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http://dx.doi.org/10.9713/kcer.2022.60.3.377

A Study on Moisture Adsorption Capacity by Charcoals  

Kim, Dae Wan (Department of Carbon Convergence Engineering, Jeonju University)
An, Ki Sun (Department of Carbon Convergence Engineering, Jeonju University)
Kwak, Lee Ku (Department of Carbon Convergence Engineering, Jeonju University)
Kim, Hong Gun (Department of Carbon Convergence Engineering, Jeonju University)
Ryu, Seung Kon (Department of Carbon Convergence Engineering, Jeonju University)
Lee, Young Seak (Department of Applied chemical Engineering, Chungnam National University)
Publication Information
Korean Chemical Engineering Research / v.60, no.3, 2022 , pp. 377-385 More about this Journal
Abstract
Surface morphology and adsorption characteristics of charcoals prepared from Korean traditional kiln were analyzed, and their moisture adsorption capacities were examined with respect to humidity and temperature change. Moisture adsorption capacities of red-clay powder, activated carbon fiber fabric (ACF fabric) and activated carbon fiber paper(ACF paper) were also examined to compare with those of charcoals. Moisture adsorption capacity of charcoal was low less than 45% humidity due to its hydrophobic property, but it slowly and linearly increased as increasing the humidity. Moisture adsorption capacity of red-clay powder was similar to charcoal at low level humidity, it increased exponentially as increasing the humidity showing Type V adsorption isotherm. Therefore, the weather forecast annal prepared by employee of weather centre in Joseon Dynasty is experimentally approved. ACF fabric and ACF paper show excellent moisture adsorption capacities, which can be used to humidity measuring sensor. Adsorption isotherm of charcoal slice was peculear showing the mixed Type I and Type IV due to low-pressure hysteresis that was occurred from embedment of nitrogen in crevice of charcoal. The specific surface area of charcoal increased by grinding charcoal slice to powder, resulted in increasing the desorption amount of adsorbent at low relative pressure.
Keywords
Charcoal; Red-clay; Humidity; Activated carbon fiber; Adsorption isotherm;
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