Premium
Recycle of Ag + and Zn 2+ with Magnetic Adsorbent in Process of Its Purification from Wastewater
Author(s) -
Wu Fan,
Zhang Ying Xue,
Le Chen Yong,
Qian Hao
Publication year - 2014
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201200274
Subject(s) - adsorption , freundlich equation , desorption , endothermic process , langmuir adsorption model , metal ions in aqueous solution , aqueous solution , metal , monolayer , chemistry , materials science , langmuir , wastewater , chemical engineering , inorganic chemistry , waste management , nanotechnology , organic chemistry , engineering
A highly reusable magnetic polymer beads was employed as adsorbent to extract Ag + and Zn 2+ from aqueous solution. Because of its excellent ability to adsorb Ag + and Zn 2+ , after adsorption, the residual concentration of Zn 2+ or Ag + is far lower than the wastewater discharge Standard of China. The pseudo‐second‐order kinetic model was suitable to describe the responding adsorption behavior. The adsorption isotherm of Ag + fitted best with Langmuir model, suggesting a monolayer adsorption occurred between metal ions on these magnetic beads. But the adsorption isotherm of Zn 2+ could be well described by Freundlich model. From the thermodynamic parameters, it indicated that this adsorption process was endothermic. Furthermore, the binding metal ions on the magnetic adsorbent could be easily recovered by eluting with acidic solution without changing the valance state of these metal ions. Moreover, the responding regeneration of these magnetic beads could be performed in alkali solution. Even after 20 runs of adsorption–desorption–regeneration, the adsorption ability of these magnetic beads changed little. These advantages, including excellent stability, favorable adsorption capacity, simple operation, and prominent recoverability, bring great potential to this technology in the removal of hazardous heavy metal ions from wastewater.