Entropy-engineered 2D layered double hydroxides as efficient single-component visible-light photocatalysts for selective NOx removal

• Entropy-engineered 2D LDHs enhance visible-light photocatalysis • Multimetallic LDHs are successfully synthesized by AMOST-assisted co-precipitation • Entropy tuning tailors the conduction and valence band edge positions • Synergistic •OH and •O 2 − generation boosts NO oxidation • The medium-entropy LDH achieves ~48% NO removal with 100% selectivity