Characterization of Room-Temperature Ionic Liquids to Study the Electrochemical Activity of Nitro Compounds

Over the past few years, room-temperature ionic liquid (RTIL) has evolved as an important solvent-cum-electrolyte because of its high thermal stability and excellent electrochemical activity. Due to these unique properties, RTILs have been used as a solvent/electrolyte/mediator in many applications. There are many RTILs, which possess good conductivity as well as an optimal electrochemical window, thus enabling their application as a transducer for electrochemical sensors. Nitroaromatics are a class of organic compounds with significant industrial applications; however, due to their excess use, detection is a major concern. The electrochemical performance of a glassy carbon electrode modified with three different RTILs, [EMIM][BF4], [BMIM][BF4] and [EMIM][TF2N], has been evaluated for the sensing of two different nitroaromatic analytes: 2,6-dinitrotoluene (2,6 DNT) and ethylnitrobenzene (ENB). Three RTILs have been chosen such that they have either a common anion or cation amongst them. The sensory response has been measured using square wave voltammetry (SQWV). We found the transducing ability of [EMIM][BF4] to be superior compared to the other two RTILs. A low limit of detection (LOD) of 1 ppm has been achieved with a 95% confidence interval for both the analytes. The efficacy of varying the cationic and anionic species of RTIL to obtain a perfect combination has been thoroughly investigated in this work, which shows a novel selection process of RTILs for specific applications. Moreover, the results obtained from testing with a glassy carbon electrode (GCE) have been replicated using a miniaturized sensor platform that can be deployed easily for on-site sensing applications.

[1]  Á. Montoya,et al.  Development of a chemiluminescence-based quantitative lateral flow immunoassay for on-field detection of 2,4,6-trinitrotoluene. , 2012, Analytica chimica acta.

[2]  S. Timur,et al.  Ionic Liquids from Biocompatibility and Electrochemical Aspects toward Applying in Biosensing Devices. , 2018, Analytical chemistry.

[3]  Tom Welton,et al.  Room-temperature ionic liquids: solvents for synthesis and catalysis. 2. , 1999, Chemical reviews.

[4]  D. Chand,et al.  Visual colorimetric detection of TNT and 2,4-DNT using as-prepared hexaazamacrocycle-capped gold nanoparticles , 2014 .

[5]  C. Margulis,et al.  Modern Room Temperature Ionic Liquids, a Simple Guide to Understanding Their Structure and How It May Relate to Dynamics. , 2015, The journal of physical chemistry. B.

[6]  A. Saha,et al.  Porous carbon incorporated β-Mo2C hollow sphere: An efficient electrocatalyst for hydrogen evolution reaction , 2018, International Journal of Hydrogen Energy.

[7]  Yu Wang,et al.  Fluorescence quenching of CdSe quantum dots by nitroaromatic explosives and their relative compounds. , 2008, Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.

[8]  M. Walsh,et al.  Development of field screening methods for TNT, 2,4-DNT and RDX in soil. , 1992, Talanta.

[9]  R. Compton,et al.  Electrochemistry in Room Temperature Ionic Liquids: A Review and Some Possible Applications , 2006 .

[10]  Rajagopalan Vijayaraghavan,et al.  Applications of Ionic Liquids in Electrochemical Sensors and Biosensors , 2012 .

[11]  K. Marsh,et al.  Room temperature ionic liquids and their mixtures—a review , 2004 .

[12]  Kenneth R. Seddon,et al.  Ionic liquids. Green solvents for the future , 2000 .

[13]  M. S. Miranda,et al.  CdSe quantum dots capped PAMAM dendrimer nanocomposites for sensing nitroaromatic compounds. , 2011, Talanta.

[14]  Jyh-Myng Zen,et al.  Disposable electrochemical sensor for determination of nitroaromatic compounds by a single-run approach. , 2006, Analytical chemistry.

[15]  D. Jed Harrison,et al.  Permeability of glucose and other neutral species through recast perfluorosulfonated ionomer films , 1992 .

[16]  G. Shi,et al.  Rapid nitroaromatic compounds sensing based on oligopyrene , 2008 .

[17]  A. Mondal,et al.  Defect- and Phase-Induced Acceleration of Electrocatalytic Hydrogen Production by Ultrathin and Small MoS2-Decorated rGO Sheets , 2018, ACS Applied Nano Materials.

[18]  Yufeng Zhang,et al.  MoS2 nanosheets direct supported on reduced graphene oxide: An advanced electrocatalyst for hydrogen evolution reaction , 2017, PloS one.

[19]  He Nan,et al.  Advances of Ionic Liquids in Analytical Chemistry. , 2018, Analytical chemistry.

[20]  Russell Chung,et al.  The design of functionalized silicone polymers for chemical sensor detection of nitroaromatic compounds , 2000 .

[21]  C. Liang,et al.  Ionic liquids: a new class of sensing materials for detection of organic vapors based on the use of a quartz crystal microbalance. , 2002, Analytical chemistry.

