Chimie

Permanent URI for this collectionhttps://dspacee.univ-temouchent.edu.dz/handle/123456789/748

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Application des catalyseurs métalliques Dans la réaction Aza Micheal
(2025) FEKIRA, Faycal; BERRICHI, Amina
Elimination 2BE-NW par des sorbants naturels
(2025) Bensmail, Nesrine; BENGRINE, ASMA
This study examines the effectiveness of two natural biopolymers, chitin and chitosan, for the absorption of the textile dye Red Télon Lumière from an aqueous solution. The experimental analysis examines the impact of various elements such as the initial dye concentration, pH, contact duration, and also includes modeling using Freundlich and Langmuir isotherms. The data indicate that chitosan has a higher adsorption capacity than chitin, due to the amine groups that promote interactions with the dye. Chitosan thus proves to be a highly effective biosorbent for the purification of colored waters.
Élaboration et Application des Nanocomposites SBA-15/Pd Biosynthétisés
(2025) KEITA, Maïmouna Djiguiba; BOUSALEM, Smain
This thesis explores the biosynthesis of hybrid nanocomposites composed of mesoporous silica SBA-15 functionalized with palladium (Pd) nanoparticles, focusing on eco-friendly methods using plant extracts. The green synthesis of Pd nanoparticles is integrated into the SBA-15 matrix to obtain a composite material exhibiting homogeneous dispersion of nanoparticles and an ordered porous structure. The study highlights the role of biomolecules present in the plant extracts as reducing agents. These biomolecules reduce Pd ions into well-dispersed nanoparticles within the pores of SBA-15. This hybrid material demonstrates excellent catalytic activity and stability. It is particularly effective for the degradation of organic dyes in wastewater, offering a sustainable solution for pollution remediation. The SBA-15 support promotes the dispersion and reuse of Pd nanoparticles. These SBA-15/Pd nanocomposites show strong catalytic potential, especially for applications in the degradation of organic pollutants, thus providing a sustainable and efficient solution in the field of green catalysis, with promising large-scale industrial and environmental applications.
Etude de la biosorption des colorants textiles par la cellulose
(2025) MAAROUF, BOUCHRA; BENGRINE, Asma
Wastewater pollution by dyes is one of the major problems that needs to be addressed. Only industrialized countries use many conventional methods to remove dyes from wastewater. In this thesis, we focus on the absorption process of textile dyes. The treatment is carried out using a biologically absorbent material, in this case cellulose. We analyze the effect of various operational parameters on the amount of absorption, including contact time, initial formulation concentration, and solution pH.
Développement et évaluation d’un nouveau compostorganique
(2025) Benziane, Ikram; Kibou, Zahira
This study focuses on the development of an innovative bio-polymerized organic fertilizer derived from organic waste, aiming to promote sustainable and eco-friendly agricultural practices. The primary objective is to explore and demonstrate the potential of nitrogen-rich organic waste as an underutilized resource for producing high-quality organic fertilizer. By incorporating a biopolymer, the project seeks to create a slow-release, high-performance productthatenhancessoilfertilityandsupportshealthycropgrowth.Thisresearchcontributes to advancing circular economy principles in agriculture by transforming organic waste into a valuable, environmentally beneficial input.
GREEN SYNTHESIS OF Pd-MCM41 NANOCMPOSITE FOR ENVIRONMENTAL APPLICATION
(2025) SENNIA, AICHA; BELJILLALI, MOHAMED
The photocatalytic degradation of methylene blue (MB) was studied using Pd-MCM-41 nanocomposites as an efficient photocatalyst. Palladium nanoparticles were embedded in the MCM-41 structure to improve photocatalytic performance. The activity was tested under both UV and visible light. Parameters such as light intensity, dye concentration, and catalyst dose were optimized. The degradation efficiency was tracked over several cycles to assess stability and reusability. Pd-MCM-41 showed superior performance compared to conventional photocatalysts. These results highlight its potential for wastewater treatment and the removal of organic pollutants.
