期刊
JOURNAL OF ENVIRONMENTAL ENGINEERING
卷 138, 期 9, 页码 940-948出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EE.1943-7870.0000553
关键词
Adsorption; Cd2+ ions; PS-EDTA resins; Isotherm; Kinetics; Thermodynamics
资金
- National Major Specific Program of Science and Technology on Controlling and Administering of Water's Pollution [2009ZX07212-001-04]
- Sustentation Program of Science and Technology of China [2006BRD01B03]
- scientific research ability training of undergraduate students majoring in chemistry by the two patters based on the tutorial system and top students [J1103307]
Batch adsorption experiments were conducted using environment-friendly prepared chelating ethylenediaminetetraacetic sodium modified polystyrene-based (PS-EDTA) resins as an adsorbent to adsorb Cd2+ from aqueous system in which experimental parameters were studied including solution pH, adsorbent dose, contact time, initial metal concentration and temperature. The Langmuir, Freundlich, and Dubinin-Radushkevich (DR) isotherm models were employed to analyze the experimental data among which Freundlich isotherm model was found to be suitable for Cd2+ adsorption. In addition, Cd2+ adsorption on PS-EDTA resins fitted well to the pseudo-second-order kinetic model. Intraparticle diffusion studies revealed that surface adsorption and intraparticle diffusion were both involved in the adsorption of Cd2+ ions. Thermodynamic parameters such as Gibbs free energy (Delta G degrees), enthalpy change (Delta H degrees), and entropy change (Delta S degrees) were calculated and indicated that adsorption of Cd2+ ions onto PS-EDTA resins was a spontaneous and endothermic process. The effects of various salts and coexisting heavy metal ions on Cd2+ ions adsorption were also investigated. Moreover, the results from the sequential adsorption-desorption cycles showed that PS-EDTA resins held good reusability and this could be a potential application in the fixed-bed continuous-flow column for the removal of heavy metals. DOI: 10.1061/(ASCE)EE.1943-7870.0000553. (C) 2012 American Society of Civil Engineers.
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