物理化学学报 >> 2012, Vol. 28 >> Issue (09): 2214-2220.doi: 10.3866/PKU.WHXB201206122

材料物理化学 上一篇    下一篇

网状多级孔结构氧化铁的制备、合成机理及其光催化性质

范海滨, 张东凤, 郭林   

  1. 北京航空航天大学化学与环境学院, 北京100191
  • 收稿日期:2012-05-02 修回日期:2012-06-11 发布日期:2012-08-02
  • 通讯作者: 张东凤, 郭林 E-mail:dfzhang@buaa.edu.cn;guolin@buaa.edu.cn
  • 基金资助:

    国家重点基础研究发展规划项目(973) (2010CB934700), 国家自然科学基金(21173015)及中央高校基本科研基金(YWF-11-03-Q-085)资助

Fabrication, Formation Mechanism and the Photocatalytic Properties of Hierarchical Porous Hematite Networks

FAN Hai-Bin, ZHANG Dong-Feng, GUO Lin   

  1. School of Chemistry and Environment, Beihang University, Beijing 100191, P. R. China
  • Received:2012-05-02 Revised:2012-06-11 Published:2012-08-02
  • Contact: ZHANG Dong-Feng, GUO Lin E-mail:dfzhang@buaa.edu.cn;guolin@buaa.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2010CB934700), National Natural Science Foundation of China (21173015), and Fundamental Research Funds for the Central Universities, China (YWF-11-03-Q-085).

摘要:

以九水合硝酸铁为原料, 利用改进的聚合诱导胶体聚集(PICA)的方法制备出三维网络状多级孔结构氧化铁(HPH). 此结构的制备关键是在合成过程中尿素和甲醛聚合生成脲醛树脂(UF). 脲醛树脂一方面在铁的羟基氧化物生长过程中与之杂化形成杂化产物Fe-UF, 另一方面则进一步聚合, 形成脲醛树脂微球(UFM). 脲醛树脂微球作为模板诱导杂化产物Fe-UF在其表面的聚集. 微球与微球之间则由于表面存在的脲醛树脂间的聚合会相互交联形成网络状结构. 经过煅烧处理后, 脲醛树脂及脲醛树脂微球的分解导致不同尺寸孔结构的生成. 光催化研究结果表明, 产物对罗丹明B的降解效率是商用纳米氧化铁的4倍.

关键词: α-Fe2O3, 多级孔结构, 聚合诱导胶体聚集法, 光催化降解

Abstract:

Hierarchical porous hematite (HPH) network structures were successfully constructed using an improved polymerization induced colloid aggregation process with Fe(NO3)3·9H2O as the raw material. The polymerization between urea and formaldehyde into urea-formaldehyde (UF) resin is the key factor for this construction. The UF resins appear to be advantageous in two respects: the UF oligomer hybrids with ferric hydroxide (Fe-UF) and UF polymer formed microcapsules (UFM) acted as templates to induce the aggregation of Fe-UF hybrids into mesoporous spheres. The further crosslink reactions among the hybrid spheres generate the network structure. After calcination, the decomposition of the UF resin and the UFM produces nanopores in the nanorod subunits and macropores in the network structure, respectively. The photodegradation activity of the unique structured HPH is four times that of the commercial hematite nanoparticles with rhodamine B (RhB) as pollutant.

Key words: α-Fe2O3, Hierarchical porous structure, Polymerization induced colloid aggregation method, Photodegradation

MSC2000: 

  • O648