title: Adsorption kinetics and thermodynamics of acid Bordeaux B from aqueous solution by graphene oxide/PAMAMs.
abstract: Graphene oxide/polyamidoamines dendrimers (GO/PAMAMs) composites were synthesized via modifying GO with 2.0 G PAMAM. The adsorption behavior of the GO/PAMAMs for acid Bordeaux B (ABB) was studied and the effects of media pH, adsorption time and initial ABB concentration on adsorption capacity of the adsorbent were investigated. The optimum pH value of the adsorption of ABB onto GO/PAMAMs was 2.5. The maximum adsorption capacity increased from 325.78 to 520.83 mg/g with the increase in temperature from 298 to 328 K. The equilibrium data followed the Langmuir isotherm model better than the Freundlich model. The kinetic study illustrated that the adsorption of ABB onto GO/PAMAMs fit the pseudo-second-order model. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process.
authors.affiliation: Key Laboratory of Hunan Ecotourism, Jishou University, Jishou, Hunan 416000, China E-mail: chemfzhang@163.com; College of Chemistry and Chemical Engineering, Jishou University, Jishou Hunan 416000, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Jishou University, Jishou Hunan 416000, China.
authors.forename: Shengfu
authors.initials: S
authors.lastname: He
authors.affiliation: College of Chemistry and Chemical Engineering, Jishou University, Jishou Hunan 416000, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.affiliation: College of Chemistry and Chemical Engineering, Jishou University, Jishou Hunan 416000, China.
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Peng
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000302:isolation & purification*; D050091:Dendrimers / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010087:Oxides; D013696:Temperature; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D050091:Dendrimers; D010087:Oxides; C104700:PAMAM Starburst; D014874:Water Pollutants, Chemical; C000603516:acid Bordeaux B; D006108:Graphite