Camphor leaf-derived activated carbon prepared by conventional physical activation and its water adsorption profile
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Carbon Letters https://doi.org/10.1007/s42823-020-00204-3
ORIGINAL ARTICLE
Camphor leaf‑derived activated carbon prepared by conventional physical activation and its water adsorption profile Chairunnisa1 · N. Takata1 · K. Thu1,2 · T. Miyazaki1,2 · K. Nakabayashi3 · J. Miyawaki3 Received: 12 May 2020 / Revised: 8 October 2020 / Accepted: 4 November 2020 © Korean Carbon Society 2020
Abstract Preparation of activated carbon from biomass residue with conventional steam activation was conducted to find the alternative raw materials for meeting the high demand for low-cost porous material in the desiccant application. In this study, activated carbons were produced from dead camphor leaves using two-step methods at different preparation temperatures. The characterization results revealed that the prepared activated carbons have a surface area of 700 m2/g, with 75% of microporosity. The water vapor sorption study reported that the water uptake of camphor leaf-based activated carbons was strongly affected by the pore properties of the materials. Moreover, from the water adsorption kinetics, it was observed that the rate constant of adsorption was varied at each relative pressure, which can be assumed that the water adsorption mechanism is different at each relative pressure. From these results, it was revealed that the prepared camphor leaf-based activated carbons have a promising ability to adsorb water vapor from humid air. Keywords Camphor leaves · Steam activation · Activated carbon · Water sorption · Surface properties · Desiccant materials
1 Introduction The need for low-cost material to control the relative humidity in many industrial processes and human life is crucial. Humid air can disturb stability and decrease the quality of industrial products. Among many technologies, removing moisture from the air by desiccant is known as a cheap and practical method. Silica gel [1], zeolites [2], metal–organic frameworks (MOFs) [3], and carbon-based materials [4] have been widely studied as a desiccant material. Among those materials, carbon-based desiccant has promising future Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42823-020-00204-3) contains supplementary material, which is available to authorized users. * Chairunnisa [email protected]‑u.ac.jp 1
Department of Energy and Environmental Engineering, IGSES, Kyushu University, Fukuoka 816‑8580, Japan
2
International Institute for Carbon-Neutral Energy Research, Kyushu University, 744, Motooka, Nishi Ward, Fukuoka 819‑0385, Japan
3
Department of Advanced Device Materials, Institute for Material Chemistry and Engineering, Kyushu University, 6‑1, Kasuga‑koen, Kasuga, Fukuoka 816‑8580, Japan
applications since it has high porosity with various pore sizes and surface functionality. Activated carbon (AC), a traditional carbon-based material, has been used in numerous applications from the environment [5, 6] to pharmacology [7]. The affordability [8], easy preparation, high availability [9], a
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