Synthesis of an ordered mesoporous carbon with graphitic characteristics and its application for dye adsorption

An ordered mesoporous carbon (OMC) was prepared by a chemical vapor deposition technique using liquid petroleum gas (LPG) as the carbon source. During synthesis, LPG was effectively adsorbed in the ordered mesopores of SBA-15 silica and converted to a graphitic carbon at 800 °C. X-ray diffraction and nitrogen adsorption/desorption data and high-resolution transmission electron microscopy (HRTEM) of the OMC confirmed its ordered mesoporous structure. The OMC was utilized as an adsorbent in the removal of dyes from aqueous solution. A commercial powder activated carbon (AC) was also investigated to obtain comparative data. The efficiency of the OMC for dye adsorption was tested using acidic dye acid orange 8 (AO8) and basic dyes methylene blue (MB) and rhodamine B (RB). The results show that adsorption was affected by the molecular size of the dye, the textural properties of carbon adsorbent and surface-dye interactions. The adsorption capacities of the OMC for acid orange 8 (AO8), methylene blue (MB) and rhodamine B (RB) were determined to be 222, 833, and 233 mg/g, respectively. The adsorption capacities of the AC for AO8, MB, and RB were determined to be 141, 313, and 185 mg/ g, respectively. The OMC demonstrated to be an excellent adsorbent for the removal of MB from wastewater.Web of Scienc

Détermination des enthalpies de fusion et des courbes de solubilité des acides 2,3- et 3,5-diméthylbenzoïques dans le n-hexane. Comparaison avec les résultats obtenus par la méthode d’UNIFAC

Nous avons déterminé:a

Effet de sel sur l'équilibre liquide-liquide des systèmes eau-phénol-sel (KCl, NaCl, LiCl, CaCl

Les diagrammes de phases de l'équilibre liquide-liquide des systèmes Eau-Phénol-Sel (KCl, NaCl, LiCl, CaCl2 et MgCl2) ont été étudiés. Nous avons mis en évidence l'influence de la concentration et du rayon ionique du cation du sel ajouté sur l'allure des courbes binodales et les coordonnées des points critiques maxima de miscibilité

Description of the characteristics influencing the therapeutic management of infertile couples in western Algeria

Objective: The aim of this work is to describe and identify the characteristics that can influence the care of these infertile couples.Material and method: This is a prospective, monocentric study, extending over a period of four years. It is descriptive of a sample of 760 infertile couples treated in the gynaecology and obstetrics department of the Oran hospital and university establishment of 1st November 1954.&nbsp;Results: The study revealed that primary infertility was 74%. The average duration of infertility was 4.8 ± 0.2 years (minimum 6 months, maximum 25 years); the average age of infertile couples was 33.2 ± 0.4 years (minimum 18 years, maximum 45 years) in women and 39.5 ± 0.5 years (minimum 23 years, maximum 71 years) in men. The male origin of infertility was 30.4%, mixed at 29.2%, female at 27% and unexplained at 13.4%. Oligo-astheno-severe teratospermia dominated male infertility at 30.4%. Tubal causes 23.4% and ovulatory causes 22.8% were mainly of female origin of infertility.&nbsp;Conclusion: The study of these characteristics showed a delay in the treatment of infertile couples. The primary type and long duration of infertility and the advanced age of both women and men make the chances of conception minimal. The male origin of infertility is more important than the female origin, suggesting a deterioration in sperm parameters. Tubal causes in the female origin of infertility are important because of the increasing prevalence of sexually transmitted infections.</p

Passivated TiN nanocrystals/SiN trapping layer for enhanced erasing in nonvolatile memory

International audienc

Mechanochemically improved surface properties of activated carbon cloth for the removal of As(V) from aqueous solutions

Modified activated carbon cloth is prepared by mechanochemical modification of viscose rayon carbon cloth. The effects of different milling atmospheres, in the air and inert conditions, were investigated. Changes in kind and number of acidic and basic surface groups on the surface of activated carbon cloth, upon modification, as well as before and after the sorption of arsenic were determined. Higher number of basic groups responsible for the removal of arsenic ions was achieved by modification under inert conditions. Breakage and collapse of cylindrical fibers, decrease of particle sizes, change in the shape and consistency of the particles, as well as increase of microstructural disorder i.e. the loss of turbostratic structure occurred upon milling. pHPZC values increased from 4.46 to 5.04 and 5.77 after the air and inert milling, respectively. Adsorption followed pseudo second order kinetics with chemisorption as rate-controlling step. Langmuir isotherm best fit the equilibrium data and maximum adsorption capacity is 5.5 mg g−1 at a pH value close to 7.0, typical for groundwater. The mechanism of arsenic adsorption onto activated carbon cloth milled in inert atmosphere involved electrostatic and dispersive interactions between arsenic ions and carbon particles in wide pH range (from 2 to 10)