标题：Removal of sulfadiazine from aqueous solution by in-situ activated biochar derived from cotton shell
作者：Meng Q.; Zhang Y.; Meng D.; Liu X.; Zhang Z.; Gao P.; Lin A.; Hou L.
作者机构：[Meng, Q] College of Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China, College of Resources and Environmental 更多
通讯作者地址：[Hou, L] College of Chemical Engineering, China University of Petroleum (East China)China;
关键词：Antibiotic; Biochar; Exothermic process; Phosphoric acid activation; Regeneration
摘要：Phosphoric acid is used to in-situ activate biochar pyrolyzed by cotton shells to enhance the adsorption ability of sulfadiazine (SDZ). To confirm the optimum condition, different impregnation ratios and impregnation times were investigated. It was found that the biochar (BC) pyrolyzed under the condition of an impregnation ratio of 2.5 and an impregnation time of 6 h showed the highest performance for the removal of SDZ. The maximum adsorption ability was 86.89 mg/g at a temperature of 298 K. The pseudo-second-order model was used to disclose the adsorption process of SDZ by BCs. The experimental data were described by the Langmuir and Temkin isotherms at different temperatures. It was found that the sorption of SDZ was an exothermic process according to the thermomechanical analysis. The activated BC could be recycled for at least five times with a high removal rate of SDZ. Thus, activated BCs are regarded as promising adsorbents for SDZ removal. © 2020 Elsevier Inc.