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    Potential of Saudi natural clay as an effective adsorbent in heavy metals removal from wastewater

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    Publication date
    2019-08
    Author
    Khan, M.I.
    Almesfer, M.K.
    Danish, M.
    Ali, I.H.
    Shoukry, H.
    Patel, Rajnikant
    Gardy, J.
    Nizami, A.S.
    Rehan, M.
    Keyword
    Heavy metals
    Natural clay
    Adsorption
    Wastewater
    Water pollution
    Peer-Reviewed
    Yes
    Open Access status
    closedAccess
    
    Metadata
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    Abstract
    This study aims to examine the potential of natural clay mineral from the southern part of Saudi Arabia as an effective adsorbent material for the removal of heavy metal ions of cadmium (Cd) and nickel (Ni) from aqueous solutions. The SEM analysis showed that clay particles had mixed shapes such as elongated rod-like and rectangular shape having rough corners with larger particles of 2-8 µm in size and smaller particles in the sub-micron size range. X-ray diffraction data revealed that clay particles had a good crystalline structure and composed of a mixture of various minerals including feldspar, illite, quartz, calcite, and gypsum. The BET surface area was found to be 35 ± 1 m ² /g and the average pore size and pore volume of 6.5 ± 0.5 nm and 5.7e-02 cc/g, respectively. The X-ray fluorescence analysis of clay showed main compounds of SiO₂ (47.33%), Al₂O₃ (18.14%), Fe₂O₃ (15.89%) with many others such as CaO, MgO, TiO₂, and K₂O in minor quantities. It was found that 1.2 g of clay removed up to 99.5% of Ni and 97.5% of Cd from 40 ppm aqueous solutions. The metal removal efficiencies were increased from around 95% up to 99% by increasing the pH of aqueous solutions from 4 to 11. The adsorption of Ni and Cd ions on Saudi clay was relatively fast, and up to 97% of ions were removed from solution within 45 min. The SEM-EDX and BET analysis for recycled clays further confirmed that the metal ions were removed from water through adsorption onto the clay. The experimental data fitted well with Langmuir and Freundlich isotherms. The maximum adsorption capacity of clay for Cd and Ni from isotherms was found to be 3.3 and 2.7 mg/g respectively. The findings of this study confirm the potential role of Saudi natural clay in wastewater treatment processes as a cheap, environment-friendly and safe natural adsorbent material.
    URI
    http://hdl.handle.net/10454/19033
    Version
    No full-text in the repository
    Citation
    Khan MI, Almesfer MK, Danish M et al (2019) Potential of Saudi natural clay as an effective adsorbent in heavy metals removal from wastewater. Desalination and Water Treatment. 158: 140-151.
    Link to publisher’s version
    https://doi.org/10.5004/dwt.2019.24270
    Type
    Article
    Collections
    Engineering and Informatics Publications

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