Highly effective and green method to improve the adsorption performance of rice husk biochar

Rice husk biochar is a low-cost carbonaceous adsorbent; however, it has low adsorption capacity. To increase its potential application, biochar should be modified to enhance its porous structure and surface adsorptive sites for better adsorption performance. In this study, a hydrothermal process has been proposed to modify rice husk biochar and evaluate its effect on the structure and rhodamine B adsorption performance. Upon the hydrothermal treatment, surface area and porosity increased significantly from 54.1 m2/g and 0.04 cm3/g to 104.7 m2/g and 0.08 cm3/g, respectively and as result, its adsorption capacity improved by 98.6