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

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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
    School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, 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)

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.

Suggested Citation

  • Xiaoming Huang & Tianhu Chen & Xuehua Zou & Mulan Zhu & Dong Chen & Min Pan, 2017. "The Adsorption of Cd(II) on Manganese Oxide Investigated by Batch and Modeling Techniques," IJERPH, MDPI, vol. 14(10), pages 1-11, September.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:10:p:1145-:d:113564
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    References listed on IDEAS

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    1. Danious P. Sounthararajah & Paripurnanda Loganathan & Jaya Kandasamy & Saravanamuthu Vigneswaran, 2015. "Effects of Humic Acid and Suspended Solids on the Removal of Heavy Metals from Water by Adsorption onto Granular Activated Carbon," IJERPH, MDPI, vol. 12(9), pages 1-15, August.
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    Cited by:

    1. Mengjie Wu & Hongyu Liu & Chunping Yang, 2019. "Effects of Pretreatment Methods of Wheat Straw on Adsorption of Cd(II) from Waterlogged Paddy Soil," IJERPH, MDPI, vol. 16(2), pages 1-21, January.
    2. Mohammed Umar Abba & Hasfalina Che Man & Raba’ah Syahidah Azis & Aida Isma Idris & Muhammad Hazwan Hamzah & Mohammed Abdulsalam, 2021. "Synthesis of Nano-Magnetite from Industrial Mill Chips for the Application of Boron Removal: Characterization and Adsorption Efficacy," IJERPH, MDPI, vol. 18(4), pages 1-18, February.

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