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Multi-heterostructure interfaces of CoAlLa-LDH with porous g-C₃N₄ on monolayer Ti₃C₂-MXene was designed to get double-S-scheme heterojunction through in situ grown titania nanoparticles using a single-step ultrasonic assisted hydrothermal approach. The Ti₃C₂ MXene nanotexture embedded TiO₂ NPs provides 3D nanotexture for promoting the interface interaction of g-C₃N₄ with CoAlLa-LDH. The g-C₃N₄/Ti₃C₂T/CoAlLa-LDH dual-S-scheme assembly possesses merits of conductive and semiconductive components with higher charges separation. The photoactivity test was conducted for CO₂ reduction through different re-forming systems such as dry re-forming of methane (DRM) and bi-re-forming of methane (BRM), whereas acidic and basic sites over the composite enabled the attachment of both the CO₂ and CH₄ molecules for their activation under solar energy. The electron rich composite resulted …