Pore structure and surface activities synergistically enhanced the adsorption performance of self-doped heteroatoms biochar for PPCPs (Pharmaceuticals and Personal Care Products). This biochar was prepared by two-step pyrolysis (TSP) using UPs (Ulmus pumila L. samara) with cavity structure, nitrogen and sulfur atoms, and higher cellulose and hemicellulose. UPBC-2 was prepared using the optimal dose of activator with a specific surface area of 2401 m²g⁻¹ and a pore volume of 1.984 cm³g⁻¹. Micropores in the hierarchical porous played a decisive role in the adsorption capacity of UPBC-2. Nitrogen (1.67 at. %) and sulfur (0.35 at. %) atoms were rapid adsorption sites for PPCPs, which were rapidly diffused into the interior of UPBC-2 through the hierarchical pores. The synergistic effect of pore structure and surface activity resulted in short equilibrium time (5, 7, and 5 min) and high saturation capacity (655.6, 754.0, and 601.7 mg g^-1) of CBZ, CQ, and DCF by UPBC-2. The adsorption capacity of UPBC-2 on PPCPs was almost independent of pH, ionic strength, coexisting ions, and adsorption–desorption cycles, but was influenced by molecular size and hydrophilicity of PPCPs. The dominant interaction in the adsorption process was the rapid π-electron sharing between PPCPs and graphitic N / thiophenic S.

中文翻译：

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生物炭多级孔和自掺杂原子在快速高效吸附 PPCPs 残基中的协同作用


孔结构和表面活性协同增强了自掺杂原子生物炭对 PPCP（药品和个人护理产品）的吸附性能。该生物炭是使用具有腔结构、氮和硫原子以及高级纤维素和半纤维素的 UPs （Ulmus pumila L. samara） 通过两步热解 （TSP） 制备的。使用最佳剂量的活化剂制备 UPBC-2，比表面积为 2401 m^{2 g-1}，孔体积为 1.984 cm^{3 g-1}。多级孔隙中的微孔对 UPBC-2 的吸附能力起决定性作用。氮 （1.67 at. %） 和硫 （0.35 at. %） 原子是 PPCP 的快速吸附位点，PPCP 通过多级孔迅速扩散到 UPBC-2 内部。孔结构和表面活性的协同作用导致 UPBC-2 的 CBZ、CQ 和 DCF 平衡时间短（5、7 和 5 min）和高饱和容量（655.6、754.0 和 601.7 mg/g）。UPBC-2 对 PPCP 的吸附能力几乎与 pH 值、离子强度、共存离子和吸附-解吸循环无关，但受 PPCP 的分子大小和亲水性的影响。吸附过程中的主要相互作用是 PPCP 和石墨 N / 噻吩 S 之间的快速π电子共享。