title: Kinetics and thermodynamics of basic dye sorption on phosphoric acid esterifying soybean hull with solid phase preparation technique.
abstract: In this paper, the solid phase preparation method of a cationic sorbent, which bears hydroxyl groups of phosphoric acid derived from esterified soybean hull (ESH), was reported. The sorption kinetics and thermodynamics of two basic dyes, acridine orange (AO) and malachite green (MG), from aqueous solution onto ESH were investigated with a batch system. The isothermal data of dye sorptions followed the Langmuir model better than the Freundlich model. The maximum sorption capacity (Q(m)) of ESH for AO and MG was 238.1 mg/g and 178.57 mg/g, respectively. The dye sorption processes could be described by the pseudo-second-order kinetic model. The thermodynamic study indicated that the dye sorptions were spontaneous and exothermic. Lower temperatures were favorable for the sorption processes.
authors.affiliation: The Laboratory of Bio-Macromolecular Evolution, College of Life Science, Anhui Normal University, Wuhu 241000, PR China.
authors.forename: Renmin
authors.initials: R
authors.lastname: Gong
authors.forename: Jin
authors.initials: J
authors.lastname: Sun
authors.forename: Demin
authors.initials: D
authors.lastname: Zhang
authors.forename: Keding
authors.initials: K
authors.lastname: Zhong
authors.forename: Guoping
authors.initials: G
authors.lastname: Zhu
mesh_terms: D000165:Acridine Orange / Q000737:chemistry; D000327:Adsorption; D001709:Biotechnology / Q000379:methods*; D002412:Cations; D004396:Coloring Agents / Q000737:chemistry* / Q000494:pharmacology; D007202:Indicators and Reagents / Q000737:chemistry* / Q000494:pharmacology; D007220:Industrial Waste; D007700:Kinetics; D008956:Models, Chemical; D010756:Phosphoric Acids / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry; D012394:Rosaniline Dyes / Q000737:chemistry; D013025:Glycine max; D013816:Thermodynamics; D014874:Water Pollutants, Chemical
chemical_list: D002412:Cations; D004396:Coloring Agents; D007202:Indicators and Reagents; D007220:Industrial Waste; D010756:Phosphoric Acids; D012394:Rosaniline Dyes; D014874:Water Pollutants, Chemical; C005095:malachite green; D010758:Phosphorus; C030242:phosphoric acid; D000165:Acridine Orange