Catalkaya Ebru Cokay, Kargi Fikret
Department of Environmental Engineering, Dokuz Eylul University, Buca, Izmir, Turkey.
Chemosphere. 2007 Sep;69(3):485-92. doi: 10.1016/j.chemosphere.2007.04.033. Epub 2007 May 24.
Advanced oxidation of diuron in aqueous solution by Fenton's reagent using FeSO(4) as source of Fe(II) was investigated in the absence of light. Effects of operating parameters namely the concentrations of pesticide (diuron), H(2)O(2) and Fe(II) on oxidation of diuron was investigated by using Box-Behnken statistical experiment design and the surface response analysis. Diuron oxidation by the Fenton reagent was evaluated by determining the total organic carbon (TOC), diuron, and adsorbable organic halogen (AOX) removals. Concentration ranges of the reagents resulting in the highest level of diuron oxidation were determined. Diuron removal increased with increasing H(2)O(2) and Fe(II) concentrations up to a certain level. Diuron concentration had a more profound effect than H(2)O(2) and Fe(II) in removal of diuron, TOC and AOX from the aqueous solution. Nearly complete (98.5%) disappearance of diuron was achieved after 15min reaction period. However, only 58% of diuron was mineralized after 240min under optimal operating conditions indicating formation of some intermediate products. Optimal H(2)O(2)/Fe(II)/diuron ratio resulting in the maximum diuron removal (98.5%) was found to be 302/38/20 (mgl(-1)).
在无光条件下，研究了以硫酸亚铁（FeSO₄）作为亚铁（Fe(II)）源，通过芬顿试剂对水溶液中敌草隆进行的高级氧化。采用Box-Behnken统计实验设计和表面响应分析，研究了操作参数（即农药（敌草隆）、过氧化氢（H₂O₂）和亚铁（Fe(II)）的浓度）对敌草隆氧化的影响。通过测定总有机碳（TOC）、敌草隆和可吸附有机卤素（AOX）的去除率来评估芬顿试剂对敌草隆的氧化效果。确定了导致敌草隆氧化水平最高的试剂浓度范围。敌草隆的去除率随着H₂O₂和Fe(II)浓度的增加而增加，直至达到一定水平。在从水溶液中去除敌草隆、TOC和AOX方面，敌草隆浓度的影响比H₂O₂和Fe(II)更为显著。反应15分钟后，敌草隆几乎完全（98.5%）消失。然而，在最佳操作条件下反应240分钟后，只有58%的敌草隆被矿化，这表明形成了一些中间产物。导致敌草隆去除率最高（98.5%）的最佳H₂O₂/Fe(II)/敌草隆比例为302/38/20（mg L⁻¹）。
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