1. School of Water and Environment, Chang'an University, Xi'an 710054, China; 2. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Xi'an 710054, China; 3. Transportation Research Institute, Shandong Province, Jinan 250102, China
Abstract：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.
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