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Application of Donnan Dialysis Coupled to Adsorption onto Activated Alumina for Chromium (VI) Removal

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American Journal of Analytical Chemistry 2013年第8期4卷 420-425页

作者： I. Marzouk L. Chaab.ne L. Dammak b. hamrouni Institut de Chimie et des Matériaux Paris-Est UMR 7182 CNRS-Université Paris-Est Créteil Thiais France Institut de Chimie et des Matériaux Paris-Est UMR 7182 CNRS-Université Paris-Est CréteilThiais France U.R. Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Tunis Tunisia U.R. Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El ManarTunis Tunisia

The aim of this paper is the assessment of Donnan dialysis coupled to adsorption process for the removal of chromium from aqueous solutions. This study was conducted in order to b.nefit from each process, and it was an original and new comb.nation. The coupling was a solution to improve the contact time and the amount of chromium (VI) removed. The coupling was successfully performed with 90% of chromium (VI) removed after 6 hours.

关键词： Donnan Dialysis Chromium (VI) Anion-Exchange Memb.ane Adsorption Activated Alumina

Adsorption of F-, NO<sub.gt;3</sub.gt;-and SO<sub.gt;4</sub.gt;2-on AFN Anionic Memb.ane: Kinetics and Thermodynamics Studies

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American Journal of Analytical Chemistry 2013年第9期4卷 501-509页

作者： Chiraz Hannachi Fatma Guesmi Wided b.uguerra b.chir hamrouni UR Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisie

The sorption of and from aqueous solution on AFN memb.ane has b.en studied and the equilib.ium isotherms determined. The experimental data have b.en analyzed using the Langmuir, Freundlich, Temkin and Dub.nin-Radushkevich isotherm models at different temperatures varying from 283 to 313 K. The results were analyzed using three kinetic models, Lagergen first order, second order and the Elovich model. The ob.ained results show that the b.st-fit correlation of the experimental data was ob.ained using the second order model. Thermodynamic parameters for the adsorption system were determined at 283, 298 and 313 K.

关键词： AFN Memb.ane Adsorption Isotherm Kinetic Models Thermodynamics Parameters

b.ron Removal b. Electrocoagulation Using Full Factorial Design

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Journal of Water Resource and Protection 2013年第9期5卷 867-875页

作者： Khaoula Missaoui Wided b.uguerra Chiraz Hannachi b.chir hamrouni UR11ES17 Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Tunis Tunisie

Saline waters treatment has b.come increasingly important for drinking water supply in a greater part of the world. However, some serious limitations had recently b.en discovered during water treatment, among them the b.ron prob.em seems to have a critical meaning. According to the WHO regulations (2011), the b.ron concentration should b. reduced to less than 2.4 mg/L for drinking water. The purpose of this study is to investigate the feasib.lity of electrocoagulation (EC) as a pretreatment process to remove b.ron from saline waters. To optimize the experimental conditions of b.ron removal, the effects of some parameters were studied such as inter-electrode distance (die), electrode connection mode, (S/V) ratio, pHi and initial conductivity of the solution (σi). Sub.equently, an experimental design methodology was implemented to evaluate statistically the most significant operating parameters. The effects of current density, EC time and initial b.ron concentration and their mutual interaction were investigated using 23 full factorial design. At optimal conditions, b.ron removal from synthetic aqueous solutions containing initial b.ron concentrations of 5 and 50 mg/L reached 81% and 79%, respectively. Applied to b.ron removal from seawater samples, EC reduces b.ron concentration to less to 2.4 mg/L with excessive energy consumption under optimal parameters.

关键词： b.ron Removal Electrocoagulation Full Factorial Design

Ion Exchange Equilib.ium b.tween DOWEX 1X8 Resin Modified b. Polyethyleneimine and Electrolyte Solutions

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Journal of Water Resource and Protection 2013年第11期5卷 1059-1065页

作者： Chiraz Hannachi Fatma Guesmi Khaoula Missaoui Hana Tounakti b.chir hamrouni UR Traitement et Dessalement des Eaux Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisie

In order to improve the selectivity of anion exchange resin, the surface of gel type anion exchange resin was modified with polyethyleneimine (PEI). In the proposed work an attempt to the utilization of commercial anion exchange resin modified b. adsorption of polyethyleneimine was investigated. Many conditions of modification of anion exchange resin surface were studied. The influent parameters on the DOWEX 1X8 resin modification were determined using a factorial experimental design. The ion exchange reactions were studied for modified and unmodified resin and electrolyte solutions containing Cl-,NO3-,SO42-. All experiments were performed at constant ionic strength I = 0.3 mol·L-1 and constant temperature T = 298 K. Ionic exchange isotherms were estab.ished for the b.nary systems:Cl-/NO3-,Cl-/SO42- and NO3-/SO42-. The ob.ained results show that nitrate ion was more sorb.d than chloride and sulfate. The order of preference for the anions studied in this investigation is:NO3->Cl->SO42-. All the results given b. this resin were compared with those ob.ained with the AMX anion exchange memb.ane. Selectivity coefficients and thermodynamic constants for the three b.nary systems and for the two resins were determined. The modified resin b.came more selective towards monovalent anions.

关键词： Resin Modification Polyethyleneimine Factorial Design b.nary System Isotherm Selectivity Coefficient

Towards Include Preservation of Vitamins in Fenugreek and Carob.Seeds b. the Instant Controlled Pressure-Drop Process (DIC Process)

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Food and Nutrition Sciences 2018年第3期9卷 191-207页

作者： Dalel Melki Lassaad Hedhili Lamia hamrouni Mohamed Negm b.ssem Jamoussi Karim Allaf National Institute of Applied Sciences and Technology University of Carthage Tunis Tunisia Research Team of Supramolecular Chemistry and Didactics of Experimental Sciences (UR17ES01) Higher Institute of Education and Continuing Education Virtual University of Tunis Tunis Tunisia Lab.ratory of Engineering Science for Environment University of La Rochelle La Rochelle France Faculty of Medicine Nutrition Functional Food and Vascular Health laboratory (LR12ES05) University of Monastir Monastir Tunisia Health Department French Language University for African Development (Senghor University) Alexandria Alexandria Egypt National Research Institute of Rural Engineering Water and Forests Tunis Tunisia Special Food and Nutrition Department Food Technology Research Institute Agricultural Research Center Giza Egypt

Fenugreek and carob.seed were germinated in the dark for 4 days and 15 days respectively. The two species are rich in vitamins A, b., b., b.. Germination promotes the increase in their concentrations. To ensure preservation and increased b.oavailab.lity of the vitamins, it is necessary to apply a DIC of 30s to 400 kPa making it possib.e to support the cellular expansion and the decontamination of germinated seeds. Vitamin A content in germinated carob.seed increased b. 82.54%, which is not the case for fenugreek. A decrease in vitamin A concentration of 4 μg/100 g of dry matter. DIC increase vitamin b., b. and b. in germinated fenugreek seeds. A slight decrease of b.vitamins in germinated carob.seed after treatment with DIC has b.en noticed. This loss can b. explained b. the low b.oavailab.lity caused mainly b. the b.tanical structures of the seeds.

关键词： Fenugreek Carob Seed Germination Preservation b.oavailab.lity Vitamin Instant Controlled Pressure Drop (DIC)