Microscale investigations of ni uptake by cement using a combination of scanning electron microscopy and synchrotron-based techniques

Vespa M; Dahn R; Gallucci E; Grolimund D; Wieland E; Scheidegger AM

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Microscale investigations of ni uptake by cement using a combination of scanning electron microscopy and synchrotron-based techniques

机译：结合扫描电子显微镜和基于同步加速器的技术对水泥中镍吸收的微观研究

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Cement is used to condition waste materials and for the construction and backfilling of repositories for low-and intermediate-level radioactive waste. In this study, Ni uptake by hardened cement paste has been investigated with the aim of improving our understanding of the immobilization process of Ni(II) in cement on the microscale. Information on the cement microstructure, Ni distribution, Ni concentration, and speciation of the Ni phases formed in the cement system and their association with specific cement minerals has been gained by using scanning electron microscopy (SEM) and synchrotron-based A-X-ray fluorescence (A-XRF) and A-X-ray absorption spectroscopy (A-XAS). The Ni-doped samples were prepared at a water/cement ratio of 0.4 using a sulfate-resisting Portland cement and were hydrated for 30 days. The metal loadings of the system were varied from 50 up to 5000 mg/kg. SEM investigations show that for all metal loadings the Ni phases form rims around inner-calcium silicate hydrates, suggesting a direct association with this cement phase. The A-XAS measurements further reveal that a mixture of Ni phases form at Ni-enriched regions. Data analysis indicates that Ni(II) is predominantly immobilized in a layered double hydroxide-type phase (Ni-Al LDH) and only to a minor extent precipitates as Ni-hydroxides (alpha-Ni(OH)(2) and, beta-Ni(OH)(2)). At 50 mg/kg Ni loading, however, the A-XAS measurements suggest the presence of an additional Ni species. In the latter system Ni-Al LDH is found in Ni-rich regions, whereas at Ni-poor regions an unknown species is formed.

机译：水泥可用于处理废料，以及用于中低放射性废物处置库的建设和回填。在这项研究中，已经研究了硬化水泥浆对镍的吸收，目的是增进我们对微观上将Ni（II）固定在水泥中的过程的理解。通过使用扫描电子显微镜（SEM）和基于同步加速器的AX射线荧光分析（a），可以获得关于水泥微结构，Ni分布，Ni浓度以及在水泥体系中形成的Ni相的形态以及它们与特定水泥矿物的关系的信息。 A-XRF）和AX射线吸收光谱（A-XAS）。使用抗硫酸盐的波特兰水泥以0.4的水/水泥比制备掺Ni的样品，并水合30天。系统的金属负载量从50到5000 mg / kg不等。 SEM研究表明，对于所有金属负载，Ni相均在内部硅酸钙水合物周围形成边沿，表明与该水泥相直接缔合。 A-XAS测量结果进一步表明，在富Ni的区域会形成Ni相的混合物。数据分析表明，Ni（II）主要固定在层状双氢氧化物型相（Ni-Al LDH）中，仅在很小的程度上以氢氧化物（α-Ni（OH）（2）和β- Ni（OH）（2））。但是，在50 mg / kg的Ni负载下，A-XAS测量表明存在其他Ni物种。在后一种系统中，在富镍区域发现了Ni-Al LDH，而在贫镍区域形成了未知的物种。

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来源
《Environmental Science & Technology》 |2006年第24期|p. 7702-7709|共8页
作者
Vespa M; Dahn R; Gallucci E; Grolimund D; Wieland E; Scheidegger AM;
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作者单位

Paul Scherrer Inst, Lab Waste Management, CH-5232 Villigen, Switzerland;

ETH, Dept Environm Sci, Zurich, Switzerland;

Ecole Polytech Fed Lausanne, Construct Mat Lab, IMX, CH-1015 Lausanne, Switzerland;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类环境化学;
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7. Microscale Investigations of Ni Uptake by Cement Using a Combination of Scanning Electron Microscopy and Synchrotron-Based Techniques [O] . -1

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8. Investigation of Cement Pastes and Related Materials by Scanning Electron Microscopy and X-Ray Diffraction. [R] . Mather, K., Hallford, C. R., Burkes, J. P., 1983

机译：用扫描电子显微镜和X射线衍射研究水泥浆及相关材料。

Microscale investigations of ni uptake by cement using a combination of scanning electron microscopy and synchrotron-based techniques

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