Solvent-Free Synthesis of N-Doped Porous Carbons from Chitosan for an Efficient CO<sub>2</sub> Capture
Qianqian Yang, Daoguang Teng, Jie Qu, Peng Li, Yijun Cao
Abstract
A facile solvent-free strategy for constructing N-doped porous carbons (NPCs) by direct carbonization of chitosan with fully mixed N-sources is developed in this study. Carbonization temperatures and different N sources were thoroughly investigated to optimize the preparation conditions for better synthesis. Porosities and heteroatom doping (N doping) were comprehensively studied to figure out the effects on the CO2-uptake capacities of the NPCs. The obtained NPCs were fully characterized using different analytical techniques to explore their physicochemical properties and application potential. NPCs are found to perform greatly in porosities; In particular, NPCs prepared by grinding chitosan with 2,4,6-triaminopyrimidine followed by carbonization at 700 °C exhibit CO2 adsorption capacities of 4.74 mmol g–1 (0 °C and 1 bar). The abovementioned great CO2-uptake capacities as well as economical precursors and low energy demand indicate these chitosan-based NPCs to be promising industrial CO2-capture adsorbents