title: An improved method for removal of azo dye orange II from textile effluent using albumin as sorbent.
abstract: Azo dyes are generally resistant to biodegradation due to their complex structures. Acid orange II is one of the most widely used dyes in the textile industry. The influence of bovine serum albumin (BSA) in different concentrations, pH, and time of contact on Orange II was investigated using kinetics and adsorption-isotherm experiments. The results showed that the maximum colour removed from dye/albumin was 99.50% and that a stable dye-protein complex had been formed at pH 3.5 and in a proportion of 1:3 (v/v), respectively. The synthetic effluent did not show toxicity to the microcrustacean Artemia salina, and showed a CL₅₀ equal to 97 µg/mL to azo dye orange II. Additionally, the methodology was effective in removing the maximum of orange II using BSA by adsorption at pH 3.5 which mainly attracted ions to the azo dye during the adsorption process. This suggests that this form of treatment is economical and easy to use which potentially could lead to bovine serum albumin being used as a sorbent for azo dyes.
authors.affiliation: Technical School SENAI-Paulista, Paulista 53417-710, PE, Brazil.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Ohashi
authors.forename: Alícia M T
authors.initials: AM
authors.lastname: Jara
authors.forename: Anabelle C L
authors.initials: AC
authors.lastname: Batista
authors.forename: Luciana O
authors.initials: LO
authors.lastname: Franco
authors.forename: Marcos A
authors.initials: MA
authors.lastname: Barbosa Lima
authors.forename: Mohand
authors.initials: M
authors.lastname: Benachour
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Alves da Silva
authors.forename: Galba M
authors.initials: GM
authors.lastname: Campos-Takaki
mesh_terms: D000818:Animals; D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002417:Cattle; D003116:Color; D004396:Coloring Agents / Q000737:chemistry; D007220:Industrial Waste; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D013784:Textiles; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D012710:Serum Albumin, Bovine; C014722:2-naphthol orange