Degradation of carbamazepine by Fe(II)-activated persulfate process
Degradation of carbamazepine by Fe(II)-activated persulfate process
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DOI：
10.1016/j.jhazmat.2014.01.010
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发表时间：
2014-03-15
影响因子：
13.6
通讯作者：
Chu, W.
中科院分区：
文献类型：
--
作者：
Rao, Y. F.;Qu, Liang;Chu, W.
研究了铁（II）活化过硫酸盐法氧化降解卡马西平（CBZ）的实验研究。结果表明，Fe2+/S2O82-工艺对CBZ的去除非常有效，且具有两阶段动力学特征（初始快速衰减后为迟滞期）。CBZ降解反应与pH有关，在2.00 ~ 7.87范围内的最佳pH为3.0。Fe2+和S2O82-的浓度对CBZ的去除率有显著影响，其中[S2O82-]对CBZ去除率的影响比[Fe2+]更为显著。结果表明，CBZ、Fe2+和S2O82-的最佳摩尔比为1:5:40。在最佳条件下，考察了各种无机阴离子对CBZ去除率的影响。阴离子NO3-、SO42-和H2PO4-对该过程的性能有负面影响，而Cl-则加速了CBZ的降解。Cl-浓度越高，CBZ的衰变速率越快。在有和没有Cl-存在的情况下，对CBZ降解过程中的中间体进行了鉴定。比较了这两种情况下中间产物的进化。据此提出了CBZ的衰变路径。(C) 2014 Elsevier B.V.版权所有
Experimental studies were conducted to investigate the oxidative degradation of carbamazepine (CBZ), one of the most frequently detected pharmaceuticals in various waters, by Fe(II)-activated persulfate process. Results show that the Fe2+/S2O82- process is very effective for the elimination of CBZ and characterized by a two-stage kinetics (a rapid initial decay followed by a retardation stage). CBZ degradation reaction was observed to be pH dependent and the optimum pH is 3.0 in the range of 2.00-7.87. The concentration of Fe2+ and S2O82- exhibited a noticeable influence on CBZ removal efficiency, where [S2O82-] exerted more significant effects than that of [Fe2+]. The optimal molar ratio of CBZ, Fe2+, and S2O82- is found to be 1:5:40. The effect of various inorganic anions on CBZ removal was also evaluated under the optimal conditions. The anions NO3-, SO42- and H2PO4- caused a negative effect on the performance of this process, while Cl- interestingly accelerated CBZ degradation. The higher the Cl- concentration, the faster the CBZ decay rate. The intermediates were identified during CBZ degradation with and without the presence of Cl-. The evolution of intermediates for these two scenarios was compared. The decay pathways of CBZ were proposed accordingly. (C) 2014 Elsevier B.V. All rights reserved.