期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 9, 期 -, 页码 29-37出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jwpe.2015.11.002
关键词
Nano La2O3; Congo red; Sorption kinetics; Isotherms; Desorption
In this study, utilization of green synthesized nano La2O3 for adsorptive removal of Congo red from aqueous solution was investigated. Crystalline character, particle size, stability, formation and morphology of nano La2O3 were investigated from XRD, FT-IR, TG/DTG, SEM and TEM techniques. The pH impact, sorption kinetics, isotherms and thermodynamics of Congo red adsorption on La2O3 were investigated. The adsorption isotherm data gave better fit to the Freundlich isotherm model, with a maximum Congo red adsorption capacity of 185.64 mgg(-1). Kinetic data correlated well with the pseudo-first-order kinetic model. Electrostatic force of attraction and H-bonding were conceived as the main adsorption mechanism. 1:1 mixture of NaOH and acetone was an effective desorption agent for desorption of nano La2O3 loaded by Congo red. (C) 2015 Elsevier Ltd. All rights reserved.
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