title: Competitive adsorption of Reactive Orange 16 and Reactive Brilliant Blue R on polyaniline/bacterial extracellular polysaccharides composite--a novel eco-friendly polymer.
abstract: The performance of polyaniline/extracellular polymeric substances (Pn/EPS) composite as an adsorbent to remove the anionic reactive dyes, Reactive Brilliant Blue R (RBBR) and Reactive Orange 16 (RO), was investigated in single and binary systems. The pH(pzc) of Pn/EPS composite was calculated as 3.7 through potentiometric mass titration method. Electrostatic interaction between the dye anion and the nitrogen present in the polymer was identified as a major mechanism in adsorption process. Single component isotherms followed the Langmuir model with the maximum adsorption capacity of 0.5775 mmol g(-1) for RBBR and 0.4748 mmol g(-1) for RO. In binary system, both the reactive dye anions compete with each other and resulted in lower uptake. Binary adsorption data were interpreted well by the Sheindorf-Rehbun-Sheintuch equation as compared to extended Langmuir model with constant interaction factor. Kinetic analysis of single solute followed pseudo-first order model. Thermodynamic studies computed that RBBR and RO adsorption was endothermic, spontaneous, and feasible process.
authors.affiliation: Department of Chemistry, Periyar University, Salem 636011, Tamil Nadu, India.
authors.forename: V
authors.initials: V
authors.lastname: Janaki
authors.forename: K
authors.initials: K
authors.lastname: Vijayaraghavan
authors.forename: A K
authors.initials: AK
authors.lastname: Ramasamy
authors.forename: Kui-Jae
authors.initials: KJ
authors.lastname: Lee
authors.forename: Byung-Taek
authors.initials: BT
authors.lastname: Oh
authors.forename: Seralathan
authors.initials: S
authors.lastname: Kamala-Kannan
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry*; D000880:Anthraquinones / Q000302:isolation & purification*; D001391:Azo Compounds / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D011108:Polymers / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D013783:Textile Industry; D062065:Wastewater / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D000880:Anthraquinones; D001391:Azo Compounds; D011108:Polymers; D011135:Polysaccharides, Bacterial; D062065:Wastewater; C416807:polyaniline; C483723:reactive orange 16; C024758:Remazol Brilliant Blue R