کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1165827 1491092 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluating the complexation behavior and regeneration of boron selective glucaminium-based ionic liquids when used as extraction solvents
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Evaluating the complexation behavior and regeneration of boron selective glucaminium-based ionic liquids when used as extraction solvents
چکیده انگلیسی

Glucaminium-based ionic liquids are a new class of solvents capable of extracting boron-species from water with high efficiency. The complexation behavior of these ILs with borate was thoroughly studied using 11B NMR. Two different complexes, namely, monochelate complex and bischelate complex, were observed. 11B NMR was used extensively to determine the formation constants for monochelate and bischelate complexes. The IL concentration was observed to have a significant effect on the IL–borate complexes. Using an in situ dispersive liquid–liquid microextraction (in situ DLLME) method, the extraction efficiency for boron species was increased dramatically when lithium bis[(trifluoromethyl)sulfonyl]imide (LiNTf2) was used as the metathesis salt in an aqueous solution containing 0.1 M sodium chloride. IL regeneration after extraction was achieved using 0.1 M hydrochloric acid. The extraction efficiency of boron species was consistent when the IL was employed after three regeneration cycles. The selectivity of the IL for boron species in synthetic seawater samples was similar to performing the same extraction from Milli-Q water samples.

Figure optionsDownload as PowerPoint slideHighlights
► Glucaminium-based ILs exhibit high selectivity for boron species using DLLME.
► The concentration of glucaminium-based IL affects type of boron complex formed.
► Use of 0.1 M HCl allows for regeneration of the IL solvent following extraction.
► Selectivity of the glucaminium-based ILs for boron species in seawater is similar to Milli-Q water.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 740, 31 August 2012, Pages 66–73
نویسندگان
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