Wang Chengjin, Klamerth Nikolaus, Huang Rongfu, Elnakar Haitham, Gamal El-Din Mohamed
Department of Civil and Environmental Engineering, University of Alberta , Edmonton, Alberta Canada , T6G 1H9.
Environ Sci Technol. 2016 Apr 19;50(8):4238-47. doi: 10.1021/acs.est.5b04829. Epub 2016 Mar 31.
This paper investigates the oxidation of oil sands process-affected water (OSPW) by potassium ferrate(VI). Due to the selectivity of ferrate(VI) oxidation, two-ring and three-ring fluorescing aromatics were preferentially removed at doses <100 mg/L Fe(VI), and one-ring aromatics were removed only at doses ≥100 mg/L Fe(VI). Ferrate(VI) oxidation achieved 64.0% and 78.4% removal of naphthenic acids (NAs) at the dose of 200 mg/L and 400 mg/L Fe(VI) respectively, and NAs with high carbon number and ring number were removed preferentially. (1)H nuclear magnetic resonance ((1)H NMR) spectra indicated that the oxidation of fluorescing aromatics resulted in the opening of some aromatic rings. Electron paramagnetic resonance (EPR) analysis detected signals of organic radical intermediates, indicating that one-electron transfer is one of the probable mechanisms in the oxidation of NAs. The inhibition effect of OSPW on Vibrio fischeri and the toxicity effect on goldfish primary kidney macrophages (PKMs) were both reduced after ferrate(VI) oxidation. The fluorescing aromatics in OSPW were proposed to be an important contributor to this acute toxicity. Degradation of model compounds with ferrate(VI) was also investigated and the results confirmed our findings in OSPW study.
本文研究了高铁酸钾（VI）对油砂工艺影响水（OSPW）的氧化作用。由于高铁酸盐（VI）氧化的选择性，在铁（VI）剂量<100mg/L时，二环和三环荧光芳烃被优先去除，而单环芳烃仅在铁（VI）剂量≥100mg/L时被去除。在铁（VI）剂量为200mg/L和400mg/L时，高铁酸盐（VI）氧化分别实现了64.0%和78.4%的环烷酸（NAs）去除率，且碳数和环数较高的NAs被优先去除。氢核磁共振（（1）H NMR）光谱表明，荧光芳烃的氧化导致一些芳香环的开环。电子顺磁共振（EPR）分析检测到有机自由基中间体的信号，表明单电子转移是NAs氧化过程中可能的机制之一。高铁酸盐（VI）氧化后，OSPW对费氏弧菌的抑制作用和对金鱼原代肾巨噬细胞（PKMs）的毒性作用均降低。OSPW中的荧光芳烃被认为是这种急性毒性的重要贡献者。还研究了高铁酸钾（VI）对模型化合物的降解作用，结果证实了我们在OSPW研究中的发现。
