Understanding of the correlation between physico-chemical property of adsorbent and the adsorption performance of contaminant is very significant for developing high-efficient materials to remove antibiotic contamination from water. In this work, a novel kind of carbon adsorbent (EC) derived from CO₂ and activated ECs with modified structure via a facile chemical method using H₂ and KOH were prepared. The synthetic carbon materials (EC, EC-H₂, and EC-KOH) were then applied to remove tetracycline (TC). The kinetics of adsorption for these three carbon materials all well fitted the pseudo-second-order kinetic model. The experimental data of adsorption isotherm had good compatibility with Langmuir and Freundlich models (R² > 0.90), but the Temkin model was the most applicable for all adsorbents (R² > 0.98). A super-high adsorption capacity of EC-KOH obtained from Langmuir fitting was 933.56 mg g^-1, which was much higher than that of EC-H₂ (538.91 mg g^-1) and EC (423.30 mg g^-1), possibly due to a larger specific surface area (S_BET), pore volume, and specific surface chemical structure. Moreover, it was found that surface functional groups and large aperture of adsorbents had a positive effect on adsorption rate. More adsorption sites and surface functional groups of adsorbents were beneficial to enhance the adsorption affinity. These results are of great benefit to the directional control of carbon structure to increase the adsorption performance in rate, capacity, and affinity of antibiotics.

了解吸附剂的理化性质与污染物的吸附性能之间的相关性对于开发高效材料以去除水中的抗生素污染物非常重要。在这项工作中，通过使用H ₂和KOH的简便化学方法，制备了一种新型的碳吸附剂（EC），其源自CO ₂和具有改性结构的活化EC 。然后使用合成碳材料（EC，EC-H ₂和EC-KOH）去除四环素（TC）。这三种碳材料的吸附动力学都很好地拟合了伪二级动力学模型。吸附等温线的实验数据与Langmuir和Freundlich模型（R ²> 0.90），但Temkin模型最适用于所有吸附剂（R ² > 0.98）。由Langmuir拟合得到的EC-KOH的超高吸附能力为933.56 mg g ^-1，远远高于EC-H ₂（538.91 mg g ^-1）和EC（423.30 mg g ^-1）的吸附能力。由于较大的比表面积（S _BET），孔体积和特定的表面化学结构。此外，发现表面官能团和吸附剂的大孔径对吸附速率具有积极影响。吸附剂的更多吸附位点和表面官能团有利于增强吸附亲和力。这些结果对于碳结构的方向控制以增加吸附速率，容量和对抗生素的吸附性能非常有利。