Eng Yong Yong, Sharma Virender K, Ray Ajay K
Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore.
Chemosphere. 2006 Jun;63(10):1785-90. doi: 10.1016/j.chemosphere.2005.08.062. Epub 2005 Nov 21.
Iron in its familiar form exists in the +2 and +3 oxidation states, however, higher oxidation state of iron +6, ferrate(VI) (Fe(VI)O(4)(2-)) can be obtained. The high oxidation power of ferrate(VI) can be utilized in developing cleaner ("greener") technology for remediation processes. This paper demonstrates the unique property of ferrate(VI) to degrade almost completely the cationic surfactant, cetylpyridinium chloride (C(5)H(5)N(+)(CH(2))(15)CH(3).H(2)O Cl(-), CPC). The Rate law for the oxidation of CPC by ferrate(VI) at pH 9.2 was found to be: -d[Fe(VI)]/dt = k[Fe(VI)]CPC. Ferrate(VI) oxidizes CPC within minutes and molar consumption of ferrate(VI) was nearly equal to the oxidized CPC. The decrease in total organic carbon (TOC) from CPC was more than 95%; suggesting mineralization of CPC to carbon dioxide. Ammonium ion was the other product of the oxidation. This is the first report in which Fe(VI)O(4)(2-) ion opens the pyridine ring and mineralizes the aliphatic chain of the organic molecule giving inorganic ions.
我们熟悉的铁以+2和+3氧化态存在，然而，铁的更高氧化态+6，高铁酸盐（VI）（Fe（VI）O（4）（2-））是可以获得的。高铁酸盐（VI）的高氧化能力可用于开发更清洁（“更环保”）的修复技术。本文证明了高铁酸盐（VI）几乎能完全降解阳离子表面活性剂十六烷基吡啶氯化物（C（5）H（5）N+（CH（2））（15）CH（3）.H（2）O Cl-，CPC）的独特性质。在pH 9.2时，高铁酸盐（VI）氧化CPC的速率定律为：-d[Fe（VI）]/dt = k[Fe（VI）][CPC]（2）。高铁酸盐（VI）在几分钟内就能氧化CPC，高铁酸盐（VI）的摩尔消耗量几乎与被氧化的CPC相等。CPC中总有机碳（TOC）的减少超过95%；这表明CPC矿化生成了二氧化碳。铵离子是氧化的另一种产物。这是首次报道Fe（VI）O（4）（2-）离子打开吡啶环并使有机分子的脂肪链矿化生成无机离子。
