检索结果-南通市图书馆

Pedosphere 2019年第6期29卷 730-739页

作者： Rim AZOUZI Abdelkrim CHAREF Lamia AYED Samia KHADHAR laboratoire Géoressources Centre des Recherches et Technologies des EauxSoliman 8020(Tunisia) laboratoire d’Analyse Traitement et Valorisation des Polluants de l’Environnement et des ProduitsFacultéde PharmacieRue AvicenneMonastir 5000(Tunisia)

Mornag Plain is a coastal area of the Mediterranean basin, which has undergone an agricultural industrial boom. The aim of this study was to investigate the different water qualities used for irrigation on heavy metal mobility in these polluted agricultural soils. The geo-accumulation indices for heavy metals (Ni, Cr, Pb, Cd, Cu, and Zn) revealed that industrial activities and used treated wastewater (TWW) contributed to soil pollution, and water irrigation always decreased this contamination. After long-term use of different water types, high perturbation of heavy metal redistribution has occurred. Groundwater use altered all heavy metal redistributions in the irrigated soil among various soil-solid and soil-solution fractions, as compared to the unirrigated soil. Slight acid water use transferred some metals from different solid phase components into water-soluble and exchangeable fractions. However, TWW use transformed some Ni, Cr, Cd, Cu, and Zn from water-soluble and exchangeable fractions to less labile fractions, particularly into organically bound fractions. Reuse of conventional water within the same soil decreased the whole soil redistribution index values, indicating tendency to return to the pattern of distribution of groundwater-irrigated soil.

关键词： Exchangeable fraction Geo-accumulation index Labile fraction Mobility factor Organically bound fraction Redistribution index Treated wastewater Water-soluble fraction

XPS characterization and corrosion resistance of cerium-treated magnesium coatings

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2011年第4期30卷 368-373页

作者： Samia Ben Hassen Latifa Bousselmi Patrice Berot El Mustafa Rezrazi Ezzeddine Triki Unité de Recherche Corrosion & Protection des Métalliques ENITBP 37Tunis-BelvédèreTunisie Institut UTINAM CNRS UMR 6213Université de Franche-Comté16 route de Gray 25030 Besanon CedexFrance laboratoire traitement et recyclage des eaux CERTEBorj CedriaTunisie

Cerium conversion treatment was applied on magnesium coatings in a solution containing CeC13. The composition ot the cenum conversion layer on magnesium was investigated using X-ray photoelectron spectroscopy （XPS）, It was revealed that the composition predominately consisted of a three-valent state cerium compound with a relative abundance around 90%. Some of Ce^3＋ was oxidized to Ce^4＋. Electrochemical impedance spectroscopy results revealed that the total impedance of cerium-treated samples increased for a short immersion time in NaC1 solution before coating deteriorating. This deterioration was due to the coating porosity increasing and the breakdown of the conversion layer

关键词： cerium compounds magnesium coatings X-ray photoelectron spectroscopy corrosion resistance

Improvement in corrosion resistance of magnesium coating with cerium treatment

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2009年第3期28卷 277-283页

作者： Samia Ben Hassen Latifa Bousselmi Patrice Berot El Mustafa Rezrazi Ezzeddine Triki Unité de Recherche Corrosion & Protection des Métalliques ENITBP 37Tunis-BelvédèreTunisia Institut UTINAM CNRS UMR 6213Université de Franche-Comté16 route de Gray 25030 Besanon CedexFrance laboratoire traitement et recyclage des eaux CERTEBorj CedriaTunisia

Corrosion protection afforded by a magnesium coating treated in cerium salt solution on steel substrate was investigated using open circuit potential, polarization curves, and electrochemical impedance spectroscopy （EIS） in 0.005 M sodium chloride solution （NaCl）. The morphology of the surface was characterized by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, and X-ray diffraction （XRD）. The cerium treated coating was obtained by immersion in CeCl3 solution. The results showed that the corrosion resistance of the treated magnesium coating was improved. The corrosion potential of the treated coating was found to be nobler than that of the untreated magnesium coating and the corrosion current decreased significantly. Impedance results showed that the cerium treatment increased corrosion protection. The improvement of anti-corrosion properties was attributed to the formation of cerium oxides and hydroxides that gave rise to a physical barrier effect.