Préparation et évaluation d'hydrogel à base de chitosane/PVA Films chargés en nanoparticules pour des applications biomédicales
(2025) CHATIBI, Dhehbiya; CHAIBI, Wahiba
In this work, we prepared and evaluated hydrogel films based on chitosan (CN) and polyvinyl alcohol (PVA), incorporating silver nanoparticles (AgNPs) for biomedical applications. The nanoparticles were synthesized using a green method with plant extract, and incorporated into the hydrogel either by direct addition or via in situ synthesis. The films were analyzed through swelling tests over time and at different pH levels, and by antibacterial activities, as well as structural (FTIR) and thermal (DSC) characterizations. The results showed that a low concentration of AgNPs improved the swelling and stability of the films, while higher concentrations reduced these properties.
Préparation du lait végétal à partir de plantes médicinales (MILKCERAZI)
(2025) KHELLADI, Sid ahmed; BOUKAMBOUCHE, Abderrahmane; FEKIH, Nadia
This thesis focuses on the development of a functional plant-based beverage made from sesame seeds and enriched with two medicinal plants: carob (Ceratonia siliqua) and jujube (Ziziphus lotus). The main objective of this study is to valorize the nutritional and therapeutic properties of these plants by formulating lactose-free alternative milk, rich in proteins, fibers, and antioxidants. The preparation process includes soaking, grinding, and filtering sesame seeds, followed by the addition of carob pulp and jujube fruit extracts. Physicochemical (pH, Brix, protein and fat content, etc.) and microbiological analyses were conducted to assess the quality and stability of the final product. A sensory evaluation was also carried out to assess consumer acceptance. The results show that enrichment with carob and jujube significantly enhances the nutritional value and antioxidant properties of the beverage, while providing a naturally sweet and pleasant taste. This plant-based milk could therefore serve as a healthy and functional alternative to animal milk, particularly for lactose- intolerant individuals or those seeking health-promoting plant products.
Extraction de l’alginate à partir des algues et formulations du polymère en vue de son utilisation dans le domaine médicale
(2025) MEDJAJI, Intissar; BENNABI, Lamia
In this study, a therapeutic emulgel was formulated using alginate extracted from the brown seaweed Dictyota dichotoma. The main objective was to evaluate the potential of this alginate as a natural gelling agent in a topical formulation with anti-inflammatory and antimicrobial properties. The extracted alginate was characterized using various analytical techniques. Infrared spectroscopy (IR) confirmed the presence of the functional groups typical of alginate. Differential scanning calorimetry (DSC) showed good polymer stability, while X-ray diffraction (XRD) revealed a crystalline structure with calcite crystals present.The formulated emulgel, named Algaflam, was evaluated for its in vivo anti-inflammatory and antimicrobial activities. Another formulation, the reparative ointment AGANAT, based on essential oils of Figel and rosemary (Romarion), was also tested. AGANAT was found to be non-irritating and caused no redness. Both formulations showed highly promising results compared to the controls. Rheological analysis indicated that the product exhibits pseudoplastic shear-thinning behavior, which is favorable for topical application, in addition to a stable and pleasant texture. When compared to an emulgel of similar composition made with commercial alginate, the results suggest that alginate extracted from Dictyota dichotoma is a valuable biomolecule for pharmaceutical applications, especially in topical delivery systems.
Development of new pharmaceutical forms for oral administration followed by microbial study
(2025) RAHOU, Khouloud; SEDIRI, Khaldia
This study aimed to develop and evaluate amoxicillin-loaded tablets using ethylcellulose (EC) and hydroxypropyl methylcellulose (HPMC) as matrix polymers. Three formulations were prepared: T1 and T2 using EC with different AMX ratios, and T3 combining EC, HPMC, and AMX. Characterization by FTIR and XRD confirmed the presence and dispersion of AMX in the polymer matrices. Drug release studies in acidic (pH 1.2) and basic (pH 7.4) media showed higher release in acidic conditions for all formulations, especially T1 and T2, making them suitable for stomach-targeted delivery. T3, containing HPMC, showed slower and more controlled release due to its gel-forming properties. Liquid absorption tests showed T3 absorbed significantly more water due to HPMC’s hydrophilic nature, contributing to sustained drug release. Antibacterial tests demonstrated that the release behavior directly influenced antimicrobial activity. Faster release in acidic conditions led to earlier and stronger bacterial inhibition, particularly in T2. These results validate the pH-sensitive design and highlight the potential of these formulations for targeted, effective drug delivery in gastric environments.
