Journal
RENEWABLE ENERGY
Volume 142, Issue -, Pages 11-19Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.04.097
Keywords
Coffee-shell activated carbon; Activation temperature; Activation time; Mass ratio; Water vapor adsorption; Pore development
Funding
- National Natural Science Foundation of China [51566017]
- Yunnan Province Education Department Scientific Research Foundation Project [2018Y036]
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Coffee-shell activated carbon was prepared by a two-step activation method including carbonization process and potassium hydroxide (KOH) activation process. The influences of activation temperature, activation time and mass ratio of KOH to char on activated carbon water vapor adsorption performance were investigated by single factor design. The optimum preparation conditions of activated carbon with large adsorption capacity were determined. The water vapor adsorption experiments of activated carbon were carried out under 70% relative humidity and adsorption temperature of 298 K. Pore structure characteristics were studied via N-2 adsorption-desorption isotherm. The results show that the optimum preparation conditions are activation temperature of 1073 K, activation time of 10 min and mass ratio of KOH to char of 3:1. The Brunauer-Emmett-Teller (BET) specific surface area, total pore volume and water vapor adsorption capacity of the optimum coffee-shell activated carbon are 2349 m(2)/g, 1.036 cm(3)/g and 0.7409 g/g, respectively. All isotherms are type I with narrow pore size distributions in micropore region. Moreover, the obtained activated carbon was characterized by pH, elemental analysis and Fourier transform Infrared (FT-IR) spectroscopy. The results show that the obtained activated carbon would be one of the potential adsorbents for dehumidification in solar energy drying system. (C) 2019 Elsevier Ltd. All rights reserved.
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