关键词： magnesium coating cerium corrosion protection impedance spectroscopy

Cr-Doped TiO_(2)Thin Films Prepared by Means of a Magnetron Co-Sputtering Process:Photocatalytic Application

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2014年第8期5卷 473-482页

作者： Anouar Hajjaji Atef Atyaoui Khaled Trabelsi Mosbah Amlouk Latifa Bousselmi Brahim Bessais My Ali El Khakani Mounir Gaidi Institut National de la Recherche Scientifique INRS-EnergieMatériaux et TélécommunicationsVarennesCanada laboratoire de Photovoltaique Centre de Recherches et des Technologies de l’EnergieTechnopole de Borj-CédriaHammam-LifTunisia laboratoire de traitement et de recyclage des eaux Centre de Recherches et des Technologies des EauxTechnopole de Borj-CedriaHammam-LifTunisia Unitéde Physique des DispositifsàSemi-Conducteurs Facultédes Sciences de TunisCampus UniversitaireTunisTunisia department of Applied Physics University of SharjahSharjahUAE

This paper deals with the effect of Cr content on photocatalytic activity of TiO2 thin films deposited on quartz and intrinsic silicon substrates by using the RF magnetron co-sputtering process. Some physical investigations on such sputtered films were made by means of X-ray Diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy as well as UV-Vis-IR absorption techniques. The heat treatment under oxygen atmosphere at 550°C reveals that the crystalline structure of TiO2: Cr depends on Cr content. Anatase-to-rutile phase transformation occurs at a Cr content of about 7%. On the other hand, the band gap energy value of annealed TiO2: Cr films varies in terms of Cr doping and a transition around 7% of Cr is accrued. The photocatalytic activity of undoped and doped TiO2 films was evaluated by photo-degrading of the amido black under UV light irradiation. Modification of the chemical structure of titanium dioxide by Cr doping allows moving the photocatalytic activity of titanium dioxide towards visible light. The results indicate that films doped with 2% Cr exhibit the highest UV and visible light photocatalytic activity.

关键词： TiO_(2) Cr-Doped TiO_(2) Photocatalysis Opto-Electronic

Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 Béchir 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 by 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 established for the binary systems:Cl-/NO3-,Cl-/SO42- and NO3-/SO42-. The obtained results show that nitrate ion was more sorbed than chloride and sulfate. The order of preference for the anions studied in this investigation is:NO3->Cl->SO42-. All the results given by this resin were compared with those obtained with the AMX anion exchange membrane. Selectivity coefficients and thermodynamic constants for the three binary systems and for the two resins were determined. The modified resin became more selective towards monovalent anions.

关键词： Resin Modification Polyethyleneimine Factorial design Binary System Isotherm Selectivity Coefficient

Adsorption of F-, NO3-and SO42-on AFN Anionic Membrane: Kinetics and Thermodynamics Studies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

作者： Chiraz Hannachi Fatma Guesmi Wided Bouguerra Bèchir 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 membrane has been studied and the equilibrium isotherms determined. The experimental data have been analyzed using the Langmuir, Freundlich, Temkin and Dubinin-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 obtained results show that the best-fit correlation of the experimental data was obtained using the second order model. Thermodynamic parameters for the adsorption system were determined at 283, 298 and 313 K.

