Preparation and surface activity study of amino acid surfactants
In this study, two new surfactants, cetyltrimethylammonium glycine (CTAG) and octadecyltrimethylammonium glycine (OTAG), were prepared in a simple way using cetyltrimethylammonium chloride (CTAC), octadecyltrimethylammonium chloride (OTAC), and glycine. Then the surface activities were evaluated and compared with the two raw materials. The surface activity of CTAG and OTAG, including surface tension, foaming ability, and emulsification, is better than that of CTAC and OTAC in each case. With the glycine, the corrosion inhibition efficiencies of CTAG and OTAG are 91.12% and 97.89%, respectively, which are more effective tha...
Source: Comptes Rendus Chimie - January 29, 2019 Category: Chemistry Source Type: research
Editorial Board - English
Publication date: January 2019Source: Comptes Rendus Chimie, Volume 22, Issue 1Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - January 20, 2019 Category: Chemistry Source Type: research
Editorial Board - French
Publication date: January 2019Source: Comptes Rendus Chimie, Volume 22, Issue 1Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - January 20, 2019 Category: Chemistry Source Type: research
Editorial
Publication date: January 2019Source: Comptes Rendus Chimie, Volume 22, Issue 1Author(s): Pierre Braunstein (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - January 20, 2019 Category: Chemistry Source Type: research
Effect of phosphorus on the performance of IM-5 for the alkylation of toluene with methanol into p-xylene
Publication date: January 2019Source: Comptes Rendus Chimie, Volume 22, Issue 1Author(s): Cui Wang, Yaquan Wang, Hengbao Chen, Xiao Wang, Hongyao Li, Chao Sun, Liying Sun, Chunyang Fan, Xu ZhangAbstractIM-5 zeolite was modified with different amounts of phosphorus species. The effect of the introduction of phosphorus into IM-5 zeolite (P-IM-5) was evaluated on the alkylation of toluene with methanol. The samples were characterized by X-ray diffraction, scanning electron microscopy, N2 physical adsorption, 31P magic angle spinning nuclear magnetic resonance, inductively coupled plasma optical emission spectroscopy, temperat...
Source: Comptes Rendus Chimie - January 20, 2019 Category: Chemistry Source Type: research
Sommaire / Contents
Publication date: January 2019Source: Comptes Rendus Chimie, Volume 22, Issue 1Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - January 20, 2019 Category: Chemistry Source Type: research
Modified bentonite for anionic dye removal from aqueous solutions. Adsorbent regeneration by the photo-Fenton process
This study aims to present an effective solution for pollutant treatment after adsorption onto modified bentonite. Modified bentonite has been taken as a medium to divide the treatment process of Congo red (CR) dye by a photo-Fenton process into two different processes (separation of CR from wastewater by adsorption and degradation of CR on the surface of the adsorbent by the photo-Fenton process). The adsorbent was characterized by scanning electronic microscopy, zeta potential, and diffuse reflectance spectroscopy techniques. Batch adsorption experiments were carried out to study the effect of the contact time on the ads...
Source: Comptes Rendus Chimie - January 18, 2019 Category: Chemistry Source Type: research
Elaboration and characterization of a low-cost porous ceramic support from natural Tunisian bentonite clay
This article describes the development and the characterization of a microfiltration support elaborated using an extrusion method followed by sintering at different temperatures (950, 1000, and 1100 °C). X-ray fluorescence, X-ray diffraction, Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, and differential thermal analysis were used for the characterization of the raw material. The resulting support was characterized by scanning electron microscopy, mechanical and chemical resistance, and water permeability. Each tube was 150 mm in length, with an external diameter of 8 mm an...
Source: Comptes Rendus Chimie - January 15, 2019 Category: Chemistry Source Type: research
Hectorite and bentonite effect on water-based polymer coating rheology
This study investigated the impact of various thixotropic agents (organically modified hectorite and bentonite clays) on water-based oligomer system rheology. Ingredients were evaluated to determine their influence on unreacted composite characteristics (viscosity and pigment suspension stability) and reacted film characteristics (modulus of elasticity, elongation at break, and film adhesion force). It is concluded that clay-based thixotropic agents are suitable for use as a suspension agent in nail polish formulations and, depending on the concentration, can decrease the risk of pigment sedimentation and syneresis. (Sourc...
