کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
149894 456440 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Montmorillonite modified with hexadecylpyridinium chloride as highly efficient anion exchanger for perchlorate ion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Montmorillonite modified with hexadecylpyridinium chloride as highly efficient anion exchanger for perchlorate ion
چکیده انگلیسی

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 HPO42− < SO42− < NO3− < ClO4− 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.

Na-montmorillonite modified with hexadecylpyridinium chloride showed high selectivity for ClO4− from multi-anion solution: HPO42− < SO42− < NO3− < ClO4−, similar to the Hofmeister series of anions based on free energy of hydration.Figure optionsDownload as PowerPoint slideHighlights
► The montmorillonite modified with hexadecylpyridinium chloride was investigated.
► The material was highly selective for ClO4− at low concentration (0.10 mmol/dm3).
► The selectivity sequence was HPO42− < SO42− < NO3− < ClO4−.
► The material exhibited high ClO4− uptake (0.70–0.82 mmol/g) at pH 4–10.
► Langmuir isotherm type for ClO4− uptake with capacity of 1.0 mmol/g was reported.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 191, 15 May 2012, Pages 141–146
نویسندگان
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