Nanoporous Carbon Composites for Water Remediation

Metal–organic frameworks (MOFs) are known for their superior surface properties such as surface area and porosity. Thermal decomposition of MOFs may lead to nanoporous carbon composites. These composites can be further used in various application areas. Environmental remediation is one of the most popular areas for using these composites. Nowadays, nanoporous carbon composites are used generally in supercapacitors, lithium-ion batteries, and sensors. Besides the aforementioned application areas, these materials can be used as adsorbents, photocatalysts, and nanomotors. In this review, the preparation methods of nanoporous carbon materials will be explained and their use in environmental remediation will be summarized. The future perspectives of nanoporous carbon composites will be also discussed

STUDY OF HYDRODYNAMICS IN FIXED BED OF COMPOSITE GRANULAR MATERIALS

This study aims at the experimental determination of pressure drop and friction factor at gas flow through fixed beds of granular silica gel, alumina and activated carbon, and establishment of an equation containing a modified friction factor Fm to calculate pressure drop. In order to calculate the modified friction factor, an equation was suggested.The experimental values for pressure drop and friction factor were determined using spherical grains of silica gel, cylindrical grains of alumina and silica gel, alumina and activated carbon impregnated with calcium chloride. By means of the suggested equation, the values of pressure drop in fixed bed were calculated and compared with the experimental values. A good agreement between the predicted and experimental data is noticed

Developing a new advanced treatment technique for micropollutants removal from water and wastewater

This is the final version of the following article : Developing a new advanced treatment technique for micropollutants removal from water and wastewater, which has been published in final form at http://www.lestudium-ias.com/content/developing-new-advanced-treatment-technique-micropollutants-removal-water-and-wastewaterInternational audienceNovel cost-efficient Fenton-like catalysts were prepared for the degradation of organic molecules in aqueous solutions. Porous activated carbons (ACs) were directly impregnated with Fe2+ solutions of different concentrations using the wet impregnation method. Their efficiency, as Fenton-like catalysts, was studied. Photo-Fenton tests were performed to establish the performance of the prepared Fe-impregnated ACs in relation to the degradation of organic micropollutants in aqueous solution, under different conditions. Photo-catalytic tests were carried out by means of a laboratory photo-reactor. The influence of several parameters such as solution pH value, initial concentration of the model pollutant, and hydrogen peroxide dose on the process performance was investigated. The ACs and prepared catalysts were characterized by nitrogen adsorption-desorption isotherms at 77K, FTIR, SEM, and thermogravimetric analyses. The total Fe content of the synthesized composites was estimated by the phenanthroline method using UV-Vis spectrophotometry. Photo-catalytic tests were performed in monosolute or mix solutions of MPs in order to compare the efficiency of various conventional AOPs with that of photo-Fenton-peroxone process. The results show an increase in the degradation rate in case of the heterogeneous photo-Fenton-peroxone process

Mechanisms of para-chlorophenol adsorption onto activated carbons having different textural and chemical properties

WOS: 000403566800024The present study describes the adsorption behavior, mechanisms governing the process and thermodynamics of the separation of p-chlorophenol (4-CP) from aqueous solutions by several granular activated carbons (ACs). The main contribution of this work consists in bringing more insight onto the proper selection of sorbents based on the affinity between them and a specific sorbate with a special regard onto the textural and chemical characteristics of sorbents. Batch tests were conducted in order to evaluate the kinetics, equilibrium and thermodynamics of each considered adsorption system. Equilibrium data were fitted to Langmuir, Freundlich, Sips, Redlich-Peterson and Radke-Prausnitz isotherms in order to elucidate the mechanisms governing the adsorption processes. Also, the kinetics data were analyzed by means of pseudo-first-order, pseudo-second-order, and intraparticle diffusion models The best-fitted adsorption isotherm models were found to be in the order Sips > Redlich-Peterson > Freundlich > Radke-Prausnitz > Langmuir, and the pseudo-second-order model described best the behavior of the adsorption of 4-CP onto each of the five investigated ACs. The adsorption capacity of the AC was found to decrease with temperature. The process of 4-CP adsorption onto AC was spontaneous, and physical in nature and thermodynamically feasible.Romanian National Authority for Scientific Research and Innovation, CNCS - UEFISCDI [PN-II-RU-TE-2014-4-0405]; Laboratories of Ege University, Department of Chemical Engineering, Izmir, TurkeyThis work was supported by a grant of the Romanian National Authority for Scientific Research and Innovation, CNCS - UEFISCDI, project number PN-II-RU-TE-2014-4-0405.; We would like to especially thank CECA, Arkema Group France, for providing us with Aquasorb L27, X17, F22 and S21 granular activated carbon materials and to the Laboratories of Ege University, Department of Chemical Engineering, Izmir, Turkey, for assisting and supporting this work

STUDY OF GAS SEPARATION PROCESS BY DYNAMIC ADSORPTION IN FIXED BED

An experimental study of mass transfer at gas separation by dynamic adsorption in fixed bed of impregnated silica gel is presented in this work. By means of a mathematical model based on constants and coefficient easy to evaluate, the distributions of adsorbate concentration in gas and solid phases were determined as a function of time and throughout the height of the fixed bed, under isothermal conditions.With this aim, water vapors from air were adsorbed in a fixed bed of impregnated silica gel. The values of the volumetric mass transfer coefficient, Kv, were determined experimentally at several values of air superficial velocity, an air relative humidity of 69�20at 38 °C. The influence of the gas flow velocity and initial water concentration in adsorbent on the distribution of water concentration in both phases was established as a function of time and throughout the height of the fixed bed. The results obtained allow one to determination of the local adsorption rate

Magnetic carbon composites as regenerable and fully recoverable adsorbents: Performance on the removal of antidiabetic agent metformin hydrochloride

International audienc

REMOVAL OF AN ACID DYE FROM AQUEOUS SOLUTIONS BY ADSORPTION ON A COMMERCIAL GRANULAR ACTIVATED CARBON: EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDY

The present paper approaches the study of the adsorption of an acid dye on a commercial granular activated carbon (GAC). Batch experiments were conducted to study the equilibrium isotherms and kinetics of Indigo Carmine on GAC. The kinetic data were analyzed using the Lagargren, Ho, Elovich, Weber-Morris and Bangham models in order to establish the most adequate model that describes this process, and to investigate the rate of IC adsorption. Equilibrium data were fitted to Langmuir and Freundlich isotherms. Langmuir isotherm equilibrium model and Ho kinetic model fitted best the experimental data.The effects of temperature (25 – 45 °C), initial concentration of dye (7.5 – 150 mg•L−1), GAC dose (0.02 – 1 g•L-1), particle size (2 – 7 mm in diameter), solution pH (3 – 11) on GAC adsorption capacity were established. The adsorption process is found to be favored by a neutral pH, high values of temperature and small particle sizes. The highest adsorption capacity (133.8 mg•g-1) of the GAC is obtained at 45 °C. The removal efficiency increases with GAC dose at relatively low initial concentrations of dye. Thermodynamic parameters such as standard enthalpy (H), standard entropy (S) and standard free energy (G) were evaluated. The adsorption of Indigo Carmine onto GAC is an endothermic process

Multi-Objective Optimization of Indigo Carmine Removal by an Electrocoagulation/GAC Coupling Process in a Batch Reactor

International audienc