Browsing by Author "Hamdi, Maamar"

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Citric acid removal from aqueous solutions using a polymer inclusion membrane based on a mixture of CTA and CA
(Taylor & Francis, 2018) Benosmane, Nadjib; Boutemeur, Baya; M Hamdi, Safouane; Hamdi, Maamar
Green synthesis, characterization, structure, biological activity, theoretical calculations and drug-likeness analysis of coumarins
(Elsevier, 2020) Khaldi-Khellafi, Nassima; Oukacha-Hikem, Djamila; Terrachet Bouaziz, Souhila; Abdoun, Amar; Makhloufi-Chebli, Malika; Dumas, Françoise; M.S. Silva, Artur; Hamdi, Maamar
Condensation of salicylaldehydes and 2-hydroxynaphthaldehyde with various β−dicarbonyl derivatives 2a-c , in the presence of KF-Al 2 O 3 , leads to the synthesis of a series of coumarins 3-8 and benzo[ f ]coumarins 10 respectively by a solvent free reaction under microwave irradiation. The catalyst is recovered by a simple filtration and reused in subsequent reactions. The structure of all synthesized compounds has been established by using analytical techniques such as IR, 1 H and 13 C NMR spectroscopic spectra and elemental analysis. Most of the coumarins exhibited significant antibacterial activity against S. aureus Gram-positive bacteria compared to Cefotaxime as positive control. The compounds 4a and 7a demonstrated moderate antimicrobial activity against compound 8a is extremely sensitive.. In addition, the compounds showed moderate to good antiradical (DPPH) activity. Theoretical calculations let us to confirm the reaction mechanism. Parameters drug-likeness and physicochemical properties including pharmacokinetic analysis of the synthesized compounds was performed using DruliTo program.
Removal of basic dyes from aqueous solutions using calix[4]resorcinarene carboxylic acid derivatives
(University of Mohammed Premier Oujda, 2015) Benosmane, Nadjib; Boutemeur, Baya; Hamdi, Safouane M.; Hamdi, Maamar
Water-insoluble calix[4]resorcinarenes derivative 1 and 2 were synthesized and used as sorbents to extract selected basic dyes rhodamine B (RB), methylen blue (MB) and methyl violet (MV). The isolated complex: calix[4]resorcinarene 1-dye were characterized by Fourier transform infrared spectroscopy, Fluorescence spectroscopy, PDRX and Differential scanning calorimetric analysis. The dye adsorption experiments were carried out from an aqueous solution in a batch reactor. The effect of several parameters has been determined to obtain the best experimental conditions. The equilibrium adsorption data were interpreted using Langmuir and Freundlich isotherms models (best correlation: R2 > 0.997). The calculated maximum adsorption capacity (qmax) for the RB at 25 °C were 29.49 mg/g at pH=8.3. The mechanism of adsorption onto the calix[4]resorcinarene is considered to be due to a host-guest interaction between the dye and azo-calix[4]resorcinarene molecular cavity. The results showed that calix[4]resorcinarene (1) can be considered as potential adsorbents for basic dye from dilute aqueous solution
The removal of phenol from synthetic wastewater using Calix[4]resorcinarene derivative based polymer inclusion membrane
(2016) Benosmane, Nadjib; Boutemeurb, B.; Hamdi, Safouane.M.; Hamdi, Maamar
In the present study, the removal of phenol from synthetic wastewater across polymer inclusion membrane (PIM) containing calix[4]resorcinarene derivative used as a carrier were investigated. Phenol removal showing high efficiency when transported through PIMs prepared from cellulose triacetate (CTA) as a polymeric support material and 2-NPOE as a plasticizer. The effects of membrane composition, type of plasticizer, carrier content, pH phase’s solution, and membrane stability, were examined in the facilitated transport experiments of phenol across PIM. A PIM containing 0.1 g CTA, 0.15g/g CTA of carrier and 1.5 g/g CTA of NPOE, provided the highest percentage of phenol over 5 days of transport, the feed solution in these transport experiments was at pH 2, while the stripping solution contained 0.25M NaOH. The prepared PIM were characterized by using Fourier transform Infra Red (FTIR), XRD and Thermo gravimetric analysis (TGA) techniques
Solvatochromic fluorescence characteristics of cinnamoyl pyrone derivatives
(Elsevier, 2017) Benosmane, Nadjib; Boutemeurb, Baya; Hamdi, Safouane M.; Hamdi, Maamar; Artur S.M., Silvad
The solvatochromic fluorescence behavior of cinnamoyl pyrone derivatives has been studied in several polar and non-polar solvents. The fluorescence spectra of these compounds exhibit red shift from its absorption spectra and present an excellent correlation with solvent polarity. Cinnamoyl pyrones show a significant spectral shift in fluorescence emission as a function of water composition in binary aqueous solutions mixture. This change is due to the specific intermolecular hydrogen bonding of cinnamoyl pyrones with a molecules of water, due to the deactivation of the lowest excited singlet state of these compounds. The relative quantum yields are calculated. It is found that the quantum yields of the cinnamoyl pyrones vary with the change in the solvent polarity indicating the dependency of fluorescence properties on the solvent nature. It has been observed that the addition of water and pH medium can affect the fluorescence properties of cinnamoyl pyrones in ethanol. This study exhibited that due to the solvent sensitive emission, cinnamoyl pyrone derivatives are a good compound to be used as fluorescence probes
Study of the novel fluorescent 4-methyl-9-(3-oxobutanoyl)-2H,8H-pyrano[2,3-f]chromene-2,8-dione derivative. estimation of the ground- and excited-state dipole moments from a solvatochromic shift
(Elsevier, 2017) Al-Kawkabani, Ahmed; Makhloufi-Chebli, Malika; Benosmane, Nadjib; Boutemeur-Kheddis, Baya; Hamdi, Maamar; Silva, Artur M.S.