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    Volume 45, Issue 1 (January 2017)

    Special Issue Paper

    Sorptive Response of Chromium (Cr+6) and Mercury (Hg+2) From Aqueous Solutions Using Chemically Modified Soils

    (Received 2 February 2016; accepted 8 September 2016)

    Published Online: 2017

    CODEN: JTEVAB

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    Abstract

    The presence of xenobiotic (human induced) chemicals from mining, refining and electroplating industries causes significant damage to the natural soil system, altering its physico-chemical geochemistry. Most of these chemicals contain metal pollutants that are non-biodegradable and the only way to contain or limit their movement is through sorption. In this study, the sorptive response of two most commonly found metal contaminants, hexavalent chromium (Cr+6) and mercury (Hg+2), were studied using two semi-arid soils from Saudi Arabia. To enhance their retention capacity, these soils were amended with lime. The response to sorption at varying initial contaminant concentrations, pH conditions, temperature levels, and dilution ratios was investigated. Relying on empirical models (Langmuir and Freundlich), the nature of sorption (monolayer or heterogeneous) was ascertained. Furthermore, kinetic models were employed to validate the type and nature of sorption occurring (whether pseudo first-order or second-order). It was found that the experimental results correlated well with the selected empirical models for both the Al-Ghat and Al-Qatif soils when amended with lime and attenuate Cr and Hg to satisfactory levels. The R2 values were close to 1 for all the tested models. The order of sorption was Cr > Hg for heavy metals considered, and also for soils and soil mixtures considered Al-Qatif soil amended with 6 % lime > Al-Ghat soil with 6 % lime > Al-Qatif > Al-Ghat. Lime treated soils sorbed 69 % and 63 % more than the untreated soils for Cr and Hg, respectively.


    Author Information:

    Moghal, A. A. B.
    Bugshan Research Chair in Expansive Soils, Dept. of Civil Engineering, College of Engineering, King Saud Univ., Riyadh,

    Reddy, K. R.
    Dept. of Civil and Materials Engineering, Univ. of Illinois at Chicago, Chicago, IL

    Abu Sayeed Mohammed, S.
    Dept. of Civil Engineering, HKBK College of Engineering, Bangalore,

    Ali Al-Shamrani, M.
    Bugshan Research Chair in Expansive Soils, Dept. of Civil Engineering, College of Engineering, King Saud Univ., Riyadh,

    Zahid, W. M.
    Dept. of Civil Engineering, College of Engineering, King Saud Univ., Riyadh,


    Stock #: JTE20160066

    ISSN:0090-3973

    DOI: 10.1520/JTE20160066

    Author
    Title Sorptive Response of Chromium (Cr+6) and Mercury (Hg+2) From Aqueous Solutions Using Chemically Modified Soils
    Symposium ,
    Committee D04