School of Environment Science and Resources, Shanxi University, Taiyuan, Shanxi 030006, China; Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, Shanxi 030006, China.
School of Environment Science and Resources, Shanxi University, Taiyuan, Shanxi 030006, China.
Environ Pollut. 2020 Jan;256:113407. doi: 10.1016/j.envpol.2019.113407. Epub 2019 Oct 19.
A composite material comprising of nanoscale zero-valent iron (nZVI) supported on vinegar residue (nZVI@VR) was prepared and applied for remediation of soils contaminated by hexavalent chromium (Cr(VI)). Sedimentation test results revealed that the nZVI@VR displayed enhanced stability in comparison to the bare-nZVI. Remediation experiments exhibited the immobilization efficiency of Cr(VI) and Cr was 98.68% and 92.09%, respectively, when using 10 g nZVI@VR (nZVI 5%) per 200 g Cr-contaminated soil (198.20 mg kg Cr(VI), 387.24 mg kg Cr) after two weeks of incubation. Further analyses demonstrated that almost all the exchangeable Cr was transformed into Fe-Mn oxide bound and organic matter bound. Moreover, the application of nZVI@VR enhanced soil organic carbon content and reduced redox potential. After granulation, the immobilization efficiency of Cr(VI) and Cr achieved 100% and 91.83% at a dosage of 10% granular nZVI@VR. Granular nZVI@VR also accelerated the transform of more available Cr (exchangeable and bound to carbonates) into less available fractions (Fe-Mn oxide bound and organic matter bound), thus resulting in a remarkable reduction in the Cr bioavailability. These results prove that nZVI@VR can be an effective remediation reagent for soils contaminated by Cr(VI).
一种由负载在醋渣上的纳米零价铁（nZVI@VR）组成的复合材料被制备出来，并应用于修复六价铬（Cr(VI)）污染的土壤。沉降试验结果表明，与裸 nZVI 相比，nZVI@VR 具有更高的稳定性。修复实验表明，当使用 10 g nZVI@VR（nZVI 为 5%）修复每 200 g 污染土壤（Cr(VI)含量为 198.20 mg/kg，Cr 含量为 387.24 mg/kg）时，Cr(VI)和 Cr 的固定效率分别为 98.68%和 92.09%，孵育两周后。进一步的分析表明，几乎所有的可交换 Cr 都转化为 Fe-Mn 氧化物结合态和有机结合态。此外，nZVI@VR 的应用提高了土壤有机碳含量并降低了氧化还原电位。经过造粒后，当添加 10%颗粒状 nZVI@VR 时，Cr(VI)和 Cr 的固定效率达到 100%和 91.83%。颗粒状 nZVI@VR 还加速了更多可利用 Cr（可交换态和碳酸盐结合态）向更不可用的形态（Fe-Mn 氧化物结合态和有机结合态）的转化，从而显著降低了 Cr 的生物有效性。这些结果证明 nZVI@VR 可以作为一种有效的修复 Cr(VI)污染土壤的试剂。
