Rapid, simple and sustainable synthesis of ultra-microporous carbons with high performance for CO2 uptake, via microwave heating

Abstract

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Synergistic Effect of Nitrogen Doping and Ultra-Microporosity on the Performance of Biomass and Microalgae-Derived Activated Carbons for CO2 Capture

“…For example, incorporation of nitrogen groups into the melamine-based mesoporous carbon structure demonstrated the development of efficient N-doped activated carbons for CO 2 capture and using amino acid ( l -lysine) as a nitrogen precursor can yield N-doped carbon monolith with a high CO 2 capture capacity of 3.1 mmol/g . Apart from the introduction of nitrogen, recent studies have shown strong adsorption potential in porous carbons with narrow micropores (<1 nm), , suggesting that the presence of ultra-micropores is an important factor for improved CO 2 adsorption. However, chemically fusing the porous carbons with amine or nitrogen-containing compounds often results in the drastic reduction of their pore volume and specific surface area due to the pore blocking .…”

Advances in Microwave Synthesis of Nanoporous Materials

“…Microwave‐assisted synthesis was shown to be an excellent method for the preparation of ultramicroporous (ultramicroporosity up to 72%) activated carbons with high CO 2 adsorption capacities and selectivities. [ 110 ] Such ACs with narrow pores, whose activation involved KOH or K 2 CO 3 , exhibited a high CO 2 uptake under 1 bar: up to 5.3 and 4.5 mmol g −1 at 0 °C, and 3.7 and 3.3 at 25 °C, respectively ( Figure ). Moreover, these carbons showed high CO 2 /N 2 selectivity up to 36.…”

“…Porous carbons obtained via microwave‐assisted methods with their SSA values and potential applications are summarized in Table 4 . [ 65–122 ]…”

Microwave‐Positioning Assembly: Structure and Surface Optimizations for Catalysts

“…Under the microwave superheat of graphene, we summarize the forms of 1D nanomaterials, nanoparticles combined with 2D materials, and their synthesis mechanism, which presents a new paradigm for future composite processes and structural optimization of nanocomposites that can be gradually extended for applications in catalysis, [ 33,34 ] sensing, [ 35 ] or energy storage. [ 36,37 ]…”

“…As a common material with excellent microwave absorbing properties, the carbon material is widely used in microwave synthesis systems. The absorption of the microwave by carbon materials is conducive to the rapid nucleation and growth of crystals on its surface, [ 16,36,64 ] and the energy enriched on its surface sites can redox some precursors in situ to form composites combined with carbon materials. [ 65–67 ] At the same time, due to the unique physical and chemical properties of carbon materials, they can also build charge transfer channels, accelerate carrier transfer, and increase reaction active sites in the catalytic reaction system.…”