[22]  D. Hunt,et al.  Detection of nitroaromatic compounds on coal combustion particles. , 1983, Journal of toxicology and environmental health.

[23]  Ezgi Topçu,et al.  Flexible and Free‐standing PtNLs‐MoS2/Reduced Graphene Oxide Composite Paper: A High‐Performance Rolled Paper Catalyst for Hydrogen Evolution Reaction , 2018, ChemistrySelect.

[24]  A. Vomiero,et al.  Ag2S/MoS2 Nanocomposites Anchored on Reduced Graphene Oxide: Fast Interfacial Charge Transfer for Hydrogen Evolution Reaction. , 2019, ACS applied materials & interfaces.

[25]  Kou-San Ju,et al.  Nitroaromatic Compounds, from Synthesis to Biodegradation , 2010, Microbiology and Molecular Biology Reviews.

[26]  H. Gores,et al.  Fractional Walden Rule for Ionic Liquids: Examples from Recent Measurements and a Critique of the So-Called Ideal KCl Line for the Walden Plot † , 2010 .

[27]  G. Zyryanov,et al.  Chemosensors for detection of nitroaromatic compounds (explosives) , 2014 .

[28]  Xiaoquan Lu,et al.  Pd Nanoparticles on Functionalized Graphene for Excellent Detection of Nitro aromatic Compounds , 2014 .

[29]  Gi-Ra Yi,et al.  A patterned colorimetric sensor array for rapid detection of TNT at ppt level , 2014 .

[30]  Shaojun Dong,et al.  Electrogenerated chemiluminescence from R(bpy)3(2+) ion-exchanged in carbon nanotube/perfluorosulfonated ionomer composite films. , 2004, Analytical chemistry.

[31]  S. Prasad,et al.  Development of ultra-low volume, multi-bio fluid, cortisol sensing platform , 2018, Scientific Reports.

[32]  Xiaoying Huang,et al.  A magnesium MOF as a sensitive fluorescence sensor for CS2 and nitroaromatic compounds , 2014 .

[33]  S. Prasad,et al.  Review—Room-Temperature Ionic Liquids for Electrochemical Application with Special Focus on Gas Sensors , 2020, Journal of The Electrochemical Society.

[34]  Yufeng Zhang,et al.  A Clean and Facile Synthesis Strategy of MoS2 Nanosheets Grown on Multi-Wall CNTs for Enhanced Hydrogen Evolution Reaction Performance , 2017, Scientific Reports.

[35]  A. Klamt,et al.  Room temperature ionic liquids as replacements for conventional solvents – A review , 2002 .

[36]  T. Welton.  Room-Temperature Ionic Liquids. Solvents for Synthesis and Catalysis. , 1999, Chemical reviews.

[37]  X. Bo,et al.  A novel electrochemical sensing platform of JUC-62 metal-organic framework / platelet ordered mesoporous carbon for high selective detection of nitro-aromatic compounds , 2019, Sensors and Actuators B: Chemical.

[38]  T. Romann,et al.  Influence of Iodide Ions Concentration on the Stability of 1-Ethyl-3-methylimidazolium Tetrafluoroborate | Molybdenum Carbide Derived Carbon Electrode Interface , 2017 .

[39]  Ying Liu,et al.  Direct electrochemistry and electrocatalysis of horseradish peroxidase immobilized in Nafion-RTIL composite film , 2007 .

[40]  H. Gu,et al.  In situ synthesis of MoS2/graphene nanosheets as free-standing and flexible electrode paper for high-efficiency hydrogen evolution reaction , 2018, RSC advances.

[41]  Meaghan E Germain,et al.  Optical explosives detection: from color changes to fluorescence turn-on. , 2009, Chemical Society reviews.

[42]  J. Nah,et al.  Catalytic synergy effect of MoS2/reduced graphene oxide hybrids for a highly efficient hydrogen evolution reaction , 2017 .

[43]  Wei Chen,et al.  Nitrogen and sulfur co-doped graphene nanoribbons: A novel metal-free catalyst for high performance electrochemical detection of 2, 4, 6-trinitrotoluene (TNT) , 2018 .

[44]  Mohammad Hasanzadeh,et al.  Room-temperature ionic liquid-based electrochemical nanobiosensors , 2012 .

[45]  Jin-Song Hu,et al.  Electrochemical sensor for detecting ultratrace nitroaromatic compounds using mesoporous SiO2-modified electrode. , 2006, Analytical chemistry.

[46]  Manoj Kumar,et al.  Triphenylene derivatives: chemosensors for sensitive detection of nitroaromatic explosives. , 2013, Dalton transactions.

[47]  Dong Sung Choi,et al.  Molybdenum sulfide/N-doped CNT forest hybrid catalysts for high-performance hydrogen evolution reaction. , 2014, Nano letters.