Laboratory REMTEX

Casablanca, Morocco

Laboratory REMTEX

Casablanca, Morocco
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El Fargani H.,Abdelmalek Essaadi University | Lakhmiri R.,Abdelmalek Essaadi University | El Farissi H.,Abdelmalek Essaadi University | Albourine A.,University Ibn Zohr | And 2 more authors.
Journal of Materials and Environmental Science | Year: 2017

In this work, we study the elimination of two anionic dyes (Reactive Red 23 and Reactive Blue 19) in single and binary systems of dyes by adsorption on silica-chitosan composite (Si-Cs). This study focuses on the effectiveness of our Si-Cs composite synthesized chemically by the extraction of chitosan from shrimp « Pendalus Borealis » and « Crangon-Crangon« co-products by the hydrothermo-chemical technique. The composite obtained was characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDXA). The Si-Cs composite was found to have excellent dyes adsorption capacity in both single and binary system of dyes. Batch experiments were carried out for adsorption kinetics, isotherms and thermodynamics. Operational parameters studied were pH, contact time, temperature, dye and adsorbent concentrations. Dyes elimination percentage was between 89% and 97% in both systems, with an optimal contact time of 180min. Equilibrium data agreed well with the Freundlich isotherm model. While the kinetics and thermodynamics parameters were used to establish the adsorption mechanism, the pseudo-second-order kinetic model has presented the best fitting; Thermodynamic studies revealed that the nature of adsorption is not spontaneous and exothermic with a physical adsorption.

El Fargani H.,Abdelmalek Essaadi University | Lakhmiri R.,Abdelmalek Essaadi University | Albourine A.,University Ibn Zohr | Cherkaoui O.,Laboratory REMTEX | Safi M.,Hassan II University
Journal of Materials and Environmental Science | Year: 2016

The chitosan was extracted from shrimp "Pandalus Borrealis" co-products, by the classic and hydrothermo-chemical technique. The products obtained were characterized by infrared spectroscopy (FTIR). The results showed that the hydrothermo-chemical technique reduces the production time at least four times, and the chitosan has a higher deacetylation degree (60-85%) and yield (6-7% dry weight) than the classic process. The Chitosan has shown an adsorption capacity around 40 mg/g for removal the dye Reactive Red 23 for the following condition: initial dye concentration 150 mg/l; contact time 3 hours; pH = 3. This paper sets out a possibility or the use of waste from the sea food industry, so reducing their environmental impact.

El Bouchti M.,Laboratory REMTEX | El Bouchti M.,Laboratory of Engineering Materials LIMAT | Hannache H.,Laboratory REMTEX | Hannache H.,Laboratory of Engineering Materials LIMAT | And 4 more authors.
Autex Research Journal | Year: 2014

Polyamide 6.6 multifilaments are grafted with the monomer N-allyliminodiacetic acid for the purpose of removal of some heavy metal ions from their aqueous solutions by forming its metal chelate especially with Ag+ ion. Such a fibrous chelate-forming resin has been used with success due to its large surface area, which contains an important metal chelate-forming functional group, where metal ions are adsorbed or desorbed on its surface, and therefore having an improved adsorption and desorption capability. In previous work, chelate-forming fibre was characterised by ICP-AES analysis according to the digestion method by microwave. The antibacterial activity of the prepared fibre is investigated with Escherichia coli bacteria as reference, according to the zone of inhibition method in agar medium. The material used as reference without metal does not present any effect on E. coli. However, the chelateforming fibres with Ag+ have a strong bactericidal effect, even with a low concentration of silver ions. These modified materials can be used as highly effective bactericidal composites that may be used in future applications for the production of antimicrobial textiles, papers or polymer materials. © AUTEX.

