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RSC Advances · 2015 ·Vol. 5 ·期 115 ·94694-94701 · IF 3.84

Lithium iron phosphate (LiFePO4) as an effective activator for degradation of organic dyes in water in the presence of persulfate

Xue-ming Lin,Yong-wen Ma,Yan Wang,Jin-quan Wan,Ze-yu Guan

Lithium iron phosphate (LiFePO4) was prepared and applied in the heterogeneous activation of persulfate (PS) for Orange G (OG) degradation in water. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were used to characterize the properties of the material before and after activation. The effects of several parameters on its catalytic activity were also investigated. It was found that the catalyst presented ultrafast activity for OG and other organic dye degradations. The results from XPS further suggested that the highly catalytic efficiency possibly involved the activation of PS to sulfate radicals as main radical meditated by the redox pair of Fe(II)/Fe(III) of LiFePO4/FePO4.

研究领域: 环境科学 · 材料科学 · 化学工程

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JOURNAL OF CHROMATOGRAPHY A · 2014 · IF 4.258

Novel amphiphilic polymeric ionic liquid-solid phase micro-extraction membrane for the preconcentration of aniline as degradation product of azo dye Orange G under sonication by liquid chromatography–tandem mass spectrometry

Mei-Qiang Cai,Xiao-Qing Wei,Chun-Hui Du,Xu-Ming Ma,Mi-Cong Jin

A novel amphiphilic polymeric ionic liquid membrane containing a hydrophilic bromide anion and a hydrophobic carbonyl group was synthesized in dimethylformamide (DMF) systems using the ionic liquid 1-butyl-3-vinylimidazolium bromide (BVImBr) and the methylmethacrylate (MMA) as monomers. The prepared amphiphilic ploy-methylmethacrylate-1-butyl-3-vinylimidazolium bromide (MMA-BVImBr) was characterized by a scanning electron microscope and an infrared spectrum instrument. The results of solid-phase micro-extraction membrane (SPMM) experiments showed that the adsorption capacity of membrane was about 0.76 μg μg −1 for aniline. Based on this, a sensitive method for the determination of trace aniline, as a degradation product of azo dye Orange G under sonication, was developed by liquid chromatography–tandem mass spectrometry (LC–MS/MS). The calibration curve showed a good linearity ranging from 0.5 to 10.0 μg L −1 with a correlation coefficient value of 0.9998. The limit of quantification was 0.5 μg L −1 . The recoveries ranged from 90.6% to 96.1%. The intra- and inter-day relative standard deviations were less than 8.3% and 10.9%. The developed SPMM-LC–MS/MS method was used successfully for preconcentration of trace aniline produced during the sonication of Orange G solution.

CAS / MDL: 1936-15-8 78-67-1 68-12-2 1033461-45-8

研究领域: 分析化学 · 环境科学 · 材料科学

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Lithium iron phosphate (LiFePO4) as an effective activator for degradation of organic dyes in water in the presence of persulfate

Novel amphiphilic polymeric ionic liquid-solid phase micro-extraction membrane for the preconcentration of aniline as degradation product of azo dye Orange G under sonication by liquid chromatography–tandem mass spectrometry