The Adsorption of Cd(II) on Manganese Oxide Investigated by Batch and Modeling Techniques

Xiaoming Huang, Tianhu Chen, Xuehua Zou, Mulan Zhu, Dong Chen and Min Pan
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Xiaoming Huang: Laboratory of Nano-Minerals and Environmental Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
Tianhu Chen: Laboratory of Nano-Minerals and Environmental Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
Xuehua Zou: Laboratory of Nano-Minerals and Environmental Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
Mulan Zhu: School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, China
Dong Chen: Laboratory of Nano-Minerals and Environmental Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
Min Pan: School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, China

IJERPH, 2017, vol. 14, issue 10, 1-11

Abstract: Manganese (Mn) oxide is a ubiquitous metal oxide in sub-environments. The adsorption of Cd(II) on Mn oxide as function of adsorption time, pH, ionic strength, temperature, and initial Cd(II) concentration was investigated by batch techniques. The adsorption kinetics showed that the adsorption of Cd(II) on Mn oxide can be satisfactorily simulated by pseudo-second-order kinetic model with high correlation coefficients (R 2 > 0.999). The adsorption of Cd(II) on Mn oxide significantly decreased with increasing ionic strength at pH < 5.0, whereas Cd(II) adsorption was independent of ionic strength at pH > 6.0, which indicated that outer-sphere and inner-sphere surface complexation dominated the adsorption of Cd(II) on Mn oxide at pH < 5.0 and pH > 6.0, respectively. The maximum adsorption capacity of Mn oxide for Cd(II) calculated from Langmuir model was 104.17 mg/g at pH 6.0 and 298 K. The thermodynamic parameters showed that the adsorption of Cd(II) on Mn oxide was an endothermic and spontaneous process. According to the results of surface complexation modeling, the adsorption of Cd(II) on Mn oxide can be satisfactorily simulated by ion exchange sites (X 2 Cd) at low pH and inner-sphere surface complexation sites (SOCd + and (SO) 2 CdOH ? species) at high pH conditions. The finding presented herein plays an important role in understanding the fate and transport of heavy metals at the water–mineral interface.

Keywords: cadmium; Mn oxides; adsorption; surface complexation modeling (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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