关键词： AFN Membrane Adsorption Isotherm Kinetic Models Thermodynamics Parameters

Biodiversity of Pearl Millet [Pennisetum glaucum (L.) R. Br.] in Southern Algeria (Hoggar Region)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2016年第12期7卷 1673-1684页

作者： Mohamed Lemgharbi Badreddine Belhadi Rachid Souilah Ladjel Terbag Djafaar Djabali Boubekeur Nadjemi laboratoire d’etude et de Développement des Techniques d’épuration et de traitement des eaux et Gestion Environnementale Ecole Normale Supérieure de Kouba Alger Algérie laboratoire de Biochimie Département de Biologie Ecole Normale Supérieure Alger Algérie

despite the areas restriction reserved for pearl millet cultivation in Hoggar region, there is an important diversity, which has occupied an essential place in the inhabitants’ diet. For a better knowledge of its biodiversity, seven sites were prospected during the plant maturation period. The morphological and cytological study was undertaken on the basis of the descriptors parameters of the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT). The most widely varied variables were the Height of the Plant (HP), Stem Diameter (ST), Panicle size;Length (PL), Width (PW) and Color (PC). While very low variation was noted in 3rd leave dimensions;Leaf Length (LL), Leaf Width (LW), Number of Nodes (NN) and Seed Form (SF). Therefore, local millet (***, MLH.Z1) and some domesticated (MDH. Saf, MDH.S) appeared as the best groups, based on their panicle characters and seed nutritional quality. Agro-morphological changes detected in this study, show that the majority of millet domesticated (MDH. Saf. P, MDH. Sepl) are generally, classified in second place and used as fodder in the Hoggar region.

关键词： Biodiversity Hoggar Morphology Panicle Pearl Millet

Optimization of Chromium (Vi) Removal by Donnan Dialysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2013年第6期4卷 306-313页

作者： I. Marzouk L. Dammak L. Chaabane B. Hamrouni 1UR traitement et dessalement des eaux Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisie Institut de Chimie et des Matériaux Paris-Est Université Paris-Est Créteil Henri Dunant Thiais France UR traitement et dessalement des eaux Faculté des Sciences de Tunis Université de Tunis El Manar Manar II Tunisie

The removal of chromium (VI) from aqueous solutions by Donnan dialysis has been investigated in this paper. In this process, two anion-exchange membranes (AEMs) were used: Selemion? AMV and Neosepta? AFN. The amount of chromium (VI) removed was determined in terms of the following parameters: initial concentration of chromium (VI), type of anion-exchange membrane, concentration of counter-ion and magnetic stirring rate. A 24 full factorial design analysis was performed to screen the parameters affecting the Cr (VI) removal efficiency. Using the experimental results, a linear mathematical model representing the influence of the different parameters as well as their interactions was obtained. Analysis of the variance (ANOVA), the F-test and the student’s test shows that the type of anion-exchange membrane is the most significant parameter affecting the chromium (VI) removal. The statistical analysis of the experimental data assumes it to be a normal distribution.

关键词： Donnan Dialysis Chromium (VI) Anion-Exchange Membrane Factorial design Optimization

Boron Removal by Electrocoagulation Using Full Factorial design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

作者： Khaoula Missaoui Wided Bouguerra Chiraz Hannachi Béchir Hamrouni UR11ES17 traitement et dessalement des eaux Faculté des Sciences de Tunis Université de Tunis El Manar Tunis Tunisie

Saline waters treatment has become increasingly important for drinking water supply in a greater part of the world. However, some serious limitations had recently been discovered during water treatment, among them the boron problem seems to have a critical meaning. According to the WHO regulations (2011), the boron concentration should be reduced to less than 2.4 mg/L for drinking water. The purpose of this study is to investigate the feasibility of electrocoagulation (EC) as a pretreatment process to remove boron from saline waters. To optimize the experimental conditions of boron 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). Subsequently, an experimental design methodology was implemented to evaluate statistically the most significant operating parameters. The effects of current density, EC time and initial boron concentration and their mutual interaction were investigated using 23 full factorial design. At optimal conditions, boron removal from synthetic aqueous solutions containing initial boron concentrations of 5 and 50 mg/L reached 81% and 79%, respectively. Applied to boron removal from seawater samples, EC reduces boron concentration to less to 2.4 mg/L with excessive energy consumption under optimal parameters.

关键词： Boron Removal Electrocoagulation Full Factorial design

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

作者： I. Marzouk L. Chaabane 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 benefit from each process, and it was an original and new combination. 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 Membrane Adsorption Activated Alumina