芳胺废渣衍生多孔碳高效吸附去除对硝基苯酚

Efficient adsorption removal of p-Nitrophenol by aromatic amine waste derived porous carbon

摘要:

以工业生产过程中产生的芳胺废渣为碳前驱体，以乙酸镁作为氧化镁模板剂前驱体，采用一步法制备了N、O原位共掺杂的分级多孔碳(RPCs)。通过SEM和N2物理吸脱附对材料的形貌和孔结构进行表征,通过XPS对掺杂的N、O物种进行分析。按照质量比=1.00制备的RPC-1.00具有1427 m2/g的比表面积以及1.4713 cm3/g的孔容积。在出色的比表面积，丰富的孔结构和N、O掺杂物种的共同作用下，RPC-1.00针对对硝基苯酚的静态吸附量能够达到562.66 mg/g，固定床动态吸附量能够达到345.01 mg/g。理论计算发现，N、O原子的掺入能够增加吸附体系的色散力和静电吸引，能够有效提高吸附能。吡啶-N4和羧基结构也能产生很强的氢键作用力，提升了吸附能力。

Abstract:

N, O in-situ co-doped hierarchical porous carbons (RPCs) were prepared by one-step method using aromatic amine waste residue produced in industrial production as carbon precursor and magnesium acetate as magnesium oxide template precursor. The morphology and pore structure of the materials were characterized by SEM and N2 physical adsorption and desorption, and the doped N and O species were analyzed by XPS. RPC-1.00 prepared at a mass ratio of 1.00 has a specific surface area of 1427 m2/g and a pore volume of 1.4713 cm3/g. Under the combined action of excellent specific surface area, abundant pore structure and N, O doped species, the static adsorption capacity of RPC-1.00 for p-nitrophenol can reach 562.66 mg/g, and the dynamic adsorption capacity of fixed bed can reach 345.01 mg/g. Theoretical calculations show that the incorporation of N and O atoms can increase the dispersion force and electrostatic attraction of the adsorption system, which can effectively improve the adsorption energy. Pyridine-N4 and carboxyl structure can also produce strong hydrogen bonding force, enhance the adsorption capacity.