Propriétés adsorbantes des billes de lignine: application au traitement des eaux usées

This study investigated the adsorption of the heavy metal ions Cd (II) on a lignin isolated from sugar cane bagasse, by alkali treatment. This lignin is converted to beads using another polymer of marine origin, to test its ability to remove heavy metals from wastewater. Factors influencing Cd adsorption such as initial Cd ion concentration (5-50mg/l), pH (1-8), contact times (15min-4h) were investigated. The adsorption process was relatively fast and equilibrium was established about 2h. Maximum adsorption of cadmium ions occurred at around pH 5. The adsorption equilibrium data fitted best with the Freundlich and Dubinin-Radushkevich isotherms, and showed that the adsorption was physical in natureCette étude a eu pour but d’examiner l'adsorption des ions de métaux lourds Cd (II) sur une lignine isolé à partir de la bagasse de canne à sucre, après un traitement alcalin. Cette lignine est convertie en des perles en utilisant un autre polymère d'origine marine, pour tester son aptitude à éliminer les métaux lourds des eaux usées. Les facteurs influant sur l’adsorption du Cd tels que la concentration d'ions de Cd initiale (5-50mg / L), le pH (1-8), les temps de contact (15min-4h) ont été étudiés. Le processus d'adsorption est relativement rapide et l'équilibre a été établi après environ 2h. L’adsorption maximale des ions de cadmium est obtenue à un pH d'environ 5. Les équilibre d'adsorption suivent les isothermes de Freundlich et Dubinin-Radushkevich, et ont montré que l'adsorption était de nature physique

Effects of Phenol Addition on Oil Extraction from Moroccan Oil Shale by Supercritical Toluene

In the present work, the effect of phenol on the supercritical extraction of the organic matter from Tarfaya's oil shale with toluene was evaluated. The experimental results showed clearly that phenol had a significant effect on the yield and the composition of the oils obtained. Moreover, it was shown that phenol was a very efficient modifier for oil shale, giving a good yield of recovery and a suitable maturation of the organic matter. The pitches prepared by mixing phenol and toluene contain more aromatics and have a high char yield at 950 °C compared to those obtained by extraction with supercritical toluene alone

Comparison of chemical and physical activation processes at obtaining adsorbents from moroccan oil shale

Within the Moroccan natural resources valorisation scheme, new adsorbents have been prepared from oil shale by chemical and physical activation processes. The activation process the authors have developed in this study give effective adsorbent materials. In view of the physico-chemical properties of these materials and application to the treatment of water loaded with a metal (Cr6+ ion) or organic (methylene blue (MB)) pollutant, it is concluded that the chemical activation process of oil shale at low temperature (250 °C) affords the best material. The material’s yield is good in comparison with the physical activation at the same temperature and the process is energy saving differently from that at 450 °C. Moreover, the chemical activation of oil shale with phosphoric acid at 250 °C produces a material with a good yield (about 70%), a high specific surface area (approximately 600 m2 /g) and a highly porous structure, which gives it a high retention of methylene blue and the Cr6+ ion

Elaboration and characterization of a new activated carbon obtained from oregano residue: Application in environmental field

This study focuses on the valorization of extraction residues of medicinal plants which represent approximately 80% of the gross weight of the plant. In this context we proceeded to the transformation of “marc oregano” to a material adsorbent type activated carbon. The oregano marc, obtained after extraction of essential oils and organic compounds, has undergone a chemical activation using the phosphoric acid 85% (H3PO4). It is well known as precursors of lignocellulosic activating agent, allows the development of a large porosity in the activated material. The activated product has subsequently underwent heat treatment in the temperature range from 200 to 350 °C. The optimum temperature for development was set at 300 °C. The results obtained showed that the adsorbent material O300 has developed the interesting textural properties. It is an adsorbent material like activated carbon, which presents, according to the BET method, a specific surface of 1200 m2·g−1 (specific surface area of commercial activated carbon is of about 905 m2·g−1). The application of adsorbent material developed O300 in microbial decontamination of urban waste water, has revealed its effectiveness and its important adsorptive properties against pathogens pollutants from wastewater

