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›› 2002, Vol. 2 ›› Issue (4): 0-0.

• 4 •    

纳米Fe3O4颗粒的表面包覆及其在磁性氧化铝载体制备中的应用

张冠东，官月平，单国彬，安振涛，刘会洲   

  1. 中国科学院过程工程研究所分离科学与工程实验室及生化工程国家重点实验室，北京 100080
  • 出版日期:2002-08-20 发布日期:2002-08-20

Effect of Cultivation Conditions on the Growth of Thiobacillus Ferrooxidans and Ferrous Iron Oxidation in an Airlift Reactor

LUO Lin, KANG Rui-juan, MA Xiao-nan, CAI Zhao-ling   

  1. State Key Lab. Biochem. Eng., Inst. Chem. Metall., Chinese Academy of Sciences, Beijing 100080, China
  • Online:2002-08-20 Published:2002-08-20

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被引次数

216

摘要： 通过对共沉淀得到的Fe3O4磁性纳米颗粒在硅酸钠溶液中进行酸化处理，获得了表面包覆SiO2层的Fe3O4磁性组份. 由于SiO2的位阻作用，限制了Fe3O4微晶的团聚与继续生长，使Fe3O4核心分散在产物中保持较小的晶粒尺寸，包覆产物表现出超顺磁性，同时提高了磁性组份的耐候性. 将上述磁性组份加入到氢氧化铝溶胶中，采用内凝胶法(油中成型法)制备出磁性球形氧化铝载体，磁性组份外表的SiO2包覆层的隔离作用防止了磁性核心与载体组份之间发生的反应，也避免了铁组份可能对后续负载的催化剂活性组份造成的不良影响. 制备的磁性氧化铝载体具备超顺磁性，磁性氧化铝载体的磁性能因内部磁性核心组份的改变而发生一定变化.

关键词: Fe3O4, 纳米颗粒, 包覆, 磁性载体, 催化剂

Abstract: Based on the growth characteristics of Thiobacillus ferrooxidans in bioleaching systems, an airlift reactor was constructed to cultivate the bacteria. Leathen medium and 9K medium under different conditions were used to study the growth of Thiobacillus ferrooxidans, Fe2+ oxidation rate, dissolved oxygen and their relationship in the airlift reactor. The influence of cultivation conditions on the growth of the bacteria was investigated by monitoring dissolved oxygen and Fe2+ oxidation rate.

Key words: Thiobacillus ferrooxidans, airlift reactor, growth, Fe2+ oxidation, dissolved oxygen

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