Browsing by Author "Zibouche, Fatima"

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Adsorption of yellow bemacid CM-3R dye from aqueous solutions onto raw and sodium bentonite
(2012) Ouslimani, Nassira; Zibouche, Fatima; Iratni, A.; Abadlia, Mohamed Tahar
Discharges from the textile industries are heavily loaded with various dyes which requires their treatment. The most common method is to adsorb on solids high surface area, for example, clay material highly available and whose leaves are good natural adsorbents. In present study we used a local bentonite available in its natural form and sodium form for the adsorption of a dye CM-3R yellow bemacid provided by BEZEMA. The evaluation of the effect of various variables is driven by a series of experiments as the contact time, initial concentration of the dye, the initial pH. The different parameters show that the adsorption of the dye is favoured to 240 min, pH 2 and a temperature of 19 ºC. The sodium bentonite yielded good performance results due to the improvement of its adsorption properties. The best correlation of experimental results are obtained with the Langmuir model for sodium bentonite (R % = 0.998) and Freundlich for the raw bentonite (0997)
Approche globale et approche ciblée dans la gestion des effluents hospitaliers : application centre de transfusion sanguine, laboratoire sérologie, CHU de Blida
(2012) Bouzid, Mohammed; Djadi, A.; Guechtoulli, S.; Zibouche, Fatima; Halouane, F.
Des études récentes révèlent un danger certain lié aux résidus médicamenteux, produits chimiques, radionucléides, bio films, bactéries résistantes et virus, en aval des stations d’épuration (STEP). Ces résultats confirment l'existence de substances dangereuses dans les effluents hospitalières. Le Centre hospitalo-universitaire Frantz Fanon de Blida s’étale sur superficie de 35 Hectares, d'une capacité globale de 1613 lits, se situe en un point sensible de la Mitidja, Cette plaine s’étend sur une superficie de 1450 km2, d’une épaisseur de 100 à 150 m avec 5 millions habitants. Les potentialités en eau souterraine de cette nappe sont 328 millions m3/an. La production de solutions nuisibles par le C.H.U est estimée à 100 litre par lit et par jour, les rejets peuvent contaminés les eaux de surfaces (Oued Sidi El Kebir, Oued Mazafran) et les eaux souterraines via l’infiltration et la nature perméable des sols. Il est à craindre que les courants souterrains contaminent à long terme une grande partie du sous-sol de la Mitidja. Devant l'urgence et le risque qu'ils représentent, nous avons développé une approche dite ciblée pour une gestion plus efficace des effluents hospitaliers. En effet, dans l’approche globale les effluents hospitaliers sont collectés par un réseau d'assainissement, traités dans une station d'épuration avant d'être rendus dans le mitan naturel. L’approche ciblée évite les rejets dans le réseau d’assainissement de l’hôpital et la STEP, elle neutralise la pollution chimique et biologique à la sortie de chaque enceinte. Par ailleurs, la réalisation d’un laveur désinfecteur d’endoscope adapté à la spécificité des protocoles (exploration digestive, bronchique…) représente une application de l’approche ciblée. En effet, La gestion de la solution désinfectante par asservissement électrotechnique en circuit fermé permet la maitrise de la pollution biologique (ΣBi) et chimique (ΣCi). Il parait que l’évolution des sciences médicales s’accompagne de nouveaux soucis, en plus de la pollution biologique bactérienne et virale en parle aujourd’hui des protéines pathogènes et résistantes au procédés de désinfection usuels. L’approche ciblée reste de mise et insiste sur le développement et l’adaptation de nouvelle technologie dans la procédure de désinfection
Effect of Black Liquor from Date Palm on the Workability and Compressive Strength of Portland Cement and Concrete
(De Gruyter Open Sp. z o.o., 2019) Irekti, Amar; Oualit, M.; Siahmed, H.; Buncianu, D.; Zibouche, Fatima
Lignin is the second most abundant natural polymer. Due to the high content of carbon and hydrogen (C-H, C-C, C=O), it can be used as a potential dispersant for cement matrix. The objective of this study is to extract lignin from date palm and study its effect in the form of black liquor (BL) on the rheological and physic-mechanical properties of the cements and concrete. The lignin in black liquor form represents approximately 30 wt% dry weight of date palm. It is a heteropolymer composed primarily of methoxylated phenylpropylene alcohol monomeric units interconnected by a variety of stable carbon-carbon and carbon-oxygen-carbon (ether and esters) linkages. The results found show the positive effect on the workability of cement and concrete and confirms its dispersion effect by improving compressive strength of concrete during the early and the later ages of hydration.
