کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6600928 1423969 2018 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Monoethanolamine-enabled electrochemical detection of H2S in a hydroxyl-functionalized ionic liquid
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Monoethanolamine-enabled electrochemical detection of H2S in a hydroxyl-functionalized ionic liquid
چکیده انگلیسی
There is much interest in developing electrochemical sensors for H2S detection using room temperature ionic liquids as electrolytes. To this end, this study compared the electrochemical behavior at a Pt-microdisk electrode of H2S in [Bmim]BF4, [C3OHmim]BF4, and MEA-[C3OHmim]BF4 (1:6.2 M ratio) using cyclic voltammetry. In both [Bmim]BF4 and [C3OHmim]BF4, the electrochemical oxidation/reduction of H2S requires too high/low a potential (about 1.5/− 1.6 V vs. Ag/Ag+), and these ionic liquids are therefore unsuitable for H2S detection. Addition of monoethanolamine (MEA) to [C3OHmim]BF4 significantly increases the H2S absorption capacity through the chemical reaction between MEA and H2S. This chemical absorption enhances the electrochemical response of H2S, in particular generating electroactive HS− ions that lead to an additional and independent anodic peak at around − 0.4 V vs Ag/Ag+ which is suitable for H2S sensing. There is a good linear relationship between the peak current and H2S content in the tested range (60-210 ppm). Moreover, electroactive ambient gases such as CO2 and SO2 show no response at the potentials of HS− oxidation, so do not interfere with H2S detection. Our findings reveal a new kind of ionic liquid electrolyte for the detection of H2S gas with high sensitivity and selectivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 88, March 2018, Pages 93-96
نویسندگان
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