Production of carbonaceous adsorbents from agricultural by-products and novolac resin under a continuous countercurrent flow type pyrolysis operation

► Olive stone biomass is precursor for adsorbents through continuous pyrolysis operation. ► Surface pyrolyzed specimens present maximum dye adsorption, highest weight losses. ► Pseudo-second order mechanism describes better methylene blue adsorption. ► Specific surface area values increase as follows: AC > N20B-cC > N40B-cC. ► Gross calorific values increase as follows: N100-c > N40B-cC > N20B-cC > B.