title: Application of Ulva lactuca and Systoceira stricta algae-based activated carbons to hazardous cationic dyes removal from industrial effluents.
abstract: Marine algae Ulva lactuca (ULV-AC) and Systoceira stricta (SYS-AC) based activated carbons were investigated as potential adsorbents for the removal of hazardous cationic dyes. Both algae were surface oxidised by phosphoric acid for 2 and subsequently air activated at 600 °C for 3 h. Dyes adsorption parameters such as solution pH, contact time, carbon dosage, temperature and ionic strength were measured in batch experiments. Adsorption capacities of 400 and 526 mg/g for Malachite green and Safranine O by the SYS-AC and ULV-AC respectively were significantly enhanced by the chemical treatments. Model equations such as Langmuir, Freundlich and Temkin isotherms were used to analyse the adsorption equilibrium data and the best fits to the experimental data were provided by the first two isotherm models. BET, FT-IR, iodine number and methylene blue index determination were also performed to characterize the adsorbents. To describe the adsorption mechanism, kinetic models such as pseudo-second-order and the intra particle diffusion were applied. Thermodynamic analysis of the adsorption processes of both dyes confirms their spontaneity and endothermicity. Increasing solution ionic strength increased significantly the adsorption of Safranine O. This study shows that surface modified algae can be an alternative to the commercially available adsorbents for dyes removal from liquid effluents.
authors.affiliation: Laboratoire de Structure, Elaboration et Applications des Matériaux Moléculaires (SEA2M), Université Abdelhamid Ibn Badis de Mostaganem, B.P. 188, Mostaganem 27000, Algeria.
authors.forename: Attouti
authors.initials: A
authors.lastname: Salima
authors.forename: Bestani
authors.initials: B
authors.lastname: Benaouda
authors.forename: Benderdouche
authors.initials: B
authors.lastname: Noureddine
authors.forename: Laurent
authors.initials: L
authors.lastname: Duclaux
mesh_terms: D000327:Adsorption; D002244:Carbon; D002606:Charcoal / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D008751:Methylene Blue / Q000737:chemistry; D009994:Osmolar Concentration; D000459:Phaeophyceae; D010619:Phenazines / Q000737:chemistry / Q000302:isolation & purification; D012394:Rosaniline Dyes / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D044445:Ulva; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D010619:Phenazines; D012394:Rosaniline Dyes; D014874:Water Pollutants, Chemical; C005095:malachite green; D002606:Charcoal; D002244:Carbon; D008751:Methylene Blue; C009195:safranine T