Self-Template-Derived Hollow Brookite TiO<sub>2</sub>@Na<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>–Ag 1D@2D-0D Nanoarchitectures with Amine Modification Promote Photocatalytic CO<sub>2</sub> Reduction
Gang Cheng, Xinyu Tong, Wuxia Zhang, Wei Chen, Jinyan Xiong
Abstract
Using amine-modified protonated titanate (NH 2 –H 2 Ti 2 O 5 ·3H 2 O) as a template, surface reconstruction is carried out by hydrothermal treatment in the NaOH/ethylene glycol (EG)/H 2 O system, and finally, Ag nanoparticle-loaded 1D@2D TiO 2 @Na 2 Ti 3 O 7 nanoarchitectures (TiO 2 @Na 2 Ti 3 O 7 –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 Ag 0 is beneficial for light absorption, charge separation, and transfer of 1D@2D TiO 2 @Na 2 Ti 3 O 7 nanoarchitectures. The best CH 4 and CO yields in the photocatalytic CO 2 reduction test on the TiO 2 @Na 2 Ti 3 O 7 –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 *OCH 3 intermediates corresponding to the reaction pathway is studied by in situ FT-IR. These findings could pave ways for the development of efficient photocatalytic CO 2 conversion systems.