Rice husk-based biochar for carbon dioxide adsorption in biogas

Abstract

Rice husk-based biochar has been prepared by pyrolysis process for carbon dioxide adsorption in biogas. Biochar is considered as porous material for carbon dioxide adsorption. In this study, the adsorption of carbon dioxide, the largest impurity in biogas, was evaluated. The adsorptions were conducted in five treatments (mass variation): 80 grams of biochar (RB1), 60 grams of biochar and 20 grams of zeolite (RB2), 40 grams of biochar and 40 grams of zeolite (RB3), 20 grams of biochar and 60 grams of zeolite (RB4), 80 grams of zeolite (RB5). The best performance of carbon dioxide adsorption showed by RB1 with the decrease in carbon dioxide up to 31.59%. Characterization of adsorbents were also investigated by surface area analyzer to know relation between surface area and adsorption capability. It was found that the larger surface areas are favorable to adsorb carbon dioxide.

The Substitution of Natural Zeolite with Agriculture Waste as Carbon Dioxide Adsorbent in Biogas Purification

“…Sugiarto et al [5] reported that zeolite attracts to capture carbon dioxide because it has strong electro-positivity and attracts acidic character like carbon dioxide molecules [13]. Rice husk-based biochar is reported to have larger pore surface area than that of natural zeolite [10] so the ability to adsorb carbon dioxide increased but not significantly when 25% volume of natural zeolite was replaced by rice husk-based biochar. The substitution of natural zeolite with biochar with the proportion of 25% of total volume would maximize the pore area that has the function to capture carbon dioxide molecules.…”

“…This study investigates the use of rice husk-based biochar for biogas purification that is considered rare. The previous study had used rice husk-based biochar combined with natural zeolite for biogas purification in the mass ratio [10]. However, based on the study evaluation, the mass ratio between natural zeolite and biochar cannot be compared to each other because of the density.…”