Table 3 show the enhanced performance of Ca-RB in adsorbing MB was attributed to Ca(OH)2 modification, which involved factors such as increased alkalinity and changes in electrical conductivity. Despite the modified Ca-RB having a smaller specific surface area and pore volume, it displayed a larger average pore size compared to most other modified biochars. Interestingly(อินเทอเรสลี่), the surface and pore structure of Ca-RB underwent minimal changes after the modification.