A self-assembly of carbon nitride (C3N4) and layered double hydroxide (LDH) was constructed by electrostatic interaction. The pristine nitrate-intercalated Mg-Al-LDH is turned to carbonate LDH through anion exchange during the photoreduction of CO2 in aqueous solution. The carbonate anions enriched in the interlayer of LDH exhibit a remarkably high reduction efficiency to CH4 in the presence of a C3N4 photoabsorber and Pd cocatalyst.
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