Preparation of Biotic and Abiotic Iron Oxide Nanoparticles (IOnPs) and Their Properties and Applications in Heterogeneous Catalytic Oxidation

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• 作者：Haeryong Jung ; Hosik Park ; Jun Kim ; Ji-Hoon Lee ; Hor-Gil Hur ; Nosang V. Myung ; Heechul Choi
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：July 1, 2007
• 年：2007
• 卷：41
• 期：13
• 页码：4741 - 4747
• 全文大小：393K
• 年卷期：v.41,no.13(July 1, 2007)
• ISSN：1520-5851

文摘

Iron oxide nanoparticles (IOnPs) as solid catalyst wereprepared using a biotic method, i.e., biomineralization, andabiotic methods, i.e., thermal decomposition and electrochemical methods, for use as solid catalysts in theheterogeneous catalytic ozonation of para-Chlorobenzoicacid (pCBA). It was determined that characteristics of IOnPs,including particle size, morphology, surface area,electrokinetic mobility, basic group content, and chemicalcomposition were significantly influenced by the preparationmethods. TEM and FE-SEM analyses showed that the thermaldecomposition method produced monodispersed andregularly spherical particles. The smallest iron oxide wasalso prepared by the thermal decomposition method,whereas the electrochemical method produced the largestiron oxide in terms of mean particle size. The specificsurface area was found to be inversely proportional to themean particle size. In catalytic ozonation at acidic pHlevels, it was clearly observed that IOnPs enhanced thedegradation of pCBA by the production of OH radicalsresulting from the catalytic decomposition of ozone.Additionally, functional groups and surface area werefound to play an important role in the catalytic activity ofIOnPs. To this extend, in a comparison of particle types,IOnPs prepared by the thermal decomposition method (IO_TD)showed the greatest catalytic activity in terms of R_ctvalue representing the ratio of hydroxyl radicals and ozone.This result may be due to the relatively higher surfacearea and basic group content of IO_TD than other IOnPs.