Mg metal (zero-valent magnesium, ZVMg, Mg<sup>0</sup>) is currently of interest as a strong reductant of environmental contaminants. Developing a cost-effective means of ZVMg utilization is one of the most critical issues for the practical application of ZVMg in the contaminant treatment processes. We obtained metallic Mg milling scraps (MS-ZVMg) from a die casting factory and compared the reactivity with those of three reagent-grade ZVMg (RG-ZVMg) particles using Cr(VI) as a model contaminant. Batch experiments were conducted by reacting 1.0 g/L of the MS-ZVMg or the other three RG-ZVMg particles from different commercial vendors with 19.5 μM Cr(VI) at the initial pH of 6.24 ± 0.15 in the presence of the atmospheric oxygen. The MS-ZVMg effectively reduced Cr(VI) within 24 h and showed competent reactivity compared to those of the RG-ZVMg. Sonication of MS-ZVMg substantially enhanced its reactivity by about 3 times but not those of RG-ZVMg particles. FT-IR analysis of the ZVMg particles suggested that the removal of residual lubricant oil from the surface of MS-ZVMg particles was accounted for the increasing reactivity. In addition, sonication effectively sustained the reactivity of every type of ZVMg particles up to 6 cycles. The increasing reactivity of MS-ZVMg was also achieved by washing it with an organic solvent. Our results successfully demonstrated the potentiality of practical and cost-effective application of ZVMg in the treatment processes of contaminants.<br/>

Potential application of metallic Mg milling scraps as a green and powerful contaminant reductant

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.