Synthèse et application du polyacrylate de sodium dans les formulations cosmétiques : Etude de la rétention d’eau et effet de texture
(2025) SOHBI, ZOUAOUIA; CHAIBI, Wahiba
This work aimed to design hydrogel materials based on acrylic acid (AAc) and acrylamide (AAm) through chemical crosslinking using potassium persulfate and N,N′- methylenebisacrylamide (Bis-acrylamide) as the crosslinking agent. Hydrogels based on acrylic acid (AA) were also prepared via physical crosslinking in the presence of CaCl2. Subsequently, a PAAc/TiO2 composite was synthesized to investigate its antimicrobial properties. The obtained hydrogels were characterized using Fourier-transform infrared spectroscopy (FTIR). The analysis revealed that the swelling capacity depends on the concentration of AAc, pH, and temperature. The application of the PAAc/TiO2 composite in antimicrobial activity was carried out to assess its effectiveness against different bacterial strains, highlighting the synergistic effect between the polymer and the metal oxide in inhibiting microbial growth.
Extraction and characterization of biopolymer and study its effect in drug release
(2025) BENALI, Hosna; SEDIRI, Khaldia
In this work we are interested by extracting Cellulose from a plant source as Alfa plant “Stipa Tenacissima” and from waste of paper. After Extraction, the cellulose extracted was modified to obtain “Cellulose Triacetate CTA” using esterfication process. The cellulose and CTA were characterized by FTIR and DRX. For using our polymer CTA prepared as a polymeric matrice in pharmaceutical formulations, we introduced it to prepare two different discs charged with an antibiotic agent “Cefalexin” and study its release in physiological medium. P1 and P2 were tested microbial with 4 pathogens. The results showed The IR spectrums of both cellulose extracted from Alfa plant P1 and from wastepaper P2 indicates the presence of major characteristic absorption bands of cellulose compared with the spectrum of pure cellulose. The IR results show that the tablet has good correlation between Cefalexin and CTA and the CF was dispersed on the polymer matrix CTA. The main absorption bands of CF which appear clearly in the disk spectrum. The diffractogram XRD of P1 clearly shows that the polymer is semi crystalline polymer. The XRD pattern of CTA modified from P1 shows the amorphous structure. The results of release of CF from two tablets containing cellulose triacetate (CTA) was significantly different depending on the drug load. From microbial test, We observe that the polymer has a good inhibition zones with all strains tasted with different diameters, for Cellulose extracted from Alfa plant (P1) , the highest inhibition zone was observed with staph strain with diameter 11 mm. we obtained also for the cellulose extracted from wastepaper (P2), the highest inhibition zones was observed with Pseudomonas and candida albican with 7mm.
Biosynthèse et Application des Nano-composites d’Oxyde de Nickel (NiO)
(2021) DJEBBOUR, Taqiy Eddine; BENOUALI, Mohamed Amine
SYNTHESIS OF METALLIC NANOPARTICLES USING PLANT LEAF EXTRACT
(2023) KUKULA, Paul; BELDJILLALI, MOHAMMED
Interest in the biosynthesis of silver nanoparticles (AgNPs) has been steadily increasing primarily due to their numerous applications in various fields, low cost, use of non-toxic environmentally-friendly materials and easy implementation. This study focused on the biosynthesis of AgNPs using unknown plant leaf extract, optimization of process conditions, and application in catalytic reduction of methylene blue dye to leucomethylene blue (colourless). AgNPs were synthesised by using silver nitrate as the precursor and plant leaf extract as a reducing and capping agent due to presence of phytochemicals (biomolecules) present like flavonoids, phenols, alkaloids, terpenoids, amides, aldehydes, carboxylic acid, and ketones and they were characterised using a uv visible spectrophotometer. A silver nanocomposite was synthesized using an unknown support, silver nitrate solution, ultra distilled water and the plant leaf extract. The silver nanocomposite was then applied in catalytic reduction of MB to LCMB with parameters; mass of the Ag-nano composite, concentration of sodium borohydride and concentration of MB were put into consideration. A time dependent uv vis spectrophotometer analysis for the catalytic degradation of MB dye by the biosynthesized Ag-nanocomposite for 5min indicated the maximum influence of nanocomposite. The MB dye was reduced rapidly with NaBH4 in the presence of Ag-nanocomposite due to their catalytic action. The findings of the study show the potential of unknown plant leaf extract for the biosynthesis of AgNPs with excellent catalytic activity of their nanocomposites for the reduction of MB dye to LCMB.
