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用重金属酸盐修饰的酸水合物的结构研究

M Król¹, P Florek¹, M Marzec²

¹Faculty of Materials Science and Ceramic, AGH University of Krakow, 30 Mickiewicza Av., 30-059 Kraków, POLAND.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy

|June 21, 2024

概括

这项研究揭示了-酸盐-酸盐 (C-S-H) 阶段如何使和等重金属不运动. 机制包括降水和离子交换,这对环境修复至关重要.

科学领域:

材料科学材料科学材料科学
环境化学环境化学
地质化学地质化学

背景情况:

重金属污染对环境和健康构成重大风险.
-酸盐-酸盐 (C-S-H) 阶段是水泥材料中的关键组成部分,并有可能对污染物进行隔离.
了解固定化机制对于制定有效的补救策略至关重要.

研究的目的:

研究各种重金属离子在合成C-S-H相中的固定机制.
为了阐明重金属合并后C-S-H的结构和形态变化.
确定不同重金属在C-S-H结构中的特定作用.

主要方法:

通过沉合成C-S-H相,其中包含重金属离子 (Pb (II),Cd (II),Ni (II),Zn (II),Cr (III)).
使用富里埃变换红外 (FT-IR) 光谱,拉曼光谱,X射线光电子光谱 (XPS) 和X射线衍射 (XRD) 的结构性表征.
使用扫描电子显微镜 (SEM) 和传输电子显微镜 (TEM) 的形态分析.

主要成果:

确定了多种重金属固定机制:不溶性化合物 (Ni(II),Cr(III) 的沉,酸盐结构中的Ca(II) 离子替代 (Cd(II),Ni(II),Zn(II) 和直接与C-S-H结构的结合 (Pb(II)).
光谱和显微分析证实了由于金属的加入而导致的C-S-H的结构变化和聚合度变化.
观察到不同的重金属离子体有不同的固定通路.

结论:

C-S-H 阶段表现出各种固定重金属的机制,为环境修复应用提供了潜力.
具体的固定机制取决于所涉及的重金属离子的类型.
这项研究为重金属与C-S-H的相互作用提供了基本的见解,为未来的污染物控制材料设计提供了信息.

关键词:

无形凝是一种无形的凝.C-S-H 在线阅读重金属离子重金属离子固定化固定化固定化

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