Journal Articles
Permanent URI for this collectionhttps://dspace.univ-soukahras.dz/handle/123456789/240
Browse
9 results
Search Results
Item ECO-EXTRACTION PROCESS OF ESSENTIAL OIL OF THE VEGETAL SPECIES EUCALYPTUS CAMALDULENSIS DEHNH.: PARAMETRIC MODELING AND OPTIMIZATION BY BOX-BEHNKEN PLAN(Editura Academiei Romane/Publishing House of the Romanian Academy, 2023-10-23) ABIDI Abdenabi ,a,b,* ,a ,c d and; DJERMANE Mohamed; IEZID Mostepha; GHERRAF Noureddine; PONTIE MaximeThis study was aimed to implement response surface methodology to optimize the hydrodistillation parameters of the essential oil of the plant species Eucalyptus camaldulensis (RSM). The distillation time, condensation flow rate, and particle size were the desired parameters. To generate factor combinations, a three-factor Box-Behnken design was used. The response surface analysis yielded a linear model, which was used to calculate the top yield of extracted oil based on the optimized conditions. ANOVA shows that the generated polynomial model was highly noteworthy, with R2=0.861. The peak yield was 0.513663% at the optimal conditions, which were 1 mm as particle size, 3.4 mL/min as condensation flow rate, and 210 min as extraction time. The GC/MS analysis revealed the presence of p-cymene (26.22%), spathulenol (16.71%), and 1.8-cineole (14.44%) as major components.Item Chemical Composition and Antibacterial Activity of Algerian Launaea nudicaulis Essential oils(International Scientific Organization, 2020) FADJKHI Narjes , ,; HAMEURLAINE Samir; Fellaha Ouroud; DJERMANE Mohamed et alThe chemical analyses of Launaea nudicaulis essential oils by GC/MS allowed the identification of 94.1% of the crude oil affording 50 volatile compounds. The major components are: β-caryophyllene 7.9%, (E)-β-farnesene 7.6%, β-selinene 9.9%, Spathulenol 4.9%, α-cadinol 5.9%, haxadecanoic acid 17.3%. The IC50 of their scavenging activity is found to be 1.94 mg/mL. Moreover, the extract reveals a average in vitro antimicrobial activity on some strains, confirmed by the inhibition zone diameter ranging from 6 to 14.5 mm depending on the microorganism being tested.Item Study of the influence of operational parameters on the adsorption of a dye by a potato peels(Book Springer, Volume 1 Nanotechnology and advanced Materials, 2020-10-25) Saliha Bouranene; Souheila Bouacherine; Nora SediraThe growing demand for adsorbent materials for environmental protection processes is prompting further research in the manufacture of unconventional and low cost adsorbents. In this work we have prepared a material from a natural waste namely potato peels to clean up contaminated water with a cationic dye i.e. Methylene Blue (MB). Firstly a characterization of the material was carried out in terms of bulk density, ash content, moisture content, pH and electrical conductivity. A parametric study was carried out subsequently and revealed that this adsorbent gives a better adsorption efficiency with respect to BM molecules (Tx = 95.13%) during a contact time of 45 min for a solid mass (4 g), a speed stirring (150 rpm), a solid mass/liquid volume ratio (4 g/250 mL) and an initial dye concentration (10 ppm). The modeling of the adsorption results gave an L-type isotherm with good compatibility with the Langmuir and Freundlich models.Item Kinetic Study of the Adsorption of Zinc and Copper Ions on to Activated Carbon Prepared from Date Pits(International Journal of New Chemistry, 2021-11-08) Saliha Bouranene; Nora Sedira; Lotfi Zeghadnia; Abde El Krim GuebailIn the present work, an activated carbon material has been prepared from date pits to remove zinc (Zn2+) and copper (Cu2+) from a wastewater. The effect of some parameters on adsorption performance has been investigated. The optimization of operational conditions allowed increasing the adsorption of Zn2+ ions from 33% to 85% and the adsorption of Cu2+ from 23% to 70%. The optimum conditions found are a mass of adsorbent of 4g, a stirring speed of 500 rpm and a ratio of 15 for volume of liquid / mass of solid. It has been shown that the adsorbent has more affinity to the copper ions than zinc ions and the modeling results gave adsorption isotherms type “C”. The results also showed that the kinetics of zinc and copper ions adsorption were described by a pseudo second-order rate model and controlled by the internal diffusion which can be considered as limiting step that controls the rate transfer of these ions to the solid surface.Item Ultrasound-assisted adsorption of Pb ions by carbonized/activated date stones from singles/mixed aqueous solutions(Journal of the Indian Chemical Society, 2022-01) Nora Sedira; Saliha Bouranene; Abdalhak GheidThis work aims to assess the adsorption efficiency of date stones biowaste subjected to carbonization and activation processes for the removal of Pb ions from single and mixed solutions. Several techniques have been used for characterization of adsorbents such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), methylene blue index and point of zero charge (pHpzc). An excellent adsorption capacity of 97.43% is achieved at an initial concentration of 300 mg/L, solution volume 75 mL of Pb nitrate, adsorbent mass of 0.7 g, temperature of 30 °C, a stirring speed of 500 rpm/min, a contact time of 180 min and pH 6. Specifically, a comparison has been conducted between carbonized/activated date stones “CADS” and commercial activated carbon “CAC” besides investigating the influence of the presence of Co ions and the utilization of ultrasound radiation. A higher adsorption rate of 98.16% is reached under ultrasound radiation at Pb(II) initial concentration of 100 mg/L for a contact