Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (09): 2214-2220.doi: 10.3866/PKU.WHXB201206122

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

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).

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