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水锌矿(Zn5(CO3)2(OH)6)对 Pb 的吸收——修复的意义。

Uptake of Pb by hydrozincite, Zn5(CO3)2(OH)6--implications for remediation.

机构信息

Dipartimento di Scienze della Terra, Università di Cagliari, via Trentino 51, I-09127 Cagliari, Italy.

出版信息

J Hazard Mater. 2010 May 15;177(1-3):1138-44. doi: 10.1016/j.jhazmat.2009.12.026. Epub 2009 Dec 16.

Abstract

Hydrozincite, Zn(5)(CO(3))(2)(OH)(6), periodically precipitates from heavy metal contaminated waters of the Rio Naracauli stream, Sardinia, in association with a biological photosynthetic community. The precipitation removes not only zinc from the waters, but also other toxic "heavy metals", such as Cd, Cu, Pb. The phenomenon is therefore of potential interest for "soft" remediation of contaminated waters. Previous cation exchange experiments suggested that binding of Pb to hydrozincite is fairly strong. This suggestion is in agreement with new release tests in deionized water and X-ray absorption spectroscopy (XAS) spectra collected at the Pb L(III) edge for natural hydrozincites from Naracauli, and synthetic Pb-doped hydrozincites. The results suggest that, up to bulk concentration of 1.5 wt.% Pb, uptake of this metal occurs in two distinct ways: (1) as a substitution for Zn in the tetrahedral site of the hydrozincite structure, possibly via formation of a surface mononuclear tridentate inner sphere complex; (2) as an ill-defined, presumably amorphous, phase with a local atomic structure similar to cerussite. These data support the concept that Pb binding to hydrozincite is strong enough to make this mineral a potential sink for the metal.

摘要

纤锌矿,Zn(5)(CO(3))(2)(OH)(6),周期性地从撒丁岛纳卡拉利溪流的重金属污染水中沉淀出来,与生物光合作用群落有关。这种沉淀不仅从水中去除锌,还去除其他有毒的“重金属”,如 Cd、Cu、Pb。因此,这种现象对于受污染水的“软性”修复具有潜在的意义。以前的阳离子交换实验表明,Pb 与纤锌矿的结合相当强。这一建议与在去离子水中进行的新释放测试以及在 Pb L(III)边缘收集的天然纳卡拉利纤锌矿和合成 Pb 掺杂纤锌矿的 X 射线吸收光谱 (XAS) 谱一致。结果表明,在高达 1.5wt.%Pb 的体浓度下,这种金属的摄取以两种不同的方式发生:(1)作为 Zn 在纤锌矿结构的四面体位置上的取代,可能通过形成表面单核三齿内球络合物;(2)作为一种不明确的、可能是非晶态的相,其局部原子结构类似于白铅矿。这些数据支持了 Pb 与纤锌矿结合很强的概念,使这种矿物成为该金属的潜在汇。

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