烟叶提取物合成酵母菌载纳米铁

Synthesis of Yeast Supported Iron Nanoparticles Using Tobacco Leaf Extract

以酵母菌为载体和分散剂,烟叶提取液为还原剂和稳定剂,原位还原FeSO4合成酵母菌载纳米铁。以Cr(Ⅵ)去除为目标,考察提取溶剂、固液比、提取方式、提取时间以及烟叶提取液用量、亚铁盐与酵母菌质量比、合成反应时间对酵母菌载纳米铁去除Cr(Ⅵ)反应活性的影响。结果表明:固液比为1∶20(g∶mL)的烟叶乙醇提取液还原亚铁盐的能力最强,而室温振荡提取2 h与超声提取30 min的烟叶乙醇提取液还原性能相当;当亚铁盐与酵母菌质量比为1∶10时,加入烟叶乙醇提取液在室温下反应5 h合成的酵母菌载纳米铁最适于去除Cr(Ⅵ)。

Using tobacco leaf extract as reducing agent and capping agent,and yeast as acarrier and dispersing agent,we prepared yeast supported iron nanoparticles by in situ reduction of FeSO4.The influences of the tobacco leaf extraction conditions,regarding extraction solvent,leaf mass-solvent volume ratio,extraction time and extraction manner,on the Cr(Ⅵ)removal activity were investigated.The influences of the preparation conditions of iron nanoparticles,such as the tobacco leaf extract dosage,the mass ratio of ferrous salt to yeast and the synthesis time,on the Cr(Ⅵ)removal activity were also investigated.The results show that the ethanol extract obtained under the leaf mass-solvent volume ratio of 1∶20(g∶mL)is the most effective reductant for the reduction of ferrous sulfate in the tested tobacco leaf extracts,and the reducing power of the two hours shaking extraction is equivalent to that of 30 min ultrasonic extraction on the reduction of ferrous sulfate.The optimum iron nanoparticles for Cr(Ⅵ)removal is synthesized by the reduction of ferrous sulfate with ethanol extract of tobacco leaf for 5 h under the ferrous salt to yeast mass ratio of 1∶10.