Citation: FU Cheng, MA Cong-Cong, WU Qiong, YU Yan. Kinetics and Thermodynamics of the Adsorption of Copper(Ⅱ) onto a New Fe-Si Adsorbent[J]. Chinese Journal of Structural Chemistry, ;2015, 34(1): 49-55. doi: 10.14102/j.cnki.0254-5861.2011-0407 shu

Kinetics and Thermodynamics of the Adsorption of Copper(Ⅱ) onto a New Fe-Si Adsorbent

1.
College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China

Received Date: 9 June 2014
Available Online: 19 August 2014
Fund Project:

A new kind of Fe-Si adsorbent was synthesized by iron oxide and diatomite after calcining and hydrothermal process. The influences of the initial Cu²⁺ concentration, pH and adsorption time on the Cu²⁺ removal efficiency were discussed. Three adsorption empirical kinetics equations and two thermodynamics equations were used to simulate the adsorption process. The microstructures of newly developed copper removal materials and properties of copper removal are characterized in details by SEM and EDS. Adsorption mechanism of the adsorbent was discussed. The suitable pH value for Cu²⁺ removal is 5.0 to 6.0 and the adsorption capacity increases with increasing the initial Cu²⁺ concentration. The adsorption kinetics of the adsorbent could be better described by pseudo second order kinetic model, whereas the adsorption isotherms highly conform to the Freundlich equation. The main crystalline phase of the adsorbent is Fe(SiO₃) which can build porous structures conducive to the Cu²⁺ adsorption.
- diatomite,
- copper(Ⅱ) absorption,
- kinetics,
- thermodynamics
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