Kinetics and mechanism of the oxidative degradation of parathion by Ferrate(VI)

被引:48
作者
Liu, Hongxia [1 ,2 ]
Pan, Xiaoxue [1 ]
Chen, Jing [1 ]
Qi, Yumeng [1 ]
Qu, Ruijuan [1 ]
Wang, Zunyao [1 ]
机构
[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210023, Jiangsu, Peoples R China
[2] Jiaxing Univ, Nanhu Coll, Jiaxing 314001, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Parathion; Ferrate(VI); Oxidation; Kinetics; Reaction pathways; AQUEOUS-SOLUTIONS; PRODUCT FORMATION; METHYL PARATHION; WATER-TREATMENT; ORGANIC-MATTER; PESTICIDES; PATHWAYS; PH; ADSORPTION; TOXICITY;
D O I
10.1016/j.cej.2019.02.040
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The degradation of parathion (PTH) by ferrate(VI) was investigated to evaluate the potential application of this iron-based chemical oxidant in water treatment. A series of kinetic experiments were conducted to examine the effects of operational parameters like solution pH, oxidant dose and temperature, and water constituents including anions (Cl-, NO3-, HCO3-), cations (Ca2+, Mg2+, Cu2+, Fe3+), and humic acid (HA). The removal of PTH at an initial concentration of 5 mg/L could reach 99% in 300 s under the conditions of [Fe(VI)]: [PTH] = 15:1; T = 25 degrees C and pH = 7.0. The presence of HCO3-, Ca2+, Cu2+, Fe3+ and HA decreased the removal efficiency of PTH, while Cl-, NO3- and Mg2+ had no obvious effects on PTH removal. Moreover, real water samples were also used to explore the feasibility of this Fe(VI) oxidation method. Fe(VI) could attack the P-S double bond, and the P-O single bond connecting the nitrophenol or the ethyl group in PTH molecule, leading to the formation of six products (paraoxon, thiophosphates and phosphates), which were detected by liquid chromatography-time-of-flight-mass spectrometry (LC-TOF-MS). These findings may provide useful information for the environmental elimination of organophosphate pesticides.
引用
收藏
页码:142 / 152
页数:11
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