Decomposition of sulfadiazine in a sonochemical Fe0-catalyzed persulfate system: Parameters optimizing and interferences of wastewater matrix
Decomposition of sulfadiazine in a sonochemical Fe0-catalyzed persulfate system: Parameters optimizing and interferences of wastewater matrix
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磺胺嘧啶在声化学 Fe0 催化过硫酸盐体系中的分解：参数优化和废水基质的干扰
DOI：
10.1016/j.apcatb.2015.12.004
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发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
Xiaohui Wu
中科院分区：
文献类型：
--
作者：
Tao Zhou;Xiaoli Zou;Juan Mao;Xiaohui Wu
研究了Fe 0催化声化学类芬顿体系（Sono-FL）对磺胺嘧啶（SD）的有效降解。通过响应面分析法（RSM）得到了最佳实验条件：pH 7.00、0.94 mM Fe 0、1.90 mM过硫酸盐（PS）和20 W超声（US）功率，该条件下SD降解率可达90%。然后，分别考察了废水基质（5种无机阴离子和2种螯合剂）对该体系降解SD的影响。结果表明，SO 42-、NO3-、HCO 3-/CO 32-和H2 PO 4-对SD降解均有不同程度的抑制作用。Cl−在低剂量（5 mM）下会导致增强，但在高剂量（100 mM）下会导致抑制。出乎意料的是，随着SD的分解，也发现了氯代有机中间体。适量的草酸（OxA）或EDTA有利于Sono-FL体系对SD的降解，过量的螯合剂会成为竞争性污染物。总结了无机阴离子主要与SO 4自由基dot−和/或自由基dotOH反应形成氧化电位较低的亚自由基。OxA和EDTA不仅参与了Fe 0的络合溶解，而且通过铁配体引起的电子转移反应提供了H2 O2和[FeIVO]2+等氧化剂。
Effective decomposition of antibiotic sulfadiazine (SD) in a Fe0-catalyzed sonochemical Fenton like system (Sono-FL) was demonstrated. By using the response surface methodology (RSM), an optimized experimental condition of pH 7.00, 0.94 mM Fe0, 1.90 mM persulfate (PS) and 20 W ultrasound (US) power was concluded, which could reach the predicted SD degradation efficiency of 90%. Afterwards, effects of wastewater matrix (five inorganic anions and two chelating agents) on the SD degradation were investigated in the system, respectively. It was found that the SD degradation could be inhibited by SO42−, NO3−, HCO3−/CO32−and H2PO4−to different extents. Cl−would lead to an enhancement with a low dosage (5 mM), but an inhibition with a high dosage (100 mM). Unexpectedly, chlorinated organic intermediates were also found as SD decomposed. Appropriate dosages of oxalic acid (OxA) or EDTA could benefit the SD degradation in the Sono-FL system, while excessive chelating agents would play as competitive pollutants. It was summarized that inorganic anions would mainly react with SO4radical dot−and/or radical dotOH to form sub-radicals of less oxidative potential. OxA and EDTA would not only participate in complexing dissolution of Fe0but also provide additional oxidants such as H2O2and [FeIVO]2+, through the electron transfer reactions caused by the iron-ligands species.
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