Dewi Qurrota A’yuni, Hadiantono Hadiantono, Velny Velny, Agus Subagio, Moh. Djaeni, Nandang Mufti
Rice husk carbon by-products from industrial combustion are a promising source to produce a vast amount of activated carbon adsorbent. This research prepared rice husk-activated carbon adsorbent by varying the concentration of potassium hydroxide solution (5, 10, 15, 20% w/v) and activation time (2, 4, 6, 8 hours). Fourier-transform infrared (FTIR) spectral characterization indicated a significant effect before and after activation, especially the presence of hydroxyl groups. Based on the iodine adsorption, the specific surface area of the produced-activated carbon was approximately 615 m2 /g. Experimental results showed that increasing potassium hydroxide concentration and activation time increases the water vapor adsorption capacity of the activated carbon. Compared with the rice husk carbon, the KOH-activated carbon enhanced the water vapor adsorption capacity to 931%. In the adsorption observation, changing the temperature from 15 to 27°C caused a higher water vapor uptake onto the activated carbon. Two adsorption kinetics (pseudo-first-and pseudo-second-order models) were used to evaluate the adsorption mechanism. This research found that rice husk-activated carbon performed a higher water vapor adsorption capacity than other adsorbents (silica gel, zeolite, and commercially activated carbon). © 2024, Iran University of Science and Technology. All rights reserved.
Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Indonesia; Department of Physics, Faculty of Science and Mathematics, Universitas Diponegoro, Jl. Prof. Soedarto Tembalang, Central Java, Semarang, 50275, Indonesia; Department of Physics, Faculty of Mathematics and Science, Universitas Negeri Malang, Jl. Semarang No.5, Sumbersari, Lowokwaru, East Java, Malang, 65145, Indonesia
