Publications Scientifiques

Permanent URI for this communityhttps://dspace.univ-boumerdes.dz/handle/123456789/10

Browse

Has files: YesSubject: search.filters.subject.Cellulose

Search Results

Now showing 1 - 8 of 8
  • No Thumbnail Available
    Item
    Treatment and modeling of industrial liquid effluent adsorption isotherm on plant-based materials
    (Aljest, 2021) Chaouadi, Hiba; Aksas, Hammouche
    Margins are not degradable due to the presence of substances (phenols, volatile fatty acids, etc.), which pose problems for the environment. In order to protect our environment, and currently know various treatment pathways such as adsorption, we studied the effects of diethylaminoethyl-cellulose (DEAE-ellulose) on the constituents of a gem and studied the adsorption power of DEAEcellulose of phenolic compounds present in the gills of Tadmait willaya Tizi-Ouzou. The latter showed that the best adsorption conditions are simple to achieve: temperature of 22°C, direct use of the margin (Vm = 10 ml, pH = 4.5) in rather large quantities compared to that of the adsorbent (mass ratio = 10) and that the Freundlich model better represents the adsorption of the phenolic compounds of the margin on the DEAE cellulose. Infrared spectroscopy analyzes showed the complex composition of the margin in various organic constituents. MEB- EDS microscopy analyzes revealed amorphous morphologies of the cellulose and the dry matter of the margin
  • No Thumbnail Available
    Item
    Chemical characterization of pinus halepensis sapwood and heartwood
    (Taylor & Francis, 2018) Benouadah, Nacera; Aliouche, Djamel; Pranovich, Andrey; Willför, Stefan
  • No Thumbnail Available
    Item
    Preparation and characterization of cellulose/montmorillonite hybrid membranes
    (2015) Moulahcene-Abdelli, Fethia; Aliouche, Djamel
    The compounding of cellulose and inorganic Montmorillonite (MMT) on microscale molecular level has high potential to greatly improve the thermal stability, decay resistance and other properties of cellulose fibres. Pristine Algerian MMT was first sodium modified as Na-MMT, then organically modified as organophilic OMMT by using Octadecylamine. With OMMT and fibrous cellulose from waste cotton, cellulose/MMT composites were prepared via incorporation from solution process and characterized by XRD, FTIR and TGA. Dimethyl Acetamide/Lithium Chloride (DMAc/LiCl) solvent system was used for dispersing cellulose and clay. Results show that the preparation of OMMT was very successful; the X-ray diffraction results revealed that the interlayer spacing (2.17nm) for OMMT was increased compared with that (1.24nm) for Na-MMT. The composites exhibit higher thermal stability; addition of OMMT can considerably increase the decomposition temperature of cellulose matrix. An increase in thermal stability with clay content was observed by thermal analysis
  • No Thumbnail Available
    Item
    Use of wood waste (Aleppo pine) as a superplasticiser in self-compacting mortars
    (2014) Daoui, Abdelhakim; Safi, Brahim; Rezak, M.; Zerizer, A.
  • No Thumbnail Available
    Item
    Characterization of cellulose prepared from some Algerian lignocellulosic materials (zeen oak wood, Aleppo pine wood and date palm rachis)
    (Springer, 2015) Haddadou, Imane; Aliouche, Djamel; Brosse, Nicolas; Amirou, Siham
  • No Thumbnail Available
    Item
    Elaboration of cellulose based nanobiocomposite : effect of cellulose nanocrystals surface treatment and interface "melting"
    (Elsevier, 2015) Timhadjelt, Lamia; Serier, Aicha; Belgacem, Mohammed Naceur; Bras, Julien
  • No Thumbnail Available
    Item
    Modification of cellulose for an application in the waste water treatment
    (Springer, 2009) Timhadjelt, Lamia; Aissani, Zoubir; Boumerdassi, Karima; Serier, Mohamed; Serier, Aicha
    Today's dramatic shortage of water resources and alarming pollution has recently triggered a lot of research for alternative water resources. This study consists in modifying cellulose by grafting of the amidoxime groups for its use in the adsorption of the Cu2+, Cr3+ and sulphide ions present in industrial waste waters. Cellulose is an abundant biodegradable polymer. The amidoxime groups are strong complexants of metal ions. The grafting is achieved in two steps: cyanoethylation and amidoximation, confirmed by FT-IR. The optimum conditions and the parameters influencing the two reactions are determined by the kjeldahl's method and by FT-IR. The amidoxime quantity is determined by measuring the quantity of the amine functions by HCl proportioning. The implementation of the modified cellulose is intended for the adsorption of the metal ions Cu2+ and Cr3+ and sulphide ions S2− in a double adsorption. The FT-IR analysis reveals that the fixing of metal cations is based on the complexation of the latter with the ligands of the adsorbent. The optimum adsorption was recorded at pH = 6 for a contact time of 5 h and an initial concentration of 10−1M in metals. The desorption of fixed metals is possible by the EDTA, and the re-use of the adsorbent confirms the effectiveness of recycling
  • No Thumbnail Available
    Item
    Graft-copolymerization of acrylic monomers onto cellulose. influence on fibre swelling and absorbency
    (2006) Aliouche, D.; Sid, B.; Ait-Amar, H.
    The objective of our study was to show the increasing importance of the chemical modification, by grafting, of cellulose in order to get a cellulose material with improved absorption and retention. Acrylic monomers, i.e. acrylic acid and acrylonitrile, were grafted onto cellulose fibres by using a free radical process initiated by two types of redox initiators: persulfate radicals (potassium persulfate, KPS) and ceric ions (ceric ammonium nitrate, CAN). The fibrous celluloses used were: a treated Kraft fluff pulp, rayon fibres (regenerated cellulose) and short cotton fibres (mill waste). Major factors affecting graft co-polymerization onto cellulose (surface morphology of cellulose, initiation process, reaction temperature and hydrolysis of grafted samples) were studied. The grafting has been confirmed by infrared analysis through the apparition of new characteristic lines of monomers on the spectra of grafted samples. The maximum grafting yield was obtained at room temperature by using a CAN initiation technique. Retention values and grafting yield were determined: due to counter ion effect, the retention of a 0.9 % NaCl solution was about 70 % of the water retention value. The swelling of grafted samples is significantly higher than that observed for the native cellulose. The acrylic functions grafted onto cellulose improved the liquid retention of samples