One-Pot Synthesis of Melamine Formaldehyde Resin-Derived N-Doped Porous Carbon for CO2 Capture Application

Abstract

The design and synthesis of porous carbons for CO2 adsorption have attracted tremendous interest owing to the ever-soaring concerns regarding climate change and global warming. Herein, for the first time, nitrogen-rich porous carbon was prepared with chemical activation (KOH) of commercial melamine formaldehyde resin (MF) in a single step. It has been shown that the porosity parameters of the as-prepared carbons were successfully tuned by controlling the activating temperature and adjusting the amount of KOH. Thus, as-prepared N-rich porous carbon shows a large surface area of 1658 m2/g and a high N content of 16.07 wt%. Benefiting from the unique physical and textural features, the optimal sample depicted a CO2 uptake of up to 4.95 and 3.30 mmol/g at 0 and 25 °C under 1 bar of pressure. More importantly, as-prepared adsorbents show great CO2 selectivity over N2 and outstanding recyclability, which was prominently important for CO2 capture from the flue gases in practical application. An in-depth analysis illustrated that the synergetic effect of textural properties and surface nitrogen decoration mainly determined the CO2 capture performance. However, the textural properties of carbons play a more important role than surface functionalities in deciding CO2 uptake. In view of cost-effective synthesis, outstanding textural activity, and the high adsorption capacity together with good selectivity, this advanced approach becomes valid and convenient in fabricating a unique highly efficient N-rich carbon adsorbent for CO2 uptake and separation from flue gases.

In Situ N, O Co-Doped Nanoporous Carbon Derived from Mixed Egg and Rice Waste as Green Supercapacitor

“…However, the N 2 adsorption–desorption curves for WPAC-2, WPAC-0, YPAC-2, and YPAC-0 exhibited adsorption hysteresis loops, which is a characteristic feature of type IV isotherms; this result indicates the coexistence of micropores and mesopores [ 32 ]. Additionally, under high pressure conditions (0.95 < P/P 0 < 1.0), the N 2 adsorption–desorption isotherm shows a slight increase, indicating the presence of a small number of macropores in the material [ 33 ]. Secondly, the pore size distribution of the samples was calculated in accordance with the N 2 adsorption–desorption isotherm using NLDFT ( Figure 2 c,d).…”

Carbonized Aminal-Linked Porous Organic Polymers Containing Pyrene and Triazine Units for Gas Uptake and Energy Storage

“…As expected, Py-PDT POP-600, with the highest BET surface area, offered the most increased CO2 uptake of 2.7 mmol g −1 . As presented in Figure 6b, the CO2 capacity of Py-PDT POP-600 (2.7 mmol g −1 ) was higher than that of BZPh-A (1.44 mmol g −1 ) [64], UFK-550-0.1 (1.6 mmol g −1 ) [65], N-doped porous CNF (1.78 mmol g −1 ) [66], MFC-650-0.1(2.06 mmol g −1 ) [67], MFC-750-0.1 (2.31 mmol g −1 ) [67], and UFK-550-0.1 (2.47 mmol g −1 ) [65]. 3.3.…”

Sulfur-Enriched Nanoporous Carbon: A Novel Approach to CO2 Adsorption

“…In the past decade, substantial research efforts have been directed at exploring solid adsorbents, such as carbons, − metal–organic frameworks (MOFs), , zeolites, covalent-organic frameworks (COFs), , and porous polymers, − for the objective of CO 2 removal. Within this broad spectrum of adsorbents, porous carbons have received great attention due to their potential as very promising sorbents for the extraction of CO 2 .…”