Synergistic Photothermal-Photocatalytic Accordion-Like Mo2AlB2 MBene Membrane for High-Efficiency Solar-Powered Water Remediation

Addressing the global freshwater crisis demands advanced solutions where solar-driven interfacial evaporation (SDIE) shows promise, yet integrated photothermal-photocatalytic synergy within a single platform remains fundamentally challenging. An accordion-like Mo 2 AlB 2 MBene is pioneered and engineered into a crosslinked MBene/Polyvinylachohol (PVA)/meso-tetra (4-carboxyphenyl) porphyrin (TCPP) composite membrane (MPTM) that synergistically unifies solar harvesting and catalytic degradation. This architecture leverages accordion-like MBene nanosheets and interfacial porphyrin coordination to establish a dynamic hydrophilic network with exceptional broadband absorption (93.3% average, 200–2500 nm). Through Schottky junction formation and charge redistribution, the system achieves unprecedented solar evaporation rates (2.24 kg m − 2 h −1 under 1 sun) while concurrently generating reactive oxygen species (•OH/•O 2 − ) that degrade 98.7% organic pollutants (10 ppm rhodamine B) in 2 h. The MPTM sustains > 85% evaporation efficiency during long-term stability operation (Bohai seawater, 200 h) with < 4% efficiency decay, establishing a new paradigm for solar-powered water purification.