The effects of time, temperature, and concentration on Sr2+ exchange in clinoptilolite in aqueous solutions
The effects of time, temperature, and concentration on Sr2+ exchange in clinoptilolite in aqueous solutions
复制标题
时间、温度和浓度对水溶液中斜发沸石 Sr2 交换的影响
DOI：
10.2138/am-2001-0406
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Gunter
中科院分区：
文献类型：
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作者：
J. Palmer;M. Gunter
将4g富含斜发沸石的岩石粉碎至-180目，在去离子水（DI）和0.1、0.01和0.001 M SrCl 2·6 H2O溶液中于5、21、50和90 °C交换0.5、5、24和240 h，得到64个样品溶液，将其真空过滤以除去固体。通过ICP-AES分析溶液的流出阳离子（即，Na+、K+、Ca 2+和Mg 2+）。预期较高摩尔浓度的溶液比DI或较低摩尔浓度的溶液含有更高浓度的流出阳离子。所有浓度样品中的一价和二价阳离子均表现出这种趋势。随着时间和温度的增加，流出的一价阳离子交换的程度更大。在低温下交换的0.01和0.001 M浓度的传出二价阳离子比在高温下交换的溶液含有更大浓度的传出二价阳离子。一价阳离子的浓度在0.001 M样品中略高于DI，而二价阳离子在0.001 M和DI处理之间具有相似的浓度。在较高温度下，斜发沸石中的阳离子的整体交换是有利的。
Abstract Four grams of a clinoptilolite-rich rock, crushed to -180 mesh, were exchanged in deionized water (DI), and in 0.1, 0.01, and 0.001 M solutions of SrCl2·6H2O at 5, 21, 50, and 90 °C for 0.5, 5, 24, and 240 h yielding 64 sample solutions, which were vacuum-filtered to remove solids. The solutions were analyzed by ICP-AES for the outgoing cations (i.e., Na+, K+, Ca2+, and Mg2+). The higher molarity solutions were expected to contain greater concentrations of the outgoing cations than the DI or lower molarity concentration solutions. This trend was exhibited by the monovalent and divalent cations in samples of all concentrations. Outgoing monovalent cations exchanged to greater extents with increasing time and temperature. Outgoing divalent cations of 0.01 and 0.001 M concentrations exchanged at low temperatures contained greater concentrations of outgoing divalent cations than solutions exchanged at high temperatures. The concentrations of the monovalent cations were slightly greater in the 0.001 M sample than in DI, whereas divalent cations had a similar concentration between the 0.001 M and DI treatments. Overall exchange of cations out of the clinoptilolite was favored at higher temperatures.