Citation:
WANG Ying-Li, BAO Gai-Ling, ZHAI Yun-Pu, SU Yun-Lai. Preparation of Nanometer-Sized Fe2O3 in Sodium Dodecylbenzenesulfonate Microemulsion[J]. Chinese Journal of Applied Chemistry,
;2005, 22(12): 1329-1332.
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Nanoparticles of ferric oxide prepared by traditional methods are easy to aggregate in water phase,which leads to a decrease in its catalytic activity.To solve the problem,nanoparticles of ferric oxide were(prepared) in an oil-water two-phase system.To prepare the microemulsion,dodecylbenzenesulfonic acid sodium(DBS),methylbenzene,and butanol were respectively used as surfacetant(S),oil phase(O),and consurfactant(A).The conductivity measurement results showed that dodecylbenzenesulfonic acid sodium microemulsion had the largest solubilization when V(A)/V(O)=0.25,and m(A)/m(S)=1.50,and the extraction rate of Fe(OH)3 from the water phase into the oil phase is near 100% at pH=2.0~2.8.TG-DTA,XRD,H2-TPR,FT-IR,and particle size analysis were used to characterize their microstructure,and the amorphous nanoparticles(17.1 nm) of Fe2O3 were found to exhibit a narrow size distribution.The H2-TPR reduction peak temperature was siginificantly lower than that of the common ferric oxide.The major component of the powder usher was FeOOH,which was converted into Fe3O4 and finally into Fe2O3 with the increase of the calcination temperature,but aggregation phenomenon became evident when the temperature was increased further,and the best calcination temperature was 400℃.
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Keywords:
- microemulsion,
- conductivity,
- rate of extraction,
- ferric oxide
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