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槲皮素在石蜡-石墨粉末电极上的电化学行为 总被引:6,自引:0,他引:6
以含有0.5 mol·L-1KCl的Britton-Robinson缓冲溶液为底液,采用循环伏安法和恒电势氧化-负向电势扫描法在石蜡-石墨粉末电极上测试了槲皮素的伏安行为,得到4个氧化峰和至少2个还原峰,探讨了氧化还原峰之间的对应关系及氧化反应机理.微分脉冲伏安法检测表明:在2.0×10-8~ 4.0×10-6mol·L-1浓度范围内,槲皮素主氧化峰电流与浓度存在良好的线性关系,表明该电极可用于槲皮素的微量检测. 相似文献
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NaA zeolite membranes with 80 cm in length and 12.8 mm in outer diameter were prepared by our research group cooperating with Nanjing Jiusi Hi-Tech Co., China. The influence of dissolved inorganic salts and pH value in the feed of isopropanol (IPA) solution on NaA zeolite membranes was investigated. It was found that both factors exhibited strong influence on the stability of NaA zeolite membranes. A set of pretreatment steps such as pH adjustment and distillation of the IPA solution were proposed to improve stability for pervaporation dehydration. An industrial-scale pervaporation facility with 52 m2 membrane area was built to dehydrate IPA solution from industrial cephalosporin production. The facility was continuously operated at 368-378 K to dehydrate IPA solution from water mass content of 15%-20% to less than 2% with a feed flow rate of 400-500 L·h-1 and an average water flux of 1-1.5 kg·m-2·h-1. The successful application of this facility suggested a promising application of NaA zeolite mem-brane for IPA recovery from pharmaceutical production. 相似文献
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