Characterization of Natural Zeolite and Chicken Manure Derived Biochar for Carbon Dioxide Adsorption in BiogasMargaretha Arnita Wuri, Ambar Pertiwiningrum, Rachmawan Budiarto and Cahyono Agus Dwi KorantoE3S Web Conf., 43 (2018) 01008DOI: https://doi.org/10.1051/e3sconf/20184301008