Strong Foam-like Composites from Highly Mesoporous Wood and Metal-Organic Frameworks for Efficient CO₂ Capture

Abstract

Mechanical stability and multicycle durability are essential for emerging solid sorbents to maintain an efficient CO 2 adsorption capacity and reduce cost. In this work, a strong foam-like composite is developed as a CO 2 sorbent by the in situ growth of thermally stable and microporous metal-organic frameworks (MOFs) in a mesoporous cellulose template derived from balsa wood, which is delignified by using sodium chlorite and further functionalized by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation. The surface carboxyl groups in the TEMPO-oxidized wood template (TO-wood) facilitate the coordination of the cellulose network with multivalent metal ions and thus enable the nucleation and in situ growth of MOFs including copper benzene-1,3,5-tricarboxylate [Cu 3 (BTC) 2 ], zinc 2-methylimidazolate, and aluminum benzene-1,3,5-tricarboxylate. The TO-wood/Cu 3 (BTC) 2 composite shows a high specific surface area of 471 m 2 g –1 and a high CO 2 adsorption capacity of 1.46 mmol g –1 at 25 °C and atmospheric pressure. It also demonstrates high durability during the temperature swing cyclic CO 2 adsorption/desorption test. In addition, the TO-wood/Cu 3 (BTC) 2 composite is lightweight but exceptionally strong with a specific elastic modulus of 3034 kN m kg –1 and a specific yield strength of 68 kN m kg –1 under the compression test. The strong and durable TO-wood/MOF composites can potentially be used as a solid sorbent for CO 2 capture, and their application can possibly be extended to environmental remediation, gas separation and purification, insulation, and catalysis.

Cellulose-Based Hybrid Composites Enabled by Metal Organic Frameworks for CO2 Capture: The Effect of Cellulosic Substrate

“…Ma et al used nanobacterial cellulose (NBC) as a template for amino-functionalized ZIF-8 (NH2-ZIF-8) and reported a high CO2 adsorption capacity of 1.63 mmol g −1 at 25 °C and 1 bar [30]. Wang et al studied a TEMPO-oxidized wood (TOwood) template for three types of MOFs [31]. They reported that the TO-wood/Cu3(BTC)2 presents a mechanically robust composite with a high specific surface area of 471 m 2 g −1 and a high CO2 adsorption capacity of 1.46 mmol g −1 at 25 °C and atmospheric pressure [31].…”

“…Wang et al studied a TEMPO-oxidized wood (TOwood) template for three types of MOFs [31]. They reported that the TO-wood/Cu3(BTC)2 presents a mechanically robust composite with a high specific surface area of 471 m 2 g −1 and a high CO2 adsorption capacity of 1.46 mmol g −1 at 25 °C and atmospheric pressure [31]. The morphological characteristics of the substrate could significantly affect the adsorption behavior of this class of composites.…”

In Situ Dry Chemical Synthesis of Nitrogen-Doped Activated Carbon from Bamboo Charcoal for Carbon Dioxide Adsorption

“…Vast work among the academic community has been taken to alleviate the negative effect of the rapid growth of atmospheric CO 2 concentration at a global level, such as developing renewable and clean energies [3][4][5] and functional porous materials [6,7], and decades of research and projects on carbon capture, utilization and sequestration (CCUS) [8][9][10] have been conducted to reduce the influence of carbon emission. And various solid absorbents, such like activated carbon (AC) [11][12][13][14], molecular sieve [15,16], metal oxides [17] and MOF [18], Among these products, ACs have been widely applied in carbon dioxide capture due to their special pore structure, specific surface area and chemical stability, and simple processing; tremendous research efforts have focused on the adsorption capacity, selectivity and renew-ability of activated carbon products [19][20][21][22][23][24].…”

Wood-Based Self-Supporting Nanoporous Three-Dimensional Electrode for High-Efficiency Battery Deionization

“…The N 2 adsorption isotherm (Figure 2c) reveals a type IV isotherm and H 4 hysteresis loop. 22 A specific surface area of 2.16 m 2 g −1 , together with a wide pore distribution range from mesopores to macropores as defined by the International Union of Pure and Applied Chemistry (IUPAC), can be derived from the SEM observation and N 2 adsorption data. 23 The hierarchal pores and larger surface area in 450 °C + NaClO 2 wood can provide channels for ion transfer and electrolyte infiltration; thus, a large ion storage capacity could be anticipated based on the inherent structural advantages in the 450 °C + NaClO 2 wood electrode.…”

“…Scanning electron microscope (SEM) images in Figure b and Figure S4 show that the 3D-wood electrode presents a hierarchical porous structure. The N 2 adsorption isotherm (Figure c) reveals a type IV isotherm and H 4 hysteresis loop . A specific surface area of 2.16 m 2 g –1 , together with a wide pore distribution range from mesopores to macropores as defined by the International Union of Pure and Applied Chemistry (IUPAC), can be derived from the SEM observation and N 2 adsorption data .…”