AI Article Synopsis
- Clay minerals, particularly natural serpentine, are effective in treating sewage with heavy metals like zinc and cadmium.
- Mechanochemical activation significantly enhances serpentine's chemical reactivity, allowing for efficient separation of Zn(Ⅱ) and Cd(Ⅱ) ions.
- By optimizing parameters like grinding intensity and temperature, the study achieved a 92% separation rate of these metals, highlighting the potential for using activated clay minerals in environmental cleanup and resource recovery.
Article Abstract
Clay minerals are widely used to treat sewage containing heavy metals such as zinc and cadmium. In this study, the chemical reactivity of natural serpentine was signally improved through mechanochemical activation, achieving the efficient separation of Zn(Ⅱ) and Cd(Ⅱ) ions in a mixed solution. The activated serpentine would release a large amount of Mg and OH and thereby selectively precipitate Zn(Ⅱ) ions as an uncommon metamorphic zinc mineral, bechererite, in the presence of SO. By adjusting the parameters including grinding intensity, reaction temperature, serpentine dosage and salt species, the optimum conditions were determined and a 92% separation rate of Zn(Ⅱ) and Cd(Ⅱ) ions was achieved. The mechanochemical activation of natural clay minerals expresses a great potential for purification of heavy metal contaminated sewage, as well as the simultaneous separation and recovery of multi-metal secondary resources.
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| http://dx.doi.org/10.1016/j.chemosphere.2020.127275 | DOI Listing |
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