A Smart Colorimetric Platform for Detection of Methanol, Ethanol and Formic Acid

Abstract

Carbon dioxide (CO2) is a greenhouse gas in the atmosphere and scientists are working on converting it to useful products, thereby reducing its quantity in the atmosphere. For converting CO2, different approaches are used, and among them, electrochemistry is found to be the most common and more efficient technique. Current methods for detecting the products of electrochemical CO2 conversion are time-consuming and complex. To combat this, a simple, cost-effective colorimetric method has been developed to detect methanol, ethanol, and formic acid, which are formed electrochemically from CO2. In the present work, the highly efficient sensitive dyes were successfully established to detect these three compounds under optimized conditions. These dyes demonstrated excellent selectivity and showed no cross-reaction with other products generated in the CO2 conversion system. In the analysis using these three compounds, this strategy shows good specificity and limit of detection (LOD, ~0.03–0.06 ppm). A cost-effective and sensitive Internet of Things (IoT) colorimetric sensor prototype was developed to implement these dyes systems for practical and real-time application. Employing the dyes as sensing elements, the prototype exhibits unique red, green, and blue (RGB) values upon exposure to test solutions with a short response time of 2 s. Detection of these compounds via this new approach has been proven effective by comparing them with nuclear magnetic resonance (NMR). This novel approach can replace heavy-duty instruments such as high-pressure liquid chromatography (HPLC), gas chromatography (G.C.), and NMR due to its extraordinary selectivity and rapidity.

A smartphone-interfaced, low-cost colorimetry biosensor for selective detection of bronchiectasisviaan artificial neural network

“…21 The solutions of potassium permanganate (KMnO 4 ) and eosin blue were also prepared in DI water at a concentration of 3 mM. The pH effect of the test analyte with eosin blue, KMnO 4 and silver nanowire dispersed starch iodine (SI) dyes was analyzed in acidic (2,4,6), neutral, and basic (9, 12) solutions. Each dye solution (10 mL) was added with 1 mL of 0.3 ppm H 2 O 2 solution in the adjusted pH.…”

“…To evaluate the applicability of the proposed sensor prototype, comparisons were made concerning heavy-duty instruments like the NMR spectrometer. 4 The solution employed in the NMR experiments of H 2 O 2 breakdown contains 75% (v/v) acetonitrile, and the rest is methanol. 3.1 mL of solvent, 5.0 mL of H 2 O 2 , and 10 mL of chloroform were combined in a 5 mL reaction vial, and 463 mL of this mixture was placed in a precision NMR tube.…”

“…Breath analysis is done by either monitoring EB in the gas phase or tracking it in the aqueous phase. 4,5 Hydrogen peroxide (H 2 O 2 ) is an excellent example and one of the crucial markers in treating numerous diseases. 6 The EB of people with asthma, systemic inammation, chronic obstructive pulmonary disease (COPD), acute respiratory distress syndrome (ARDS), bronchiectasis, systemic sclerosis, cystic brosis, systemic inammation, uremia, and pneumonia have elevated levels of H 2 O 2 (see Table 1).…”

A paper-based colourimetric sensor for sodium sulfite detection in beverages

“…Where m is the calibration plot's slope, and σ is the intercept's standard deviation [16,[20][21][22][23].…”

An efficient transition metal chalcogenide sensor for monitoring respiratory alkalosis

“…Human exhaled breath can be a useful indicator for various issues in our respiratory system and can be used to detect various diseases and conditions. (Sha et al 2022a , b , c ; Sha et al 2022a , b ; Geetha et al 2022 ) The body's numerous cellular functions produce CO 2 as a metabolic byproduct, and it has some systems to control carbon dioxide levels. (Issitt et al 2022 ) One is an acid–base buffering mechanism that balances carbon dioxide and bicarbonate levels.…”