Abstract
CO2 adsorption in porous carbon materials has attracted great interests for alleviating emission of post-combustion CO2. In this work, a novel nitrogen-doped porous carbon material was fabricated by carbonizing the precursor of melamine-resorcinol-formaldehyde resin/graphene oxide (MR/GO) composites with KOH as the activation agent. Detailed characterization results revealed that the fabricated MR(0.25)/GO-500 porous carbon (0.25 represented the amount of GO added in wt.% and 500 denoted activation temperature in °C) had well-defined pore size distribution, high specific surface area (1264 m2·g−1) and high nitrogen content (6.92 wt.%), which was mainly composed of the pyridinic-N and pyrrolic-N species. Batch adsorption experiments demonstrated that the fabricated MR(0.25)/GO-500 porous carbon delivered excellent CO2 adsorption ability of 5.21 mmol·g−1 at 298.15 K and 500 kPa, and such porous carbon also exhibited fast adsorption kinetics, high selectivity of CO2/N2 and good recyclability. With the inherent microstructure features of high surface area and abundant N adsorption sites species, the MR/GO-derived porous carbon materials offer a potentially promising adsorbent for practical CO2 capture.
Highlights
The aim of the study is to prepare a novel nitrogen-doped porous carbon material (NPCM) derived from the composite material composed of melamine-resorcinol-formaldehyde resin and graphene oxide(MR/GO) for CO2 adsorption in a temperature range of 25–50 ◦ C and pressure range of
GO and GO(0.25)/melamine-resorcinol resin (MR)-derived porous carbon materials at different activation temperaThe CO2 adsorption isotherms of all samples were measured at 25–50 °C and 0–500 tures
KPa using a self-made static adsorption apparatus, as shown in Supplementary Materials, isotherms according to IUPAC classification, which indicates the existence of micropores steep rise in N2 adsorption at high relative pressure (P/P0 > 0.4) are observed
Summary
Carbon dioxide (CO2 ) emissions are generally recognized as the leading cause of global warming. Emissions Gap Report 2020 reported that global greenhouse gas (GHS) emissions continued to increase and reached a record high of 52.4 ± 5.2 Gt CO2 e without land-use change (LUC). Emissions and 59.1 ± 5.9 Gt CO2 e with LUC in 2019. GHS emissions with 65% and reached a record 38.0 ± 1.9 GtCO2 on the basis of preliminary data [1]. Carbon capture and storage (CCS) is broadly regarded as one of the most effective techniques to reduce CO2 emission [2,3,4].
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