Removal of Molybdenum (VI) from Mine Tailing Effluents with the Aid of Loessial Soil and Slag Waste

    Authors

    J. J. Lian; S. G. Xu; N. B. Chang; C. W. Han;J. W. Liu

    Comments

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    Abbreviated Journal Title

    Environ. Eng. Sci.

    Keywords

    adsorption; cinder; molybdate; sorption media; steel slag; wastewater; AQUEOUS-SOLUTION; HEAVY-METALS; COIR PITH; ADSORPTION; MOLYBDATE; SORPTION; WATER; IRON; TETRATHIOMOLYBDATE; SPECTROPHOTOMETRY; Engineering, Environmental; Environmental Sciences

    Abstract

    Removal of heavy metals from mine tailing effluent has been a long-standing environmental management issue in the mining industry. This article aims to investigate molybdenum [Mo(VI)] removal by waste slag, which has not been fully tested. In this study, the removal efficiencies of Mo(VI) from aqueous solutions by desulfurization steel slag (DSS), converter steel slag (CSS), and cinder (CI) were examined and compared against that of loessial soil (LS). Results showed that the sorption isotherms fitted the Langmuir model well, and the Langmuir adsorption capacity (Q(0)) of the four sorption media generally complied with the following order: DSS > CSS > CI > LS. Adsorption reaction was found to follow the pseudo-second-order rate, and the adsorption of Mo(VI) was sensitive to pH values. The four adsorbents exhibited a significant Mo(VI) removal at low pH values (e.g., pH 3-4.5), but such adsorption decreased rapidly when pH was > 5; little adsorption occurred when the pH value was > 8. The competitive effect of PO43- and SO42- with Mo(VI) for adsorption associated with the four sorption media followed the order LS > CI > CSS > DSS, and moreover, the effect of PO43- on the adsorption of Mo(VI) was observed to be stronger than that of SO42-. Desorption capacity of the four sorption media generally complied with the following order: LS > CI > CSS > DSS.

    Journal Title

    Environmental Engineering Science

    Volume

    30

    Issue/Number

    5

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    213

    Last Page

    220

    WOS Identifier

    WOS:000319114400002

    ISSN

    1092-8758

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