Effect of the iron concentration on the properties of an aluminosilicate glass used for storage of radioactive waste
(PARLAR SCIENTIFIC PUBLICATIONS (PSP), 2016) Moudir, D.; Ikhaddalene, Soumia; Kamel, N.; Benmounah, A.; Zibouche, Fatima; Mouheb, Y.; Aouchiche, F.
Etude expérimentale du comportement diélectrique et thermique des nano composites hybrides à matrice époxyde chargée
(2014) Irekti, Amar; Bezzazi, Boudjema; Aribi, Chouaib; Zibouche, Fatima
FTIR analysis and thermal behavior Of microcomposite Pozzolan/ Dgeba
(2019) Irekti, Amar; Oualit, Mehena; Zibouche, Fatima; Buncianu, Dorel
In the present study six blends of Diglycidyl ether of bisphenol-A and pozzoan filler were synthesized by physical mixing at 100°C. Interaction among epoxide group of DGEBA, composition of fillers and anhydride group of curing agent discussed through FT-IR analysis. The TGA studies revealed a increase in thermal stability and the glass transition temperature (Tg). The integral procedure decomposition temperature increased from 571,3 °C to 617,9,3°C. The composites had a higher glass transition temperature than the neat epoxy resin. The coefficient of thermal expansion of the composites at the glassy and rubbery regions decreased with increasing ﬁller content. Scanning electron microscopy (SEM) indicated the presence of two-phase morphology in the blends
Géopolymérisation d’aluminosilicates. Influence des rapports Silice/Alumine
(University M'Hamed Bougara Boumerdes, 2013) Zibouche, Fatima; Boudissa, N.; Irekti, A.; Abadlia, Mohamed Tahar
La géopolymérisation étudiée repose sur la polycondensation de précurseurs solides silicoalumineux, (métakaolin) dans un environnement fortement alcalin. Des échantillons géopolymères Na-poly-sialate avec des rapports molaires différents de Si/Al, Na2O/Al2O3, H2O/Na2O sont préparés, pour suivre leur influence sur la polymérisation et la microstructure. Lors de la géopolymérisation, les solutions alcalines induisent une quantité d'atomes de Si et d'Al de l'aluminosilicate, forment des « geomonomers » dans les solutions pour former des réseaux rigides. Les résultats dans gamme des rapports étudiée donnent des résultats proches de ceux attendus. Ils indiquent une degré élevé de géopolymérisation. L’augmentation Si/Al, montre un recouvrement par un réseau continu de plus en plus dense, ce qui est confirmé par la résistance à la compression. Les résultats sont corrélés en privilégiant une approche multi-échelle du comportement du matériau par différentes techniques complémentaires (DRX, FTIR, MEB), caractérisant la microstructure
Geopolymers from Algerian metakaolin. Influence of secondary minerals
(2009) Zibouche, Fatima; Kerdjoudj, H.; Lacaillerie, J.B.E.