Source: Comptes Rendus Chimie - January 10, 2019 Category: Chemistry Source Type: research
Production of geopolymer binders using clay minerals and industrial wastes
The objective of this study was to establish the most suitable mixtures of Tunisian illito-kaolinitic clay and industrial wastes (phosphogypsum [PG] and waste brick) to produce geopolymer binders. The raw clay sample was heated at 850 °C and characterized by chemical and thermal analyses, X-ray diffraction, and infrared spectroscopy. Four mixtures with different ratios (4%, 8%, 12%, and 16%) of PG as a partial replacement for the calcined clay were investigated. The obtained mixture powders were dissolved in a strong alkaline solution (10, 14, and 17 mol (NaOH)/L) and the produced geopolymers were preserved for 28 days...
Source: Comptes Rendus Chimie - December 29, 2018 Category: Chemistry Source Type: research
Synthesis, crystal structure, and density functional theory study of a zinc(II) complex containing terpyridine and pyridine-2,6-dicarboxylic acid ligands: Analysis of the interactions with amoxicillin
Publication date: Available online 19 December 2018Source: Comptes Rendus ChimieAuthor(s): Adedibu C. Tella, Joshua A. Obaleye, Margaret D. Olawale, Jean Marie Vianney Ngororabanga, Adeniyi S. Ogunlaja, Susan A. BourneAbstractAn octahedral zinc(II) complex of 2,2′:6′,2″-terpyridine (Tpy) and pyridine-2,6-dicarboxylate (Pydc), [Zn(II)(Tpy)(Pydc)·4H2O] was synthesized and its structure was determined by a single-crystal X-ray diffraction. The ligand pyridine-2,6-dicarboxylate coordinated to the zinc(II) ion via two pairs of carboxylate oxygens and one nitrogen atom, whereas 2,2′:6′,2″-terpyridine also contribute...
Source: Comptes Rendus Chimie - December 20, 2018 Category: Chemistry Source Type: research
Efficient catalytic performance of tetra-alkyl orthotitanates for the oxidative desulfurization of dibenzothiophene at room temperature
In this study, we report that tetra-alkyl orthotitanates exhibited efficient catalytic performance in the oxidative desulfurization of dibenzothiophene. The sulfur content in model oil (1000 ppmw) could be reduced to less than 10 ppmw within 10 min at room temperature and ambient pressure. In addition, the formed sulfones can be easily separated from the oil phase without extraction process. This work will provide a basis for the design of novel oxidative desulfurization catalysts with high desulfurization efficiency. (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - December 15, 2018 Category: Chemistry Source Type: research
Physicochemical characteristics and suitability of curative pastes made of Tunisian clay minerals and thermal waters for use in pelotherapy
This study presents the physicochemical characteristics of peloids prepared from two Tunisian clays, CZ (clay from the region of Zaghouan) and CS (from the region of Siliana), and two thermal mineral waters. The samples were analyzed by several physicochemical techniques: X-ray diffraction, chemical composition (major and minor elements), grain-size distribution, cation-exchange capacity, plasticity index, and thermal properties (cooling kinetic). The results prove that the two clays are suitable for use in Tunisian spa with differences in their characteristics, especially with regard to their composition, plasticity, grai...
Source: Comptes Rendus Chimie - December 15, 2018 Category: Chemistry Source Type: research
Internal path investigation of the acting electrons during the photocatalysis of panchromatic ruthenium dyes in dye-sensitized solar cells
Publication date: Available online 12 December 2018Source: Comptes Rendus ChimieAuthor(s): Nouha Kouki, Salma Trabelsi, Mohamadou Seydou, François Maurel, Bahoueddine TangourAbstractA series of heteroleptic Ru(II) complexes were theoretically investigated using time-dependent density functional theory. These dyes, including K8 and N3, are based on a common motif formed by Ru center, NCS, and polypyridyl ligands, but differ only by the nature of the added group in para position of each pyridyl. The presence of these ligands will enable the evaluation of the electronic effects ±I and ±M. This work focuses on the localizat...
Source: Comptes Rendus Chimie - December 13, 2018 Category: Chemistry Source Type: research
Synthesis and cytotoxicity of two novel alcohols based on a benzo[c]phenanthrene moiety
Publication date: Available online 5 December 2018Source: Comptes Rendus ChimieAuthor(s): Habiba Guédouar, Béchir Ben Hassine, Faouzi AlouiAbstractSynthetically, 1-(benzo[c]phenanthren-2-yl)ethanol and 1-(benzo[c]phenanthren-2-yl)-3-phenylpropane-1,3-diol were successfully obtained from 2-acetylbenzo[c]phenanthrene and methyl benzo[c]phenanthrene-2-carboxylate, respectively, and fully characterized. The desired compounds were purified by silica gel column chromatography, and their structures were characterized by melting points, 1H NMR, 13C NMR, and mass spectroscopy. Next, the in vitro cytotoxicity of the new polyaroma...
Source: Comptes Rendus Chimie - December 6, 2018 Category: Chemistry Source Type: research
