Haijun Lv

Thin-walled, mesoporous and nitrogen-doped hollow carbon spheres using ionic liquids as precursors

Nitrogen-doped hollow carbon spheres with uniform and tunable morphology can be facilely synthesized by the monodisperse silica-template carbonization followed by hydrofluoric acid etching. The hollow carbon spheres containing 3.2 wt% of nitrogen have a thin wall of 5–12 nm and mesoporous shell structure.

A co-confined carbonization approach to aligned nitrogen-doped mesoporous carbon nanofibers and its application as an adsorbent

Nitrogen-doped carbon nanofibers (MCNFs) with an aligned mesoporous structure were synthesized by a co-confined carbonization method using anodic aluminum oxide (AAO) membrane and tetraethylorthosilicate (TEOS) as co-confined templates and ionic liquids as the precursor. The as-synthesized MCNFs with the diameter of 80-120nm possessed a bulk nitrogen content of 5.3wt% and bimodal mesoporous structure. The nitrogen atoms were mostly bound to the graphitic network in two forms, i.e. pyridinic and pyrrolic nitrogen, providing adsorption sites for acidic gases like SO2 and CO2. Cyclic experiments revealed a considerable stability of MCNFs over 20 runs of SO2 adsorption and 15 runs for CO2 adsorption. The MCNFs also have a preferable adsorption performance for Cd(2+).

Mesoporous carbonaceous materials prepared from used cigarette filters for efficient phenol adsorption and CO2 capture

Mesoporous carbonaceous materials (MCMs) with a 2-D hexagonal (p6mm) mesostructure are synthesized through evaporation induced self-assembly on the surface of cigarette filters by using phenol/formaldehyde resol as a carbon precursor, triblock copolymer F127 as the template and cigarette filters as the matrix scaffold. The obtained MCMs incorporate the advantages of cigarette filters and phenol/formaldehyde resol, and results in enhanced performance for phenol adsorption and CO2 capture. X-ray diffraction and transmission electron microscopy results indicate that the obtained carbon materials have an ordered p6mm mesostructure and good thermal stability. The MCMs possess a uniform pore size (5.1 nm), large surface area (526 m2 g−1) and pore volume (0.39 cm3 g−1), as well as exhibiting a considerable phenol adsorption (261.7 mg g−1) and CO2 capture (2.48 mmol g−1).

Synthesis of Nitrogen-Doped Mesoporous Carbon for the Catalytic Oxidation of Ethylbenzene

Nitrogen-doped ordered mesoporous carbon (NOMC) was fabricated via a simple hard-template method by functionalized ionic liquids as carbon and nitrogen source, SBA-15 as a hard-template. The obtained NOMC materials have a high nitrogen content of 5.55 %, a high surface area of 446.2 m2 g-1, and an excellent performance in catalysing oxidation of ethylbenzene. The conversion rate of ethylbenzene can be up to 84.5% and the yield of acetophenone can be up to 69.9%, the results indicated that the NOMC materials have a faster catalytic rate and a higher production of acetophenone than catalyst-free and CMK-3, due to their uniform pore size, high surface area and rich active sites in the carbon pore walls.