes during the charge transfer process,while maintaining its strong hydrogen reduction ability,resulting in a higher photocatalytic performance.展开更多
建立了超高效液相色谱-串联质谱检测枳实药材中辛弗林、N-甲基酪胺的方法。以甲醇为提取溶剂,经QuECHERS分散净化,采用资生堂CAPCELL PAK CR色谱柱(150mm×2.0mm,5μm;C_(18)和SCX比例为1∶4)分离,质谱以正离子扫描,反应监测模式测...建立了超高效液相色谱-串联质谱检测枳实药材中辛弗林、N-甲基酪胺的方法。以甲醇为提取溶剂,经QuECHERS分散净化,采用资生堂CAPCELL PAK CR色谱柱(150mm×2.0mm,5μm;C_(18)和SCX比例为1∶4)分离,质谱以正离子扫描,反应监测模式测定。辛弗林和N-甲基酪胺在10~2000ng/mL范围内线性关系良好(R^(2)>0.997),检出限和定量限分别为0.3ng/mL和1.0ng/mL,回收率范围为94.3%~105.7%,相对标准偏差(RSD)均小于3%。该方法避免了使用磷酸盐和离子对试剂,仅在流动相中添加甲酸和甲酸铵,分析物就能有较好的保留,具有极高的质谱响应。相较于传统方法,该方法分析时间短、操作简单、专属性强,在强极性生物碱分离检测方面具有较好的应用价值。展开更多
基金Supported by the National Natural Science Foundation of China(Nos.91963207 and 12075174)。
文摘C_(3)N_(4),C_(3)N_(4)@Ti_(3)C_(2)and W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres were successfully prepared by using SiO_(2)template followed by gradual deposition method.The degradation of phenol solution and photolysis ability were tested to characterize its photocatalytic activity.Compared with the single-shelled C_(3)N_(4)and C_(3)N_(4)@Ti_(3)C_(2)hollow spheres,double-shelled W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres possessed larger surface area and fast charge separation efficiency,exhibiting about 8.9 times and 4.0 times higher H_(2)evolution than those of C_(3)N_(4),C_(3)N_(4)@Ti_(3)C_(2)hollow spheres,respectively.The photocatalytic mechanism of the W_(18)O_(49)@C_(3)N_(4)@Ti_(3)C_(2)hollow spheres were carefully investigated according to the results of morphology design and photoelectric performance.A Z scheme mechanism based on the construction of heterojunctions was proposed to explain the improvement of photocatalytic performance.This new charge transfer mechanism appears to greatly inhibit the recombination of electrons/holes during the charge transfer process,while maintaining its strong hydrogen reduction ability,resulting in a higher photocatalytic performance.
文摘建立了超高效液相色谱-串联质谱检测枳实药材中辛弗林、N-甲基酪胺的方法。以甲醇为提取溶剂,经QuECHERS分散净化,采用资生堂CAPCELL PAK CR色谱柱(150mm×2.0mm,5μm;C_(18)和SCX比例为1∶4)分离,质谱以正离子扫描,反应监测模式测定。辛弗林和N-甲基酪胺在10~2000ng/mL范围内线性关系良好(R^(2)>0.997),检出限和定量限分别为0.3ng/mL和1.0ng/mL,回收率范围为94.3%~105.7%,相对标准偏差(RSD)均小于3%。该方法避免了使用磷酸盐和离子对试剂,仅在流动相中添加甲酸和甲酸铵,分析物就能有较好的保留,具有极高的质谱响应。相较于传统方法,该方法分析时间短、操作简单、专属性强,在强极性生物碱分离检测方面具有较好的应用价值。
