Reduced-graphene-oxide (rGO) aerogels provide highly stabilising, multifunctional, porous supports for hydrotalcite-derived nanoparticles, such as MgAl-mixed-metal-oxides (MgAl-MMO), in two commercially important sorption applications. Aerogel-supported MgAl-MMO nanoparticles show remarkable enhancements in adsorptive desulfurization performance compared to unsupported nanoparticle powders, including substantial increases in organosulfur uptake capacity (>100% increase), sorption kinetics (>30-fold), and nanoparticle regeneration stability (>3 times). Enhancements in organosulfur capacity are also observed for aerogelsupported NiAl-and CuAl-metal-nanoparticles. Importantly, the electrical conductivity of the rGO aerogel network adds completely new functionality by enabling accurate and stable nanoparticle temperature control via direct electrical heating of the graphitic support. Support-mediated resistive heating allows for thermal nanoparticle recycling at much faster heating rates (>700 °C•min −1) and substantially reduced energy consumption, compared to conventional, external heating. For the first time, the CO 2 adsorption performance of MgAl-MMO/rGO hybrid aerogels is assessed under elevated-temperature and high-CO 2-pressure conditions relevant for pre-combustion carbon capture and hydrogen generation technologies. The total CO 2 capacity of the aerogel-supported MgAl-MMO nanoparticles is more than double that of the unsupported nanoparticles and reaches 2.36 mmol•CO 2 g −1 ads (at p CO2 = 8 bar, T = 300 °C), outperforming other high-pressure CO 2 adsorbents.

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Graphite carbon nitride (g‐C3N4) and SiC have drawn increasing attention for application in visible light photocatalytic hydrogen evolution by water splitting due to their unique band structure and high physicochemical stability. Herein, a g‐C3N4‐SiC heterojunction with loaded noble metal is constructed. The g‐C3N4‐SiC‐Pt composite photocatalysts are successfully prepared by the combination method of bio‐reduction, sol deposition, and calcination. The layers of g‐C3N4 are thinned, and both SiC and Pt nanoparticles are simultaneously tightly bound to g‐C3N4 by calcination during the preparation of g‐C3N4‐SiC‐Pt. The heterojunction formed at the interface of SiC and g‐C3N4 enhances the separation efficiency of the photogenerated electron–hole pairs. These composite photocatalysts achieve a high hydrogen evolution rate of 595.3 μmol h−1 g−1 with 1 wt% of deposited Pt, which is 3.7‐ and 2.07‐fold higher than those of g‐C3N4‐bulk and g‐C3N4‐SiC under visible light irradiation with a quantum efficiency of 2.76% at 420 nm, respectively.

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