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- 저자 : Adarsh Bhat (검색결과 2 건)
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Adarsh Bhat,Maithri Venkat,Xiaoyin Chen,Hiroko Ohtani,Kevin Ellwood,Tony Misovski,Johannes W. Schwank 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
This study elucidates the factors responsible for the deterioration of beaded activated carbon (BAC), usedin the abatement of volatile organic compounds that stem from painting processes in industries. In practice,continuous use of adsorbents during periodic adsorption–desorption results in the formation of heel(non-desorbable polymeric complex) in its pore structures, rendering the adsorbent eventually unusable. Here, the adsorption–desorption characteristics of VOCs from porous BAC are investigated, and an effectivesurface modification strategy is developed to impede heel formation and extend the operational lifeof the BAC. This modification protocol increases porosity by up-to 55 % and modifies the functionalgroups on the BAC surface without altering its structural integrity. Consequently, the adsorption capacityof the BAC increased by nearly 38% while decreasing the peak desorption temperature by as much as50 C due to lowered adsorption strength. Additionally, to provide mechanistic insights, the resultantchanges in porosity, surface morphology, and adsorption–desorption characteristics of the BAC are investigatedby N2 physisorption, SEM, TGA, and DRIFTS. Finally, cyclic adsorption–desorption studies conductedunder conditions mirroring the industrial setup proved that the percentage heel accumulationin surface modified BAC is significantly lower ( 3%) compared to unmodified BAC.
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Impedance spectroscopic study of biodegradable PVA/PVP doped TBAI ionic liquid polymer electrolyte
S. Adarsh Rag,DURAISAMI DHAMODHAR-AN,M. Selvakumar,Somashekara Bhat,Shounak De,Hun-Soo Byun 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
This work aims to understand the ion conduction mechanism in polymer electrolyte membranes. Polyvinyl alcohol and polyvinyl pyrrolidone are chosen as polymer matrix and tetrabutylammoniumiodideas the ionic liquid among various synthetic polymers. Four samples named A-1, A-2, A-3, andA-4 have been synthesized by various concentrations and characterized the membranes through impedancespectroscopy analysis which uncovers the conductivity features of the electrolyte. Out of the foursamples, the one with 25 wt.% ionic liquid sample shows better performance than the rest of the samples. The prepared membrane was analysed and understood various parameters such as impedance analysis,dielectric constant, dielectric loss, and electric modulus. The activation energy was calculated for thesamples A-2, A-3, and A-4, as 0.27 eV, 0.96 eV and 2.97 eV, respectively. The Arrhenius models for carriertransport have been explained to interpret the conduction mechanism in polymer membranes. The presentwork has been focused on studying the effect of tetrabutylammonium-iodide ionic liquid on polyvinylalcohol and polyvinyl pyrrolidone polymer matrix as an electrolyte membrane and thepossibility of using this as an electrolyte membrane in devices such as fuel cells, supercapacitors, andbatteries.
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