کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7611601 1493518 2015 37 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Anion exchangers with branched functional ion exchange layers of different hydrophilicity for ion chromatography
ترجمه فارسی عنوان
مبدل های آنیونی با لایه های تبادل یون تابشی از هیدرولیکی های مختلف برای کروماتوگرافی یونی
کلمات کلیدی
مبدل آنیون، کروماتوگرافی یونی، پلی (استایرن-دیوینیل بنزن)، تعیین آنیون، گروه های تبادلی یونی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Novel polystyrene-divinylbenzene (PS-DVB) based anion exchangers differing from each other in the structure of the branched functional ion exchange layer are prepared to investigate the role of linker and functional site on ion exchange selectivity. The proposed method of synthesis includes the obtaining of aminated PS-DVB particles by means of their acylation with following reductive amination with methylamine. Further modification of the obtained secondary aminogroups is provided by the alkylation with either 1,4-butanediol diglycidyl ether (1,4-BDDGE) or resorcinol diglycidyl ether (RDGE), which form the linkers of different hydrophobicity, and amination of terminal epoxide rings with trimethylamine (TMA), dimethylethanolamine (DMEA), methyldiethanolamine (MDEA) or triethanolamine (TEA). The variation of the structure and hydrophobicity of the linker and terminal quaternary ammonium sites in the functional layer allows the alteration of selectivity and separation efficiency of the obtained adsorbents. The ion exchange selectivity and separation efficiency of the anion exchangers are evaluated using the model mixtures of anions (F−, HCOO−, Cl−, NO2−, Br−, NO3−, HPO42− and SO42−) in potassium hydroxide eluents. The adsorbents show the decrease of selectivity with increasing the hydrophilicity of the terminal functional site. The anion exchangers having more flexible and hydrophilic 1,4-BDDGE linker provide smaller separation factors for most of the analytes as compared with RDGE-containing adsorbents with the same terminal ion exchange sites, but are characterized with higher column efficiencies and better peak symmetry for polarizable anions. In case of 1,4-BDDGE-modified anion exchangers of the particle size of 3.3 μm functionalized with DMEA and MDEA the calculated values of column efficiencies for polarizable NO3− and Br− are up to 49,000 and 53,000 N/m, respectively, which is almost twice higher than the values obtained for the RDGE-containing analogues.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1408, 21 August 2015, Pages 78-86
نویسندگان
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