Abstract Biochar has acquired increasing attention in waste utilization and the treatment of environmental pollutants. In this study, the physicochemical properties of five types of biochars include straw biochar (SWB), coconut shell biochar (CSB), sawdust-coal biochar (SCB), bamboo biochar (BOB), rice husk biochar (RHB), and their adsorption of epoxiconazole (EPC) is discussed. The effects of initial concentration of EPC, solution temperature and pH level to these biochars were investigated. Besides, this work also analyzed the adsorption kinetics, adsorption isotherm, and thermodynamics of EPC removal in five biochar. Freundlich isotherm shows that the adsorption capacity decreased in the order SCB > BOB > CSB > SWB > RHB. The removal efficiency of EPC by SCB, BOB and CSB are much higher than SWB and RHB, and SCB has the best performance in EPC removal. The adsorption capacity of SCB is 19.0 g/kg, and its removal rate is nearly 97 %. The adsorption capacity of RHB is only 10.8 g/kg, with the removal rate of about 51 %. According to the characterization results of BET, SEM, XRD, and FT-IR, it is speculated that the adsorption capacity of five biochars to EPC is closely related to the total pore volume and specific surface area (SSA).

中文翻译：

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常用生物炭去除水中氟环唑的影响因素研究

摘要 生物炭在废物利用和环境污染物处理方面越来越受到重视。本研究对秸秆生物炭（SWB）、椰壳生物炭（CSB）、木屑煤生物炭（SCB）、竹生物炭（BOB）、稻壳生物炭（RHB）5种生物炭的理化性质及其吸附作用进行了研究。讨论了氟环唑 (EPC)。研究了 EPC 初始浓度、溶液温度和 pH 值对这些生物炭的影响。此外，这项工作还分析了五种生物炭中EPC去除的吸附动力学、吸附等温线和热力学。Freundlich 等温线表明吸附容量以 SCB > BOB > CSB > SWB > RHB 的顺序降低。SCB、BOB和CSB对EPC的去除效率远高于SWB和RHB，而SCB在EPC去除方面的表现最好。SCB的吸附量为19.0 g/kg，去除率接近97%。RHB的吸附量仅为10.8 g/kg，去除率约为51%。根据BET、SEM、XRD和FT-IR的表征结果，推测五种生物炭对EPC的吸附能力与总孔容和比表面积（SSA）密切相关。