The influence of secondary phases (illite, quartz) on the geopolymerization reaction of metakaolin has been investigated by comparing two metakaolins, one prepared from a pure kaolinite and the other from illite- and quartz-containing Algerian kaolin from the Tamazert region, respectively. Geopolymerization was achieved by mixing the metakaolins with an alkaline sodium silicate solution at room temperature and curing at 50 °C. The products were characterized by X-ray diffraction and 29Si and 27Al MAS-NMR. The results show that the secondary phases, at the concentration used in this work, do not prevent the geopolymerization reaction
Hybrid Cements From Metakaolin, Slag And Clinker Mixtures. Influence Of Activators
(Université M'hamed Bougara de Boumerdès, 2013) Zibouche, Fatima; Ferna´ndez- Jime´nez, A.; Boudissa, N.; Palomo, A.; Abadlia, Mohamed Tahar
Hybrid cements containing a mixture of aluminates gels-substituted CSH (CASH) and NASH phases and other phases are investigated. The mechanical strength and structures of hybrid cement with geopolymeric matrix of aluminosilicates and clinker are examined. These geopolymeric matrixes are based on polycondensation of the powder precursors by alkaline activation. The activators can be solids (alkalis of sulfates and carbonates,) or liquid (alkaline solutions of silicates). The type of alkaline cation (Na, K) influences the activation. The phase’s transformations are characterised by the following parameters: the effect of cures (2, 7, 28 days) and their impact on the hardening, the texture and the mechanical strength. These properties are correlated by complementary techniques of DRX, FTIR, SEM / EDX. Alkaline potassium K more than the sodium Na allows the obtaining of products of denser reactions what increases the strength of cohesion of the matrix and show higher mechanical resistances.
Kaolinite-Magnesite or Kaolinite–Talc-Based Ceramics. Part II: Microstructure and the Final Properties Related Sintered Tapes
(MDPI, 2020) Hammas, Aghiles; Lecomte-Nana, Gisèle; Daou, Imane; Tessier-Doyen, Nicolas; Peyratout, Claire; Zibouche, Fatima
In recent decades, talc and kaolinite have been widely used as raw materials for the ceramic industry. In this study, the final characteristics of kaolinitic clay mixed with 6 mass% of magnesite obtained in our previous work were compared with those obtained with mixtures of kaolin (kaolin BIP) and talc (as the source of magnesium oxide). However, different amounts of talc in the kaolin powder were studied, namely 10, 30, and 50 mass% of added talc (with respect to kaolin + talc). The tape casting process was used during this work in order to manufacture the green tapes in an aqueous system with 0.2 mass% of dispersant. Subsequently, the green tapes were heated to 1000 and 1100 °C with a dwelling time of 12 min. The green and sintering tapes were characterized using the following techniques: DTA/TG, X-ray diffraction, porosity, and flexural strength analyses. The results obtained from our previous work indicate that the specimen with 6 mass% of MgCO3 sintered at 1200 °C for 3 h exhibited the best performances, with high flexural strength and weak porosity value—117 MPa and 27%—respectively. As results from this study, the optimal mechanical and thermal properties of sintering tapes were obtained for the specimen with 10 mass% of added talc sintered at 1100 °C. Indeed, this specimen exhibited 50 MPa and 43% of stress to rupture and apparent porosity, respectively
Metakaolin-slag-clinker blends.the role of Na+ or K+ as alkaline activators of theses ternary blends
(Wiley Periodicals, 2013) Fernández-Jiménez, Ana; Zibouche, Fatima; Boudissa, Nassima; García-Lodeiro, Ines; Abadlia, Mohamed Tahar; Palomo, Angel
The role of aluminium in alkali-activated bentonites
(Springer, 2015) Garcia-Lodeiro, I.; Cherfa, N.; Zibouche, Fatima; Fernandez-Jimenez, A.; Palomo, A.
