Phyllosilicate minerals are relevant in several environmental applications, such as supplementary cementitious materials, carbon capture and storage, and nuclear waste disposal. Therefore, it is important to understand how phyllosilicates react with aqueous solutions and the components within the solutions. In this study, the interaction between ethylenediamine and the surface of milled phlogopite was investigated within a pH range of 4–13. X-ray diffraction analysis of raw and milled phlogopite sample was conducted prior to the experiments. Solution compositions after batch titration experiments were determined using inductively coupled plasma optical emission spectrometry, and the remaining phlogopite was analyzed using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, zeta potential, and thermogravimetry/differential thermal analysis. The results indicate that the combined effect of HNO3—used to control the pH—and the presence of ethylenediamine improves phlogopite dissolution at pH 4. Conversely, the maximum accumulation of ethylenediamine at pH 7 inhibits the dissolution and blocks the phlogopite surface. At pH 10 and 13, ethylenediamine exhibits predominantly neutral and negative charges, respectively. This charge distribution indicates a lack of significant interaction with the negatively charged phlogopite surface, however despite that, ethylenediamine accumulated Al, Mg, and Fe on the surface.

中文翻译：

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金云母在 pH 4–13 乙二胺存在下的溶出度和表面研究


叶状硅酸盐矿物与多种环境应用相关，例如补充胶凝材料、碳捕获和储存以及核废料处理。因此，了解层状硅酸盐如何与水溶液和溶液中的成分反应非常重要。在这项研究中，在 4-13 的 pH 值范围内研究了乙二胺与研磨金云母表面之间的相互作用。实验前对原始和研磨的金云母样品进行 X 射线衍射分析。采用电感耦合等离子体发射光谱法测定批量滴定实验后的溶液成分，并使用 X 射线光电子能谱、傅里叶变换红外光谱、zeta 电位和热重/差热分析分析剩余的金云母。结果表明，用于控制 pH 值的 HNO3 和乙二胺的存在的综合作用改善了 pH 值为 4 时的金云母溶解。相反，乙二胺在 pH 7 时的最大积累抑制了溶解并阻塞了金云母表面。在 pH 值 10 和 13 时，乙二胺分别主要表现出中性电荷和负电荷。这种电荷分布表明与带负电荷的金云母表面缺乏显着的相互作用，但尽管如此，乙二胺还是在表面积累了 Al、Mg 和 Fe。