Peinture antibactérienne protection et santé pour vos surfaces
(2023) HASSNI, Fatima Zahra; AISSA KORIDAK, Welid; BAILICHE, Zohra
Synthèse et caractérisation des nanocapsules de chitosan
(2023) HADJRI, Soumia; SOUIDI, Chaima; BERRICHI, Amina
Encapsulation plays an important role in protecting the properties of the different compounds, the polymers seem to be the most suitable for this function, the objective of this study is to experiment with chitosan as a coating. All nanocapsules obtained were characterized by three methods; infrared analysis (FTIR), UV-visible and scanning electron microscopy coupled with elemental analysis (SEM-EDX) in order to confirm that the encapsulation of the products cited by the selected biopolymer has taken place The results obtained by the analyses in the case of the natural product showed that there were interactions between the compound and the surrounding material, as well as the presence of the encapsulated compound in the structure of the chitosan. However, the case of copper-based nanostructure shows a greater abundance compared to chitosan,
Recyclage des pneus et transformation au « rubber floor »
(2023) Hadj Bouazza, Khaled; Bendahmen, Mohamed Yassine; BELDJILLALI, Mohammed
The main objective of our study is to examine the possibility of mixing coffee waste with recycled rubber in order to manufacture a rubber floor. The studied material is a rubber floor for which we increased the coffee waste in different quantities 5%, 10%, 20%. A series of tests including compressive strength, thermal conductivity and sound insulation were carried out The results of the tests showed that adding 5% of coffee waste is the appropriate amount not to affect the properties of rubber such as the speed of ultrasonic wave propagation, the ability to absorb shocks, and heat resistance.
Etude Extraction des huiles essentielles par différents méthodes
(2023) ELABED, Wassim; SOUIDI, Youcef; BENYETTOU, Fatma
The interest of this research is the recovery of lemon dregs to extract essential oil to address the oxidation of waste water which poses an environmental problem. The research work was carried out in laboratory N ° 5 in the department of S.M university ain tmouchent on the theme "Extraction of essential oils by different methods" This theme to start several accepts: • Extraction of essential oils by different methods. • Develop a new microwave method. • Valorization of lemon dregs (peel and grain). We studied several factors Yield, Density, CCM, pH on different compounds of following essential oils: Garlic, Lemon peel, Lemon seed, Rosemary, Mint, Rose, Almond. The various analyzes carried out on the extracts, starting with the analysis by thin layer chromatography (TLC) of the essential oils, show that identified compounds are present among these reference compounds as it is the main molecule of these oils. essential. The acid potential values of the oil extracts are acid in the pH range 4-6 as well as the relative densities between 0.009 and 0.016. These values meet the criteria of good quality essential oils according to AFNOR standards.
Synthèse et application des nanocomposites pour la dégradation des polluants
(2023) Daoudi Oussama, Abdel kader; Kambouz, Nasreddinne; RAMDANI, Nassima; BOUSALEM, Smain
In this study, zinc oxide nanoparticles in powder form were obtained by green synthesis using the natural extract of water mint leaves. First, the absorption of par in the 380 nm region was studied. shows the good crystalline quality of the product with very well defined peaks on the (002), (100) and (101) planes indexed as a hexagonal structure. The showed that synthetic nanoparticles. In a second time the evaluation of these synthesized powder is done by photocatalytic and antibacterial tests, the results obtained are good. As a result, the use of water mint leaf extract offers a low-cost and environmentally friendly nanoparticle synthesis process
Préparation des Peintures Eco-friendly/ NatPaint
(2023) BENADDA, SELMA; KIBOU, Zahira
A new formulation of eco-friendly paints (Gouache) based on natural biosource of plant origin has been developed. The process of preparation of this ecological paint goes through stages ; we start the mixture by incorporating the components at once then we pass the dispersion of viscous mixture under Ultrasound, at the end everything and heat until boiling. After cooling the paint (Gouache) is obtained according to the desired colour. This process can be applied to many colours and can be useful to replace conventional processes. The use of natural products is an intelligent choice as it is good for the health of the human being and the protection of the environment

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