Benmoussa D.,Laboratory REMTEX | Benmoussa D.,Hassan II University | Molnar K.,Budapest University of Technology and Economics | Hannache H.,Hassan II University | And 2 more authors.
Molecular Crystals and Liquid Crystals | Year: 2016

In textiles, the major interest in microencapsulation is currently in the application of durable fragrances, skin softeners, phase-change materials, antimicrobial agents and drug delivery systems onto textile materials. In our research “Polyethylene Glycol” was applied as phase change material and it was encapsulated in polymethacrylic acid (PMA) by radical polymerization in suspension of methacrylic acid in presence of N,N'-methylenebisacrylamide (MBAM) as crosslinking agent. Thereafter the obtained microcapsules were modified by amidation with ethylenediamine as a spacer molecule. At the end of this spacer trichlorotriazine reactive group was fixed. Microcapsules were grafted onto a cotton textile substrate. The surface morphologies of the microencapsulated phase change materials (micro PCMs) were studied by scanning electron microscopy (SEM). Thermal properties, thermal reliabilities and thermal stabilities of the as-prepared micro PCMs were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The obtained results reveal that the produced microcapsules had a mean diameter of 10 µm and the resistance of the microcapsules was demonstrated by thermal analysis. © 2016 Taylor & Francis Group, LLC.

Bouchti M.E.,Laboratory REMTEX | Bouchti M.E.,Hassan II University | Hannache H.,Hassan II University | Cherkaoui O.,Laboratory REMTEX
Advances in Polymer Technology | Year: 2013

The monomer N-allyliminodiacetic acid (ALD) has been synthesized and grafted onto polyamide 6.6 multifilament yarns to develop metal chelate-forming fiber using benzoyl peroxide (BPO) as an initiator. The grafting yield depends on critical parameters, such as the monomer ALD concentration, initiator BPO concentration, pH, temperature, and reaction time. Suitable conditions that give the highest graft yield are reported. The modification occurred on the polyamide 6.6 fibers by grafting is evaluated by several techniques such as Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, thermogravimetric analysis, and scanning electron microscopy. © 2013 Wiley Periodicals, Inc.

El Bouchti M.,Laboratory REMTEX | El Bouchti M.,Hassan II University | Grancaric A.M.,University of Zagreb | Botteri L.,University of Zagreb | And 2 more authors.
Journal of Materials and Environmental Science | Year: 2015

The removal of copper (Cu2+), and lead (Pb2+) ions from aqueous solutions with the functionalized Polyamide 6.6 Yarns with N-Allyliminodiacetic Acid to 20% (PA6.6-ALD-20%) chelating ion exchange fiber is described at different conditions. The removal of the above mentioned heavy metal ions from aqueous solutions was studied by batch method. The effects of initial metal concentration, contact time and pH on the removal of Cu2+ and Pb2+ ions were investigated. The percentage adsorption of Cu2+ and Pb2+ ions increased with an increase in contact time. The binding process was strongly affected by pH and the optimum pH for Cu2+ and Pb2+ ions were 5.0 and 6.0, respectively. The kinetic data was evaluated with the pseudo-first order and pseudo-second order models. Kinetic data correlated well with the pseudo-second-order kinetic model, indicating that the chemical adsorption was the rate-limiting step. The adsorption parameters were determined based on Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the adsorbent for Cu2+ and Pb2+ ions was calculated from the Langmuir isotherm and found to be 6.17 and 8.06 mg/g, respectively. Actually the percentage of removing Cu2+ and Pb2+ ions reached maximum to 55% and 78%, respectively.

Fettouche S.,Hassan II University | Fettouche S.,Laboratory REMTEX | Tahiri M.,Hassan II University | Madhouni R.,Laboratory REMTEX | Cherkaoui O.,Laboratory REMTEX
Journal of Materials and Environmental Science | Year: 2015

The absorbent Alfa fibers powder was used for its low cost, available and natural for removal of reactive textile dyes (reactive red 23 (RR-23) and reactive blue 19 (RB-19)) from aqueous solution. The absorbent Alfa fibers powder was obtained from leaf of Stippa Tenacissima L crushed and screened with a particle size less than < 2mm. Batch experiments were carried out for sorption kinetics and isotherms. Operating variables studied were pH, treatment time, temperature, dye and adsorbent concentrations. The adsorption parameters were determined based on Langmuir and Freundlich isotherm models. These parameters were obtained from the equilibrium adsorption data for the two reactive dyes. While the kinetics and thermodynamic parameters were used to establish the adsorption mechanism. As an adsorbent, Alfa fibers powder have a preference for Reactive Red 23, retaining up to 34.13 mg/g at 22°C, whereas a retention of only 11.33 mg/g at 22°C has been achieved by Reactive blue 19. Besides that, the thermodynamic study showed that the dye adsorption onto absorbent Alfa fibers powder was favourable, endothermic and spontaneous.

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