Research of Adsorption Characteristics of Sulf Antibiotics on Corn Stover Biochar

In this study, biochar was prepared from corn straw (BC) and modified by nitric acid (HBC). The adsorption properties of biochar on sulfachloropyridazine(SCP), sulfamethoxazole(SMZ) and sulfamethazine(SMA) before and after modification were investigated. The results show that the adsorption kinetics of both kinds of biochar on the three antibiotics were all well fitted by the quasi-second-order kinetic equations. The adsorption rate of acid-modified biochar was higher than that of unmodified biochar. The whole adsorption processes of the two kinds of biochar were spontaneous, endothermic and disordered which can be better described by Langmuir model. The adsorption capacity of HBC was greater than that of BC. In the mixed system, the adsorption capacity of SCP and SMZ on BC and HBC was better than that of SMA. Overall, the adsorption effect of SCP, SMZ and SMA on acid-modified biochar was better than that on unmodified biochar.