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Vol. 25 No. 7 (2013): Vol 25 Issue 7

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Removal of Lead(II) and Copper(II) from Hypersaline Media With Amorphous Tin(IV) Phosphate

https://doi.org/10.14233/ajchem.2013.13700
Wen-Bin Chen
Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, Jiangsu Province, P.R. China
Zhen Cao
School of Chemistry Engineering, Huaihai Institute of Technology, Liangyungang 222005, Jiangsu Province, P.R. China

Corresponding Author(s) : Wen-Bin Chen

lygcswb11@163.com

Asian Journal of Chemistry, Vol. 25 No. 7 (2013): Vol 25 Issue 7

Abstract

Amorphous tin(IV) phosphate was used as adsorbent for the removal of Pb(II) and Cu(II) from aqueous solutions. The extent of absorption was investigated as a function of pH, contact time, absorbent concentration and ionic strength. Experimental results showed that the amount of adsorbed heavy metal ions increased with the increase of solution pH in the examined range (3.0-6.5) and reaction time. The equilibrium data were analyzed using the Freundlich and Langmuir isotherm models. The results showed that the sorption process followed Langmuir model well. The maximum sorption capacity amounted to 378.79 and 250.0 mg/g at 25 ºC for Pb(II) and Cu(II), respectively. The free energy Es (kJ/mol) got from the Dubinin-Radushkevich isotherm indicated the sorption processes are chemical ion-exchange mechanism. The sorption mechanism of the process is the ion-exchange reaction between heavy metal ions and H+. The negative DGº values confirm the absorption processes are spontaneous. Ionic strength experiments show that it is feasible for amorphous tin(IV) phosphate in removing Pb(II) and Cu(II) from marine culture wastewater,though hyper-saline media has a certain harmful effect.

Keywords

Amorphous tin(IV) phosphate Hypersaline media Lead Copper Ion exchange
Chen, W.-B., & Cao, Z. (2013). Removal of Lead(II) and Copper(II) from Hypersaline Media With Amorphous Tin(IV) Phosphate. Asian Journal of Chemistry, 25(7), 3655–3659. https://doi.org/10.14233/ajchem.2013.13700
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