title: Removal of methylene blue dye from water by a spent bleaching earth biosorbent.
abstract: This work is about the valorization of spent bleaching earth (SBE) at low cost from the AFIA oil refinery in Algeria's western region. The biowaste has been burned to eliminate the oil traces, then it has been valorized in two ways: (i) chemically, using phosphoric acid to obtain SBEC and (ii) thermally at 750 °C to create SBEH. The obtained materials were used for the first time as biosorbents in the wastewater treatment field. The three biomaterials show very interesting adsorption properties, with specific surfaces of 194.2, 784.6 and 888.5 m2g-1for SBE, SBEC and SBEH, respectively. The analysis has revealed that the obtained materials are alumino-silicates. The three biowastes have been used to remove methylene blue dye from water. The dye was totally eliminated by a physisorption mechanism in the presence of 1 g L-1of each biowaste after 8, 10, 20 min of contact time. The highest correlation coefficient (R2= 0.99) was related to the Langmuir isotherm, indicating a good fit with this model, and explaining the biosorption as a monolayer process. According to this model, the adsorption capacities were 123.3, 185.2 and 188.7 mg g-1for SBE, SBEH and SBEC, respectively. This study shows that SBE can be used as an alternative to commercial adsorbents for dye removal from water.
authors.affiliation: Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation (STEVA), Université de Mostaganem, BP 188, Mostaganem 27000, Algeria E-mail: m.ghezzar@univ-mosta.dz; redouane.ghezzar@univ-mosta.dz; ghezzar_redouane@yahoo.fr.
authors.forename: Ali
authors.initials: A
authors.lastname: Belhaine
authors.affiliation: Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation (STEVA), Université de Mostaganem, BP 188, Mostaganem 27000, Algeria E-mail: m.ghezzar@univ-mosta.dz; redouane.ghezzar@univ-mosta.dz; ghezzar_redouane@yahoo.fr.
authors.forename: Mouffok Redouane
authors.initials: MR
authors.lastname: Ghezzar
authors.affiliation: Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation (STEVA), Université de Mostaganem, BP 188, Mostaganem 27000, Algeria E-mail: m.ghezzar@univ-mosta.dz; redouane.ghezzar@univ-mosta.dz; ghezzar_redouane@yahoo.fr.
authors.forename: Fatiha
authors.initials: F
authors.lastname: Abdelmalek
authors.affiliation: Laboratoire de Science et Genie des Materiaux, USTHB, Alger, Algeria.
authors.forename: Kamel
authors.initials: K
authors.lastname: Tayebi
authors.affiliation: Laboratoire Structure, Elaboration et Application des Matériaux Moléculaires, Université de Mostaganem, Mostaganem 27000, Algeria.
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Ghomari
authors.affiliation: Laboratoire des Sciences et Techniques de l'Environnement et de la Valorisation (STEVA), Université de Mostaganem, BP 188, Mostaganem 27000, Algeria E-mail: m.ghezzar@univ-mosta.dz; redouane.ghezzar@univ-mosta.dz; ghezzar_redouane@yahoo.fr.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Addou
mesh_terms: D000327:Adsorption; D006358:Hot Temperature; D007220:Industrial Waste; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D008962:Models, Theoretical; D009821:Oils; D010756:Phosphoric Acids / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D007220:Industrial Waste; D009821:Oils; D010756:Phosphoric Acids; D014874:Water Pollutants, Chemical; C030242:phosphoric acid; D008751:Methylene Blue