Extraction and Recovery of Bioactive Metabolites from Marine Spongeand#8220;Ircinia spinulosaand#8221;

Oceans cover more than 75% of our planet. In some ecosystems, such as coral reefs, experts believe that biodiversity is greater than that of tropical forests. Morocco, with its double facade Atlantic and Mediterranean, long of more than 3500 km, is a country deeply influenced by the sea, which implies the existence of thousands of marine species by reports in other countries. Currently, marine organisms are a very important source of new molecules in pharmacology and thus in the development of new bioactive products. Sponges, in particular, given their very primitive origin and persistence during evolution, have developed a chemical defense system. This study aims the biological valorization of crude extract from a marine sponge collected in Atlantic coastal El Jadida: Ircinia spinulosa. The chemical study of Ircinia spinulosa, marine sponge was realized for the first time in Morocco, and revealed that this sponge contains different levels of primary and secondary metabolites. Analysis of fatty acids in the lipid extract of Ircinia spinulosa is performed by gas chromatography coupled with mass spectrometry (GC-MS) was used to determine the predominance of acid Palmitic. This molecular diversity of sponges has a large deposit of biological and biomedical potential. What pushed us to continue the research to isolate new and original molecules

Extraction and Recovery of Bioactive Metabolites from Marine Spongeand#8220;Ircinia spinulosaand#8221;

Oceans cover more than 75% of our planet. In some ecosystems, such as coral reefs, experts believe that biodiversity is greater than that of tropical forests. Morocco, with its double facade Atlantic and Mediterranean, long of more than 3500 km, is a country deeply influenced by the sea, which implies the existence of thousands of marine species by reports in other countries. Currently, marine organisms are a very important source of new molecules in pharmacology and thus in the development of new bioactive products. Sponges, in particular, given their very primitive origin and persistence during evolution, have developed a chemical defense system. This study aims the biological valorization of crude extract from a marine sponge collected in Atlantic coastal El Jadida: Ircinia spinulosa. The chemical study of Ircinia spinulosa, marine sponge was realized for the first time in Morocco, and revealed that this sponge contains different levels of primary and secondary metabolites. Analysis of fatty acids in the lipid extract of Ircinia spinulosa is performed by gas chromatography coupled with mass spectrometry (GC-MS) was used to determine the predominance of acid Palmitic. This molecular diversity of sponges has a large deposit of biological and biomedical potential. What pushed us to continue the research to isolate new and original molecules

Development of A New Biosorbent Based on The Extract Residue of Marine Alga Sargassum Vulgare: Application in Biosorption of Volatile Organic Compounds

The objective of this study is the valorization of a sub-product of marine alga it is the extract residue of the marine alga Sargassum vulgare, which represents more than 80% of the weight of the raw material. It is a natural residue thatnbsp wenbsp couldnbsp turnnbsp into nbspbiosorbentnbsp undernbsp thenbsp effectnbsp ofnbsp chemicalnbsp activationnbsp withnbsp phosphoricnbsp acidnbsp whichnbsp allowsnbsp the development of a large pore in the activated material.nbsp To optimize the conditions for elaboration of our biosorbent, experimental design was applied to reduce the number of experiment trials needed to evaluatenbsp some parameters (percentage of phosphoric acid, temperature and time of activation) and theirnbsp effects on the responses (capacity of biosorption of methylene blue, yield biosorbent).nbsp The product obtained under the optimal conditions has good textural and structural properties and development of surface functions.nbsp The application of optimized biosorbent in the treatment of gaseous effluents, has revealed its efficiency and significant biosorption properties towards some volatile organic compounds i .e.nbsp the toluene, the cyclohexane and the ethylbenzene

Comparison of the impact of different extraction methods on polyphenols yields and tannins extracted from Moroccan Acacia mollissima barks

International audienc

Porous ceramic from Moroccan natural phosphate and raw clay

International audienc

Bioactives properties of extracts from moroccan oil shale

Oil shale have constituted for a long time, an economical hope for countries which possesses important reserves of these rocks and view to use them as an energy source substitute for petroleum [...