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Wet Chemical Colorimetric Estimation of CO: An Update on the Reduced Silver Sol Spectral and Kinetic Transformations to Silver nanoparticle
Authors:Ghasi Ram Dey  Rajib Ganguly  Tomi Nath Das
Affiliation:1. Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
2. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
Abstract:
Measurements of ppm (v/v) level COg concentration is conveniently performed by its preconcentration in alkaline absorber solution of Ag+-(4)- HCO2-C6H4-SO2NH2 complex, followed by a spectral measurement of the reduced silver sol. In this study, the transitory nature of this latter species and its subsequent real-time transformation to silver nanoparticle are presented. These results were based on spectral measurements made under varying concentrations of alkali, (4)-HCO2-C6H4-SO2NH2, and Ag+ in the absorber solution, and in the presence of a wide range of sampled COg concentration. The initially created light yellow colored sol with its broad absorption profile peaking at 380 nm and absorption coefficient 3500?±?300 cm?1 M?1 (related to the amount of sampled [COg] as standardized by gas chromatographic analysis) changed into the characteristic yellow orange nanoparticle with its plasmon band peak absorption at 425 nm and absorption coefficient 6350?±?300 cm?1 M?1. Under different sampling conditions, the respective first-order conversion rates varied between 0.03 and 0.15 h?1, whereas simultaneous dynamic light scattering measurements revealed steady growth of the averaged particle size ranging from 60 to 300 nm.
Keywords:
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