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Efficient Removal of Cd(II) Using SiO 2 -Mg(OH) 2 Nanocomposites Derived from Sepiolite

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  • Zhendong He

    (Hunan Provincial Key Laboratory of Shale Gas Resource Exploitation, Xiangtan 411201, China
    School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

  • Bozhi Ren

    (Hunan Provincial Key Laboratory of Shale Gas Resource Exploitation, Xiangtan 411201, China
    School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)

  • Andrew Hursthouse

    (Hunan Provincial Key Laboratory of Shale Gas Resource Exploitation, Xiangtan 411201, China
    School of Computing, Engineering & Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, UK)

  • Zhenghua Wang

    (Hunan Provincial Key Laboratory of Shale Gas Resource Exploitation, Xiangtan 411201, China)

Abstract

The pollution of Cadmium (Cd) species in natural water has attracted more and more attention due to its high cumulative toxicity. In the search for improved removal of cadmium from contaminated water, we characterized uptake on a recently identified nanomaterial (SiO 2 -Mg(OH) 2 ) obtained by subjecting sepiolite to acid-base modification. The structural characteristics of SiO 2 -Mg(OH) 2 were analyzed by means of SEM-EDS, Fourier Transform Infra-Red Spectroscopy (FTIR) and Powder X-ray Diffraction (PXRD). Static adsorption experiments were carried out to evaluate the effect of contact time, temperature, amount of adsorbent, and pH-value on the adsorption of Cd(II) by SiO 2 -Mg(OH) 2 . The results show that the pore structure of SiO 2 -Mg(OH) 2 is well developed, with specific surface area, pore size and pore volume increased by 60.09%, 16.76%, and 43.59%, respectively, compared to natural sepiolite. After modification, the sepiolite substrate adsorbs Cd(II) following pseudo-second-order kinetics and a Langmuir surface adsorption model, suggesting both chemical and physical adsorption. At 298 K, the maximum saturated adsorption capacity fitted by Sips model of SiO 2 -Mg(OH) 2 regarding Cd(II) is 121.23 mg/g. The results show that SiO 2 -Mg(OH) 2 nanocomposite has efficient adsorption performance, which is expected to be a remediation agent for heavy metal cadmium polluted wastewater.

Suggested Citation

  • Zhendong He & Bozhi Ren & Andrew Hursthouse & Zhenghua Wang, 2020. "Efficient Removal of Cd(II) Using SiO 2 -Mg(OH) 2 Nanocomposites Derived from Sepiolite," IJERPH, MDPI, vol. 17(7), pages 1-12, March.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:7:p:2223-:d:337337
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    References listed on IDEAS

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    1. Zhenghua Wang & Lina Liao & Andrew Hursthouse & Na Song & Bozhi Ren, 2018. "Sepiolite-Based Adsorbents for the Removal of Potentially Toxic Elements from Water: A Strategic Review for the Case of Environmental Contamination in Hunan, China," IJERPH, MDPI, vol. 15(8), pages 1-15, August.
    2. Feng Jiang & Bozhi Ren & Andrew S. Hursthouse & Yingying Zhou, 2018. "Trace Metal Pollution in Topsoil Surrounding the Xiangtan Manganese Mine Area (South-Central China): Source Identification, Spatial Distribution and Assessment of Potential Ecological Risks," IJERPH, MDPI, vol. 15(11), pages 1-16, October.
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