en Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:200%"><span style="font-family:Calibri,sans-serif"><span new="" roman="" style="font-family:" times="">Rice husk carbon by-product from the industrial combustion is 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 spectral characterization (FTIR) 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 ℃ 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).</span></span></span></span> activated carbon,adsorption kinetics,desiccant,rice husk,water vapor adsorption 82 91 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5263-1&slc_lang=en&sid=1 Dewi Qurrota A'yuni imayunidewi@gmail.com 1800319475328460019269 1800319475328460019269 No Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro Jl. Prof. Soedarto Tembalang, Semarang, Central Java, Indonesia 50275 Hadiantono Hadiantono hadi.antono01@gmail.com 1800319475328460019270 1800319475328460019270 No Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro Jl. Prof. Soedarto Tembalang, Semarang, Central Java, Indonesia 50275 Velny Velny velnyvelny05@gmail.com 1800319475328460019271 1800319475328460019271 No Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro Jl. Prof. Soedarto Tembalang, Semarang, Central Java, Indonesia 50275 Agus Subagio agussubagio@lecturer.undip.ac.id 1800319475328460019272 1800319475328460019272 No Department of Physics, Faculty of Science and Mathematics, Universitas Diponegoro Jl. Prof. Soedarto Tembalang, Semarang, Central Java, Indonesia 50275 Moh. Djaeni moh.djaeni@live.undip.ac.id 1800319475328460019273 1800319475328460019273 Yes Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro Jl. Prof. Soedarto Tembalang, Semarang, Central Java, Indonesia 50275 Nandang Mufti nandang.mufti.fmipa@um.ac.id 1800319475328460019274 1800319475328460019274 No Department of Physics, Faculty of Mathematics and Science, Universitas Negeri Malang Jl. Semarang No.5, Sumbersari, Lowokwaru, Malang, East Java 65145