Montmorillonite modified with hexadecylpyridinium chloride as highly efficient anion exchanger for perchlorate ion

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• 作者：Ramesh Chitrakar ; ^{chitrakar-ramesh@aist.go.jp} ; Yoji Makita ; Takahiro Hirotsu ; Akinari Sonoda ; ^{a.sonoda@aist.go.jp}
• 关键词：Montmorillonite ; Hexadecylpyridinium chloride ; Perchlorate ion ; Selectivity ; Uptake
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 May, 2012
• 卷：191
• 期：Complete
• 页码：141-146
• 文件大小：534 K

摘要

Details of the anion-exchange properties of Na-montmorillonite modified with hexadecylpyridinium chloride (HDPyCl-montmorillonite) for perchlorate ions are reported herein. The perchlorate uptake on HDPyCl-montmorillonite from 0.01 mmol/dm³ or 0.10 mmol/dm³ solution rapidly attained equilibrium within 4 h. The perchlorate uptake on HDPyCl-montmorillonite followed the Langmuir isotherm model with capacity of 1.02 mmol/g. The perchlorate uptake of 0.70-0.80 mmol/g on HDPyCl-montmorillonite persisted in a wide pH range of 4-10. High selectivity of HDPyCl-montmorillonite for perchlorate ion was reflected in the high distribution coefficient values (>10⁴ cm³/g) with selectivity sequence of HPO₄^{2鈭?/sup> < SO₄2鈭?/sup> < NO₃鈭?/sup> < ClO₄鈭?/sup> from multi-anion solution of 0.10, 1.0, or 2.0 mmol/dm3. This selectivity sequence corresponded to the sequence of increasing hydration energy of anions. These data revealed that the anion uptake on HDPyCl-montmorillonite accompanied with release of chloride ion into solution through anion-exchange processes.}