摘要
以改良的Hummers氧化法制备了氧化石墨烯(GO),并研究其对铜绿假单胞菌发酵液中鼠李糖脂(Rha)的吸附分离特性.结果表明,通过Hummers氧化法,可使石墨粉氧化为GO,并形成层数很少甚至单层的GO片,使所得GO的比表面积较石墨粉显著增大.以所得GO对铜绿假单胞菌NY3发酵液中的Rha进行吸附,发现当发酵液的pH值为4.0、吸附温度为25℃时,Rha在GO表面的吸附可迅速平衡,其最大吸附量约为1.7 g·g^-1.pH13的氢氧化钠溶液可使Rha一次洗脱回收率为86.1%,是较佳的洗脱剂.重复利用实验表明,且所得的GO吸附剂可重复利用.
Graphene oxide(GO)was prepared using the method of improved Hummers,and its adsorption and separation properties of rhamnolipid from the fermentation broth of P.aeruginosa were studied.The results showed that,graphene has been oxidize and peeled to fewer layers with obviously lager specific surface area after oxidized by Hummer method.The adsorption of rhamnolipid on the surface of GO reached equilibrium quickly and the maximum adsorption amounts got to be 1.7 g·g^-1 when pH and temperature of the fermentation broth was 4.0 and 25℃respectively.The once desorption rate of rhamnolipid reached 86.1%using sodium hydroxide solution with pH of 13 as optimum desorption reagent.Meanwhile,the adsorbents of GO could be used recycling.
作者
崔莹
聂麦茜
聂红云
第五振军
孙涵
CUI Ying;NIE Maiqian;NIE Hongyun;DIWU Zhenjun;SUN Han(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China;Key Laboratory of Membrane Separation of Shannxi Province,Xi'an,710055,China)
出处
《环境化学》
CAS
CSCD
北大核心
2019年第10期2294-2299,共6页
Environmental Chemistry
基金
中国博士后科学基金(2018M633479)
陕西省科技厅重点产业创新链项目(20192DLSF05-04)
陕西省教育厅科研计划项目(18JK0449)资助~~
关键词
鼠李糖脂
氧化石墨烯
吸附
脱附
rhamnolipid
graphene oxide
adsorption
desorption
