同步活化氮掺杂海藻酸钠基多孔碳制备及对双酚A的高效吸附

为了进一步提升多孔碳材料的吸附性能,以海藻酸钠(SA)为碳前驱体、K2CO3为活化剂、三聚氰胺为氮掺杂剂,通过一步法实现同步活化氮掺杂海藻酸钠基多孔碳材料(SAC/N)的制备,研究了掺氮比对多孔碳吸附性能的影响.采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)等方法对样品进行了表征.结...

Efficient adsorption of BPA by alginate-based porous carbon with the preparation of synchronous activation and nitrogen doping

This study aims to further improve the adsorption performance of porous carbon materials, with sodium alginate (SA) as carbon precursor, K₂CO₃ as activator and melamine as nitrogen dopant, so the sodium alginate-based porous carbon materials (SAC/N) were prepared by one-step synchronous activation and nitrogen doping. This study measured the influence of nitrogen mixing ratio on the adsorption performance of porous carbon. The samples were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). The results showed that when the mass ratio of SA, K₂CO₃ and melamine was 1:1:0.2, the optimal product obtained was SAC/N-0.2. Its specific surface area was 2017.98m²/g, and the total pore volume reached 1.23cm³/g, which was 0.88 times and 1.1 times higher than that of non-nitrogenous porous carbon (SAC/N-0), respectively. The adsorption process was in accordance with the pseudo-second-order kinetics and Langmuir model. At 308K, SAC/N-0.2 could reach the adsorption equilibrium of bisphenol A (BPA) within 30min, and the saturated adsorption capacity was as high as 1180.02mg/g, which was double compared with SAC/N-0. The carbon material doped with nitrogen obviously exhibited layered porous structure, which fully indicated that melamine played a synergistic role in the pore formation during SA activation. In addition, SAC/N-0.2 had strong resistance to acid-base, ion and organic interference, and had good regeneration performance.