Ibuprofen removal by heated persulfate in aqueous solution: A kinetics study
Ibuprofen removal by heated persulfate in aqueous solution: A kinetics study
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DOI：
10.1016/j.cej.2012.05.051
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发表时间：
2012-07-15
影响因子：
15.1
通讯作者：
Kibbi, Nadine
中科院分区：
文献类型：
--
作者：
Ghauch, Antoine;Tuqan, Al Muthanna;Kibbi, Nadine
文献中讨论了热激活过硫酸盐(TAP)作为受污染污水的修复选项。以布洛芬(IBU)为模型污染物，过硫酸钠(SPS)为模型氧化剂，考察了操作参数对氧化降解过程的影响。试验参数包括SPS和IBU初始浓度、活化温度、溶液pH和离子强度。一个具体的目标是找出更合适的动力学模型，在特定条件下可以与实验数据拟合。在60摄氏度下进行了一系列实验，只保持两种反应物中的一种(IBU或SPS)超过，同时改变另一种的浓度。用多项式回归分析IBU衰变，并根据得到的二阶多项式方程计算了相对t(1/2)。结果表明，在60℃、pH 6.8-7.0、[IBU](0)7.33-20.36、[SPS](0)、[SPS](1)等实验条件下，氧化初期(类似于1-2个半衰期)反应可用动力学速率方程-d[IBU]/dt=2.71×10~(-4)(mm min(-1))[IBU](0.25)[SPS](1)描述。HPLC/MS分析表明，在整个处理过程中没有副产物，这表明IBU至少有部分矿化。研究结果证实，开发的TAP工艺模型可用于处理少量含IBU类医院污水的热点废水。(C)2012爱思唯尔B.V.保留所有权利。
Thermally activated persulfate (TAP) is discussed in the literature as remediation option for contaminated effluents. The present paper assesses the impact of selected operational parameters on the involved oxidative degradation using ibuprofen (IBU) as model contaminant and sodium persulfate (SPS) as model oxidizing agent. Tested parameters included SPS and IBU initial concentrations, activation temperature, solution pH and ionic strength. A specific objective was to identify the more appropriate kinetics model that can fit with the experimental data under specific conditions. A series of experiments were conducted at 60 degrees C keeping in excess only one of the two reactants (IBU or SPS) while varying the concentration of the other. Polynomial regressions were used to analyze IBU decay and relative t(1/2) were calculated based on the second order polynomial equations obtained. The results showed that at the initial stage of the oxidation (similar to 1-2 half-lives), the reactions can be described by the kinetics rate equation -d[IBU]/dt = 2.71 x 10(-4) (mM min(-1)) [IBU](0.25)[SPS](1) within the experimental conditions applied here e.g. 60 degrees C, pH 6.8-7.0, [IBU](0) 7.33-20.36 mu M and [SPS](0) 1.0-2.8 mM. HPLC/MS analysis showed the absence of by-products throughout the treatment process indicating at least partial mineralization of IBU. The results of this study confirmed that the developed model of TAP technology could be an adequate approach for specific treatment of small volumes of hot spot wastewater containing IBU like hospital effluents. (C) 2012 Elsevier B.V. All rights reserved.