Assembly of recyclable TiO2@AC/CTs through vdW-integrated strategy for photocatalytic and photoelectrocatalytic oxidation

So far, the recyclable photocatalysts for large-scale has hardly been mature so far because traditional chemical epitaxial growth are typically limited to materials with highly lattice matching and processing compatibility. Therefore photocatalytic degradation of pollutants suffers from the dispersion and recycle of powdery photocatalysts from water. To address this issue, a commercial P25 nanospheres are coated with amorphous carbon (AC) to form TiO2@AC core-shell nanospheres, which physically integrates with a commercial carbon textiles (CTs) through van der Waals (vdW) interaction to assemble flexible TiO2@AC/CTs. Those commercial materials are suitable for industrial production of TiO2@AC/CTs, which can greatly promote industrial applications of photocatalytic technology. Density functional theory (DFT) calculation reveals that the photo-excited electron tends to transfer from TiO2 to amorphous carbon, which significantly enhance the separation of an electron from a hole in TiO2@AC core-shell nanosphere. The photoelectrocatalysis of TiO2@AC/CTs exerts unexpected performance through synergistic interactions of photocatalysis and electrocatalysis. TiO2@AC/CTs achieve a higher cycle stability than P25 during photocatalytic and photoelectrocatalytic process, which can address the issue of dispersion and recycle technique of particulate photocatalysts and significantly reduce the recycle cost. The assembly of amorphous carbon-coated P25 and CTs into vdW heterostructures through vdW-integrated strategy can be a general rule to integrate other powdery photocatalysts with CTs to assemble recyclable carbon textile-based catalysts for industrial applications of photocatalysis and photoelectrocatalysis.

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