time of 3 h. Nevertheless, the temperature has shown a negative effect; the adsorption rate decreases from 98.31% at 18 °C to 92.70% at 60 °C. The modeling of the experimental adsorption data manifests a type-L isotherm characteristic of Langmuir and Freundlich models. The kinetic study has shown that the experimental data are well described by a pseudo-second-order rate model and controlled by the internal diffusion, a limiting-step that controls the transfer rate of Pb(II) to the adsorbent surface. The calculated thermodynamic parameters (ΔG⁰, ΔH⁰, ΔS⁰) indicate that the adsorption of Pb(II) is spontaneous and exothermic process.Item Determination of the microbiological characteristics and traces of heavy metals in rainwater harvested in urbanized areas to develop their uses: Case study of downtown Souk Ahras, Algeria(Genetics & Biodiversity Journal, 2023-01-08) Guebail, Abdelkrim; Boukhari, Sofiane; Zeghadnia, Lotfi; Ahmed Salah, Araibia; Bouranene, SalihaRainwater storage tanks designed with diverse materials may host sustainable microbial systems; such systems are found in areas where a potable water source is not readily available. The variations in the water stored can also affect the levels of heavy metals and the physic-chemical parameters. The types of tanks and their composite materials can significantly influence the values of some chemical elements, especially heavy metals, essential nutrients, as well as pH, EC, and turbidity. In this study, two types of tank materials were used for the harvested rainwater systems in Souk Ahras city: concrete and plastic. Twenty-one samples were collected and analyzed for different time scales for both types of tank materials: one week, three weeks, and three months. Results of the determination of the essential nutrients as well as the concentrations of heavy metals, such as lead (Pb), copper (Cu), nickel (Ni), chromium (Cr), iron (Fe), cadmium (Cd), and arsenic (As), were present in moderate concentrations. In addition, pathogens, such as salmonella, yeast, mold spores, fecal coliforms, and streptococci, were undetected in the rainwater samples of all tanks. However, the concrete tanks showed a very interesting resistance to the growth of aerobic germs, where 99.7% of the germs were eliminated by the third week. However, the opposite behavior was recorded after this period.Item Corrosion properties of ceria-based coating electrodeposited from alkaline bath on electrogalvanized steel(Journal of Applied Electrochemistry, 2021) Rouabhia, F; Hamlaoui, Y; Meroufel, A; Pedraza, FLong-term protectiveness of zinc coatings remains challenging where conversion surface pre-treatments are suggested such as the promising cerium oxide-based coatings. In the present work, the efect of acetic acid addition and of temperature of the bath on the ceria-based coatings produced by cathodic electrodeposition on electrogalvanized steel are investigated. The electrochemical, surface chemistry, and topographical properties are characterized and their corrosion performance is evalu ated in NaCl solution. The results show that the coatings prepared from equimolar mixture of cerium chloride and acetic acid at pH 8 and room temperature were less cracked, had a smaller grain size, and ofered a three-fold increase of the corrosion resistance when compared with those prepared in cerium chloride solution at pH 6. From X-ray difraction patterns, it seems that the deposits obtained at pH 8 are free from corrosion products. Moreover, the porosity of the coatings obtained at pH 8 increases with increasing the bath temperatures indicating that at high bath temperature the deposits become heterogeneous and do not cover the whole surface of the substrateItem Electrochemical investigation of ceria nanoparticles as a corrosion inhibitor for steel in alkaline medium(2023) Bourenane, N; Hamlaoui, Y; Pedraza, FThis work investigates the synthesis and the corrosion inhibitor efficiency ceria nanoparticles may exert on steel reinforcement in an alkaline solution of saturated Ca(OH)2 + 0.5 M CaCl2 up to 50°C. The corrosion mechanisms are thoroughly investigated by electrochemical and various characterization techniques. The electrochemical results show that ceria nanoparticles act as an anodic inhibitor and provide maximum inhibition efficiency (80%) at a concentration of 800 ppm. The resulting surface is smooth and free from corrosion products due to the formation of a physically adsorbed film according to the thermodynamic calculations.Item Corrosion protection mechanism of Ce3+/polyethylene glycol systems inhibitors for mild steel in sulfate solution(Materials and corrosion, 2023) boudellioua, H; Hamlaoui, Y; Pedraza, FIn the present paper, cerium nitrate salt was used as a green inhibitor to improve the corrosion resistance of mild steel in 0.1 M Na2SO4 solution. To increase the barrier effect and film stability of the protective layer, polyethylene glycol (PEG) was added. The corrosion tests were evaluated using d.c polarization techniques and electrochemical impedance spectros copy. The composition and morphology of the sample surface were characterized using Raman spectroscopy and MEB/EDS analysis. The resultsshow that the presence of PEG improved relatively the corrosion resistance of mild steel due to the removal of cracks, the pores blocking the formed film and the enhancement of adhesion and compactness of the cerium‐based film. Consequently, the protective film became more coherent on the steel surface. Furthermore, the potentiodynamic polarization indicated that the Ce3+/PEG system behaved as a mixed‐type inhibitor with the dominant effect of the cathodic part.