In this study, graphite-like biochars were successively prepared by pyrolyzing modified newspaper and maize straw with ball-milling and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)- mediated oxidation at a pyrolysis temperature of 900 °C and their physico-chemical properties and adsorption performances towards imidacloprid (IMI) and sulfadiazine (SUL) in aqueous solution were all explored. The results showed that the successive modification by ball-milling and TEMPO-mediated oxidation completely open the fibers of the newspaper and porous stereoscopic structures of the maize straw. The obtained graphite-like biochars contained planar structures and abundant O-containing functional groups, and exhibited a great degree of graphitization and specific surface areas reaching up to 871.5 and 1065 m²/g, making them super adsorbents. Furthermore, hydrophobic partitioning provided a limited contribution to the sorption on biochars for IMI and SUL as revealed by dual-mode model fitting. The graphite-like biochars adsorbed IMI and SUL, mainly through pore-filling, H-bonding, cation/p/π-π EDA interactions, and electrostatic interactions and cation-π EDA interactions further enhanced the sorption of cationic IMI. Additionally, the adsorption efficiency of biochars pretreated with ball-milling and TEMPO-mediated oxidation for IMI and SUL was>85%, even after five consecutive recycling process. Thus, this study provides excellent graphite-like biochar adsorbents pretreated with a combined ball-milling and oxidation modification method, making them efficient for removing hydrophilic pesticides and antibiotics from polluted water.

在这项研究中，通过在900°C的热解温度下，通过球磨和2,2,6,6-四甲基哌啶-1-氧基（TEMPO）介导的氧化作用将改性的报纸和玉米秸秆热解，依次制备了石墨状生物炭。考察了它们在水溶液中对吡虫啉（IMI）和磺胺嘧啶（SUL）的理化性质和吸附性能。结果表明，通过球磨和TEMPO介导的氧化进行的连续修饰，完全打开了报纸的纤维和玉米秸秆的多孔立体结构。所获得的类石墨生物炭具有平面结构和丰富的含O官能团，并且石墨化程度高，比表面积分别达到871.5和1065 m ^2。/ g，使其成为超级吸附剂。此外，如通过双模式模型拟合所揭示的，疏水性分配对IMI和SUL在生物炭上的吸附提供了有限的贡献。石墨状生物炭主要通过孔填充，氢键，阳离子/ p /π-πEDA相互作用吸附IMI和SUL，静电相互作用和阳离子-πEDA相互作用进一步增强了阳离子IMI的吸附。此外，即使经过五个连续的回收过程，用球磨和TEMPO介导的氧化预处理的生物炭对IMI和SUL的吸附效率也> 85％。因此，本研究提供了一种出色的类石墨生物炭吸附剂，采用球磨和氧化改性相结合的方法进行了预处理，使其能够有效地去除污水中的亲水性农药和抗生素。