375-22-4Relevant articles and documents
Dibutyltin perfluoroalkanecarboxylates: Synthesis, NMR characterization and in vitro antitumour activity
Kemmer, Martine,Dalil, Hassan,Biesemans, Monique,Martins, José C.,Mahieu, Bernard,Horn, Ernst,De Vos, Dick,Tiekink, Edward R. T.,Willem, Rudolph,Gielen, Marcel
, p. 63 - 70 (2000)
Three dibutyltin perfluoroalkanecarboxylates have been synthesized, characterized by 1H-, 13C-, 19F- and 117Sn-NMR, M?ssbauer, IR and mass spectroscopy. The structure of tetra-n-butylbis(trifluoroacetato)distann
REACTIVITY OF ELECTROCHEMICALLY GENERATED SUPEROXIDE ANION WITH F-BUTYL IODIDE. SYNTHESIS OF PERFLUORO BUTANOIC ACID
Dapremont-Avignon, C.,Calas, P.,Amatore, C.,Commeyras, A.
, p. 219 (1991)
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Electrocatalytic degradation of perfluorooctanoic acid by LaNixY1-xO3 (Y = Fe, Cu, Co, Sr) gas dispersion electrode
Chen, Yongyang,Guo, Dan,Dong, Xiaochun,Li, Yahui,Huang, Yixuan,Chen, Hao,Li, Shanping
, (2020/12/23)
Perfluorooctanoic acid (PFOA), as a refractory organic pollutant, seriously harms the environment and damages human health. Here, the electrocatalytic method was selected to degrade PFOA. In this work, perovskite catalysts doped with different elements, and corresponding gas diffusion electrodes (GDE) were prepared by the gel-sol method and citric acid complexation method. The crystal structure, microscopic morphology, and electrochemical properties of the LaNixY1-xO3 (Y = Fe, Cu, Co, Sr) perovskite catalyst electrode were analyzed by XRD, TEM, and CV. Moreover, the electrocatalytic performances of the as-prepared electrodes were assessed by the degradation of PFOA, and the Sr-doped GDE exhibited the highest degradation rate of PFOA. The optimum degradation conditions, such as the current density, pH, and initial concentration were also investigated. It was observed that when the current density was 20 mA/cm2, pH was 5, and initial concentration was 0.25 mmol/L, the Sr-doped GDE had the best degradation and defluorination efficiency of PFOA reached 90.0 % and 75.1 %, respectively. High performance liquid chromatography-mass spectrometry (HPLC-MS) was used to analyze the intermediate products of PFOA degradation and obtain the degradation pathway. With the combined action of [rad]OH and O2, PFOA was degraded by stepwise removal of CF2 groups, which were ultimately degraded into F? and CO2.
Heptafluorobutyric acid and preparation method of derivative thereof
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Paragraph 0102; 0105-0107, (2017/07/18)
The invention provides a preparation method of heptafluorobutyric acid. The preparation method comprises the following steps: (A) carrying out an electrochemical fluoridation reaction on n-butyric acid, n-butyryl chloride or n-butyryl fluoride with anhydrous hydrogen fluoride, thus obtaining an electrolytic mixed gas, wherein the current density of the electrochemical fluoridation reaction is 0.025 to 0.033 A/cm, and the reaction temperature is 9 to 13 DEG C; a cooling reflux device is arranged in the electrochemical fluoridation reaction, and the temperature of a cooling medium of the cooling reflux device is -45 DEG C; (B) pumping the electrolytic mixed gas obtained in the step (A) into a reaction kettle filled with an acid-binding agent, thus obtaining heptafluorobutyryl fluoride, wherein the acid-binding agent is triethylamine; (C) mixing the heptafluorobutyryl fluoride obtained in the step (B) with water, and hydrolyzing, thus generating a heptafluorobutyric acid water solution; (D) mixing the heptafluorobutyric acid water solution with KOH, and naturally crystallizing until the concentration of the KOH is 40 to 45 percent, thus obtaining potassium heptafluorobutyrate; (E) acidizing the potassium heptafluorobutyrate by using sulfuric acid, thus obtaining the heptafluorobutyric acid.
The effect of oxygen in the photocatalytic oxidation pathways of perfluorooctanoic acid
Sansotera, Maurizio,Persico, Federico,Rizzi, Valentina,Panzeri, Walter,Pirola, Carlo,Bianchi, Claudia L.,Mele, Andrea,Navarrini, Walter
, p. 159 - 168 (2015/11/10)
The influence of oxygen in the photocatalytic oxidation of perfluorooctanoic acid (PFOA) promoted by a commercial nano-sized titanium dioxide was studied by testing the reaction in different conditions: static air, oxygen flux, nitrogen flux and pre-saturated nitrogen flux. The reaction was monitored by Total Organic Carbon (TOC) analysis and Ionic Chromatography (IC). Shorter chain perfluorocarboxylic acids (PFCAs; Cn, n = 1-7) intermediate degradation products were quantitatively determined by High-Performance Liquid Chromatography combined with Mass Spectrometry (HPLC-MS) analysis. The presence of shorter chain PFCAs in solution was also monitored by 19F NMR. The experimental findings are in agreement with two major oxidative pathways: Cn → Cn-1 photo-redox and β-scissions routes mediated by COF2 elimination. Depending on the experimental conditions, the mutually operating mechanisms could be unbalanced up to the complete predominance of one pathway over the other. In particular, the existence of the β-scissions route with COF2 elimination was corroborated by the isolation and characterization of carbonyl difluoride, a predicted fluorinated decomposition by-product.