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Majdi Mabrouk Mickael Marchand Jean-Marie Baronnet Florent Lemont 《Plasma Chemistry and Plasma Processing》2016,36(4):1085-1110
This work deals with incineration of organic liquid wastes using an oxygen thermal plasma jet, submerged in water. The results presented here concern incineration of trichloroethylene (TCE). During a trial run, the CO2 and CO content in the exhaust gas is continuously measured; samples taken periodically from the solution are analyzed by appropriate methods: total organic carbon and chlorine content are measured. Process efficiency during tests with a few L/h of TCE is given by the mineralization rate. The trapping rate of chlorine as HCl is near 100 %. The TCE destruction and removal efficiency, measured by MS/GC, is better than 99.9999 %. A simplified kinetic model of gas quenching was constructed from a single-phase plug-flow reactor model taking into account 14 species and 34 reactions. It satisfies the requirements of heat balance and major components analysis, and reveals the major role of the OH radical on the concentrations of CO as well as HCl and/or Cl2 in the off-gas stream. 相似文献
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TiO2-mediated photocatalysis is widely used in a variety of applications and products in the environmental and energy fields, including photoelectrochemical conversion, self-cleaning surfaces, and especially water purification systems. The dimensionality of the structure of a TiO2 material can affect its properties, functions, and more specifically, its photocatalytic performance. In this work, the photocatalytic inactivation of Gram-negative Escherichia coli using three photocatalysts, differing in their structure and other characteristics, was studied in a batch reactor under UVA light. The aim was to establish the disinfection efficiency of solid TiO2 compared with that of suspended catalysts, widely considered as reference cases for photocatalytic water disinfection. The bacterial inactivation profiles obtained showed that: (1) the photoinactivation was exclusively related to the quantity of photons retained per unit of treated volume, irrespective of the characteristics of the photocatalyst and the emitted light flux densities; (2) across the whole UV light range studied, each of the photocatalytic solids was able to achieve more than 2 log bacterial inactivation with less than 2 h UV irradiation; (3) none of the used catalysts achieved a total bacterial disinfection during the treatment time. For each of the catalysts the quantum yield has been assessed in terms of disinfection efficiency, the 2D material showed almost the same performance as those of suspended catalysts. This catalyst is promising for supported photocatalysis applications. 相似文献
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H. Heli A. Jabbari S. Majdi M. Mahjoub A. A. Moosavi-Movahedi Sh. Sheibani 《Journal of Solid State Electrochemistry》2009,13(12):1951-1958
The electrooxidation of several non-steroidal anti-inflammatory drugs (indomethacin, mefenamic acid, and diclofenac) was investigated
on nanoparticles of Ni–curcumin-complex-modified glassy carbon (n-GC) electrode in alkaline solution. Surfaces studies were
performed by scanning electron micrographs and atomic force microscopy. The oxidation process and its kinetics were studied
using cyclic voltammetry and chronoamperometry techniques and also pseudo-steady-state polarization measurements. Voltammetric
studies indicated that, in the presence of drugs, the anodic peak current of low-valence nickel species increases, followed
by a decrease in the corresponding cathodic current. This pattern indicates that drugs were oxidized on the redox mediator
immobilized on the electrode surface via an electrocatalytic mechanism. A mechanism based on the electrochemical generation
of Ni(III)-active sites and their subsequent consumption by drugs was proposed. The rate constants of the catalytic oxidation
of drugs and the electron-transfer coefficient are reported. A sensitive, simple, and time-saving amperometric procedure was
developed for the analysis of these drugs in bulk form and for the direct assay of tablets, using the n-GC electrode. 相似文献
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A series of new polyazomethines containing furan moieties was synthesized by polycondensation of bifuranic diamine monomers with commercially available aromatic dialdehydes viz., terephthaldehyde (TPA), isophthaldehyde (IPA). Inherent viscosities and number average molecular weights of polyazomethines were in the range 0.90–1.56 dL/g and 10460–17850 (SEC, polystyrene standard), respectively indicating formation of medium to reasonably high molecular weight polymers. The resulting polyazomethines were characterized by solubility tests, viscosity measurements, FTIR, NMR, UV spectroscopy, differential scanning calorimetric (DSC), and thermogravimetric analysis (TGA). These furan-based polyazomethines were essentially amorphous and exhibited glass transition temperatures (Tg) in the 150–190°C range. The temperature at 10% wt loss (T10), determined from TGA of polyazomethines were in the range 300–380°C, indicating their good thermal stability. 相似文献
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Hossein Heli S. Majdi A. Jabbari N. Sattarahmady A. A. Moosavi-Movahedi 《Journal of Solid State Electrochemistry》2010,14(8):1515-1523
The electrooxidation of dextromethorphan on a composite constructed with carbon nanotube–ionic liquid–carbon microparticles was investigated by cyclic voltammetry in a 100 mM phosphate buffer solution, pH 7.40. In the voltammograms, an irreversible diffusion-controlled anodic peak appeared. The diffusion coefficient of dextromethorphan, the electron-transfer coefficient, and the standard rate constant of the electrooxidation process were found to be 3.45?×?10?6 cm2 s?1, 0.65, and 1.67?×?10?3 cm s?1, respectively. A sensitive and timesaving determination procedure was developed for the analysis of dextromethorphan, and the corresponding analytical parameters were reported. Using this method, dextromethorphan was determined with an LOD and LOQ of 8.81 and 29.36 μM in a linear range of 2.5?×?10?4 to 3.3?×?10?3 M, respectively. The proposed amperometric method was successfully applied to the analysis of commercial pharmaceutical products (syrup and oral drop), and the results were in good agreement with the declared values. 相似文献
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Let ? n be the (2n + 1)-dimensional Heisenberg group, and let T n be the n-dimensional torus acting on ? n by automorphisms. In this paper, we describe the space of admissible coadjoint orbits of the Heisenberg motion group G n = T n ? ? n and we determine the topology of this space. We show that the bijection between the unitary dual ? n of G n and its admissible coadjoint orbit space is a homeomorphism. 相似文献