Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution
Zeolite Adsorption of Chloride from a Synthetic Alkali-Activated Cement Pore Solution
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DOI：
10.3390/ma12122019
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发表时间：
2019-06-02
期刊：
影响因子：
3.4
通讯作者：
Srubar, Wil V., III
中科院分区：
文献类型：
--
作者：
Osio-Norgaard, Jorge;Srubar, Wil V., III
这项工作提供了实验证据，证实了两种特定的沸石，即chahabazite和faujasite（笼型尺寸为2-13埃），从合成碱活化水泥（AAC）孔隙溶液中吸附少量氯化物的潜力。四种合成沸石首先暴露于氯化的AAC孔溶液中，两种faujasite沸石（即FAU， X-13）， chacha沸石（即SSZ-13）和钠稳定的丝光沸石（即na -丝光沸石）。随后分别通过x射线衍射（XRD）和能量色散x射线光谱（WDS）和波长色散x射线光谱（WDS）研究了矿物学和化学成分。暴露于氯化AAC孔溶液后，FAU和SSZ-13表现出衍射模式的变化（即峰移和展宽），这是沸石铝硅酸盐框架内离子夹持的特征。WDS的元素测绘证实了少量氯元素的存在。结果表明，沸石的氯化物承载能力可能取决于微观结构特征（例如笼型尺寸）和化学成分。
This work presents experimental evidence that confirms the potential for two specific zeolites, namely chabazite and faujasite (with a cage size 2-13 angstrom), to adsorb small amounts of chloride from a synthetic alkali-activated cement (AAC) pore solution. Four synthetic zeolites were first exposed to a chlorinated AAC pore solution, two faujasite zeolites (i.e., FAU, X-13), chabazite (i.e., SSZ-13), and sodium-stabilized mordenite (i.e., Na-Mordenite). The mineralogy and chemical composition were subsequently investigated via X-ray diffraction (XRD) and both energy- and wavelength-dispersive X-ray spectroscopy (WDS), respectively. Upon exposure to a chlorinated AAC pore solution, FAU and SSZ-13 displayed changes to their diffraction patterns (i.e., peak shifting and broadening), characteristic of ion entrapment within zeolitic aluminosilicate frameworks. Elemental mapping with WDS confirmed the presence of small amounts of elemental chlorine. Results indicate that the chloride-bearing capacity of zeolites is likely dependent on both microstructural features (e.g., cage sizes) and chemical composition.