Tuning Both Surface Chemistry and Porous Properties of Polymer-Derived Porous Carbons for High-Performance Gas Adsorption

作者：Shan Liu, Zhuyin Sui, Tianxiong Wang, Hangyu Zhou, Yuwen Liu, Bao‐Hang Han · 发表于：Langmuir · 年份：2019 · DOI：10.1021/acs.langmuir.9b00147 · 被引用次数：12 · 研究领域：Membrane Separation and Gas Transport、Covalent Organic Framework Applications、Carbon Dioxide Capture Technologies

In this study, we have prepared novel pyrrole–formaldehyde polymers through polymerizing pyrrole and formaldehyde in the mixture solvent of water and ethanol by using hydrochloric acid as a catalyst. The as-synthesized polymers possess a nitrogen content of 6.7 atom % and are composed of spherical particles with the diameter of approximately 1–3 μm. A series of nitrogen-doped porous carbons with high specific surface areas (680–2340 m 2 g –1 ) were successfully obtained through the activation treatment of the polymer spheres. The porous properties and surface chemistry of the as-prepared porous carbons are tuned by choosing different activating agents and changing the activation temperature. The morphology, porous properties, and chemical composition of the obtained nitrogen-doped porous carbons are revealed by various characterization methods, such as scanning electron microscopy, nitrogen sorption measurement, and X-ray photoelectron spectroscopy. The as-prepared nitrogen-doped porous carbons as gas adsorbents display high carbon dioxide uptake capacities of 3.80–5.81 mmol g –1 at 273 K and 1.0 bar. They also show excellent carbon dioxide adsorption capacities (2.40–3.37 mmol g –1 at 1.0 bar) and good gas selectivities (CO 2 /N 2 selectivities of 16.9–70.2) at 298 K.