Efficient preparation of P-doped carbon with ultra-high mesoporous ratio from furfural residue for dye removal

作者：Zhou, Xiang; Liu, Xiaohao^*; Qi, Fenglei; Shi, Haixia; Zhang, Ying; Ma, Peiyong^*

来源：SEPARATION AND PURIFICATION TECHNOLOGY, 2022, 292: 120954.

DOI：10.1016/j.seppur.2022.120954

• P-doped mesoporous carbon
• Furfural residue
• Structural evolution
• Dye adsorption
• Adsorption mechanism

P-doped mesoporous carbon material is receiving increasing attention in various fields due to its special physicochemical properties, but the research in the field of pollutant removal is rarely reported. Herein, P-doped furfural residue-based carbon materials (PFRC) with ultra-high mesoporous ratio (93.9%), narrow pore size distribution and large surface area (1769.4 m(2) g(-1)) was prepared by a simple method of fast pyrolysis of phosphoric acid treated furfural residue (FR). A series of characterizations were carried out to explore the physicochemical properties and P-doping mechanism of the materials systematically. With the increase of the activation temperature, the evolution of the P-doped structure is as follows: adsorbed phosphate -> P-O-C-aromatic -> O3P-C-aromatic -> O2P-C2(aromatic)-> OP-C3(aromatic). The PFRC500 prepared at 500 degrees C has the most abundant P-O-C-aromatic and P-C-aromatic structures, which lead to a higher specific surface area, more developed pore structure and more graphite edge defects than other PFRCs. Methylene blue (MB) adsorption studies showed that PFRC500 had a good adsorption performance with 486 mg g(-1) equilibrium adsorption capacity and 97.2% of removal rate (T=298 K, C-0=100 mg L-1). The adsorption kinetics and thermodynamics were studied. The role of P structure in MB adsorption was explored for the first time. the adsorption mechanism was explored. The P-O-C-aromatic, O3P-C-aromatic and O2P-C2(aromatic) structures are the main chemical adsorption sites, but C3(aromatic)-PO is not. This work can provide guidance for the design of P-doped mesoporous carbon materials with better adsorption performance in the future.