Self-Template-Derived Hollow Brookite TiO2@Na2Ti3O7–Ag 1D@2D-0D Nanoarchitectures with Amine Modification Promote Photocatalytic CO2 Reduction

Using amine-modified protonated titanate (NH₂–H₂Ti₂O₅·3H₂O) as a template, surface reconstruction is carried out by hydrothermal treatment in the NaOH/ethylene glycol (EG)/H₂O system, and finally, Ag nanoparticle-loaded 1D@2D TiO₂@Na₂Ti₃O₇ nanoarchitectures (TiO₂@Na₂Ti₃O₇–Ag) have been fabricated. The corresponding formation process is analyzed by using XRD, SEM, and EDX techniques. XPS and Fourier transform infrared (FT-IR) spectra confirm the presence of surface amino groups. Photo/electrochemical measurements indicate that the loading of Ag⁰ is beneficial for light absorption, charge separation, and transfer of 1D@2D TiO₂@Na₂Ti₃O₇ nanoarchitectures. The best CH₄ and CO yields in the photocatalytic CO₂ reduction test on the TiO₂@Na₂Ti₃O₇–Ag_0.025 photocatalyst are 9.01 and 0.88 μmol/g/h, which are improved nearly 64 and 44 times, respectively. The generation of the *HCOO^–, *CO, and *OCH₃ intermediates corresponding to the reaction pathway is studied by in situ FT-IR. These findings could pave ways for the development of efficient photocatalytic CO₂ conversion systems.