title: Competitive biosorption of Acid Blue 25 and Acid Red 337 onto unmodified and CDAB-modified biomass of Aspergillus oryzae.
abstract: The performance of unmodified and cetyldimethylethyl ammonium bromide (CDAB) modified nonviable Aspergillus oryzae for removal of Acid Blue 25 (AB 25) and Acid Red 337 (AR 337) was investigated in single and binary systems. In single system, the biosorption capacities of CDAB-modified biosorbent reached 160.36 and 280.39mg g(-1) for AB 25 and AR 337, respectively, which were 1.52 and 1.66 times higher than that of unmodified biosorbent. In binary system, the biosorption capacities of unmodified and CDAB-modified biosorbents for both dyes decreased significantly compared to that in single system. Relative competitiveness analysis demonstrated that there existed critical initial concentration ratio which determined the predominance of dyes during biosorption process. The biosorption of AB 25 was found to be in dominant position at initial concentration ratio of [AB 25]/[AR 337] above 0.63. Kinetic analysis indicated that intraparticle diffusion was the limiting step for biosorption of two dyes onto biosorbents.
authors.affiliation: College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yuyi
authors.initials: Y
authors.lastname: Yang
authors.forename: Danfeng
authors.initials: D
authors.lastname: Jin
authors.forename: Guan
authors.initials: G
authors.lastname: Wang
authors.forename: Sheng
authors.initials: S
authors.lastname: Wang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Jia
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000327:Adsorption; D000880:Anthraquinones / Q000737:chemistry*; D001236:Aspergillus oryzae / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D001673:Biodegradation, Environmental; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D009282:Naphthalenesulfonates / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*
chemical_list: C542340:1-amino-9,10-dihydro-9,10-dioxo-4-(phenylamino)-2-anthracenesulfonic acid; D000880:Anthraquinones; D001391:Azo Compounds; D009282:Naphthalenesulfonates; D000644:Quaternary Ammonium Compounds; C568619:cetyldimethylethylammonium; C568618:acid red 337