Sintering and final properties of kaolinite-magnesite tapes for the manufacture of cordierite-mullite ceramics
(Blackwell Publishing, 2020) Hammas, Aghiles; Lecomte-Nana, G.; Daou, Imane; Zibouche, Fatima
The present work aims at studying the effect of the sintering temperature and magnesite addition on the structure and final properties of silicate ceramics tapes. A kaolinitic clay from Algeria was selected and mixed with different magnesite contents (≤12 mass%). Tape casting process was used to produce the green tapes in an aqueous system with optimized amount of surfactants. The green tapes were fired from 1000°C to 1200°C using a dwelling time of 30 minutes. The effect of the dwelling time was investigated for a firing temperature of 1200°C namely: 30 minutes, 1 hour 30 minutes and 3 hours for samples with 6 and 12 mass% of magnesite. Regarding firing conditions, crystalline phases, thermal conductivity, porosity, and flexural strength were analyzed. The results showed that increasing the sintering temperature to 1200°C tended to significantly decrease the total porosity of samples, which led to the improvement of the stress to rupture values. Specimens with 6 and 12 mass% sintered during 3 hours exhibited highest stress to rupture values (≈117 MPa) and lowest thermal conductivity (<0.2 W.m−1.K−1) and moderate open porosity (27%). The as-obtained ceramics appeared promising for further utilization in refractory industry, thanks to the presence of both cordierite and mullite phases
Structural characterization of mullite formed from heated kaolin of tamazert deposit (Algeria)
(2012) Zibouche, Fatima; Kerdjoudj, H.; Abadlia, Mohamed Tahar
A quantitative analysis of the mullite phase obtained after sintering of the kaolin has been performed by treatment of X ray diagrams. Kaolin is treated in the range of 950-1400 *deg;C. The oxide NiO is added as internal standard after cooling to sintered sample kaolin. Bragg Brentano diffractometer, scanning electron microscopy and differential thermal analysis were used. Analyses of selected directions profile of mullite were carried out by using the adjustment of program, available in the software Highscore of Pan Analytical. The mullite phase that formed from kaolin appears at 1000 °C, observed by XRD and tallies with DTA. The primary mullite crystal showed a plate-like morphology. Two kinds of morphology corresponding to primary (elongated grains) and secondary (equiaxed grains) mullite were observed. A bimodal crystallite size distribution was detected through XRD microstructural analysis from 1300 °C. The apparent sizes obtained of crystallites are determined for mullite with directions-dependent (anisotropy)
Synthesis and rheological properties of magnetic chitosan hydrogel
(Budapest University of Technology and Economics, 2021) Ikhaddalene, Soumia; Zibouche, Fatima; Ponton, Alain; Irekti, Amar; Carn, Florent
The aim of the present work is first to synthesis a magnetic chitosan hydrogel (chitosan ferrogel) using the blending method and second to study it rheological behavior. Magnetic components ( maghemite particles γ-Fe 2 O ) were synthesized via a simple chemical co-precipitation route also called Massart's procedure. Before being dispersed in chitosan network, γ-Fe 3 2 O particles were covered with a cationic polyelectrolyte (Polydiallyldimethylammonium chloride; PDADMAC) and the exact quantity required to cover the entire surface of maghemite particles was determined by Electrophoretic mobility. The successful functionalization of maghemite particles was confirmed by zeta potential measurement. The prepared ferrogel was gelified using glyoxal as crosslinking agent. The effect of continuous magnetic field on rheological properties of the elaborated ferrogel was studied, under controlled temperature before and after the gelation process, using a rotating rheometer fitted with a new magneto-rheological cell. Moreover the influence of iron oxide content on the gelation time of magnetic hydrogel was studied by comparing two ferrogels with different maghemite particles content. Flow and viscoelastic measurements showed that applying magnetic field facilitates the formation of a new structure (columnlike arrangements), which was confirmed by in situ optical microscopic observation. Kinetic study was investigated by mechanical spectroscopy and demonstrates that the gelation time depends on both iron oxides content and magnetic field
Thermal behaviour of kaolin of tamazert (Algeria) deposit
(2012) Zibouche, Fatima; Kerdjoudj, H.; Abadlia, Mohamed Tahar
Kaolin from Tamazert deposit in the north Algeria was used in this study. The physical and chemical properties were determined by the performance of several analyses as well as the X-ray fluorescence, X-ray diffraction, thermal behaviour (ATD, TG), dilatometric and granulometric distribution. The study of ceramic behaviour as function of firing temperature has been investigated by shrinkage, adsorption both density and mechanical tests after gradually increasing from room temperature to 1500 °C. The modification of the structure of the raw material samples has been observed after fining and the crystallization of mullite and amorphous silica phase were confirmed by scanning microscopy SEM and evaluated by XRD. The suitability of kaolin for ceramics process was discussed from the linear shrinkage, both density and open porosity. The amorphous phase content is varied from 27-34 % and the tests of flexion have been carried out as depending of temperature, revealed a suitable mechanical properties and the relationship between amorphous phase and sample properties. The adsorption rate was found to be about 35%