کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
743891 894374 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Trace detection of nitroaromatic compounds with layer-by-layer assembled {SBA/PSS}n/PDDA modified electrode
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Trace detection of nitroaromatic compounds with layer-by-layer assembled {SBA/PSS}n/PDDA modified electrode
چکیده انگلیسی

The {SBA/PSS}n/PDDA films modified electrode was prepared by layer-by-layer (LBL) assembly with mesoporous SiO2 (SBA), poly(sodium 4-styrene-sulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDDA) in this paper. SBA is a large pore-size mesoporous material with highly ordered hexagonally arranged mesochannels and high thermal stability etc. The electrochemical characteristics of the {SBA/PSS}n/PDDA films have been studied by electrochemical impedance spectroscopy in 0.1 M KCl solution containing 5.0 mM Fe(CN)63−/Fe(CN)64− at the formal potential of 0.230 V. The ultratrace nitroaromatic compounds (NACs) such as TNT, TNB, DNT and DNB were determined by differential pulse voltammetry (DPV) measurement. The sensitivities for NACs determination with {SBA/PSS}n/PDDA modified electrode were dependent on the number of layers, pH and ionic strength of electrolyte, based on which a set of optimized conditions for film fabrication was inferred. The current responses were linear with NACs ranging from 10−9 to 10−7 mol/l. The results showed that the {SBA/PSS}n/PDDA modified electrode established a new way for fast, simple and sensitive analysis of NACs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 131, Issue 2, 14 May 2008, Pages 432–438
نویسندگان
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