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Graphitic carbon nitride (g-C3N4) nanosheets have attracted widespread interest in the construction of advanced separation membranes. However, dense stacking and a single functionality have limited the membrane development. Here, an advanced two-/three-dimensional (2D/3D) g-C3N4/TiO2@MnO2 membrane is constructed by intercalating 3D TiO2@MnO2 nanostructures into g-C3N4 nanosheets. The 3D flower-like nanostructures broaden the transport channels of the composite membrane. The membrane can effectively separate five oil-in-water (O/W) emulsions, with a maximum flux of 3265.67 ± 15.01 L·m−2·h−1·bar−1 and a maximum efficiency of 99.69% ± 0.45% for toluene-in-water emulsion (T/W). Meanwhile, the TiO2@MnO2 acts as an excellent electron acceptor and provides positive spatial separation of electrons–holes (e−–h+). The formation of 2D/3D heterojunctions allows the material with wider light absorption and smaller bandgap (2.10 eV). These photoelectric properties give the membrane good degradation of three different pollutants, with about 100% degradation for methylene blue (MB) and malachite green (MG). The photocatalytic antibacterial efficiency of the membrane is also about 100%. After cyclic experiment, the membrane maintains its original separation and photocatalytic capabilities. The remarkable multifunctional and self-cleaning properties of the g-C3N4 based membrane represent its potential value for complex wastewater treatment.
This work was supported by the Fundamental Research Funds for the Central Universities, CHD (Nos. 300102312403 and 300102313208), the Shaanxi Key Research & Development Project (No. 2022GY-403), the Innovation Capability Support Program of Shaanxi (No. 2023-CX-TD-43), and the China Postdoctoral Science Foundation (No. 2020M683395).