Question

TiO2 has a bandgap that is suited to absorb IR radiation

Answer 1

In TiO4 oxidation state of Ti is +4 .......
it shows that Ti ^+4...do not have unpaired electron. ...hence it is colourless...
also, all the colourless. ...compound of d-block absorbs infrared rediation...
your statement is 100% true

Answer 2

TiO2 anatase assumes a focal job in vitality and ecological research. A noteworthy bottleneck toward creating fake photosynthesis with TiO2 is that it just ingests bright light, inferable from its substantial bandgap of 3.2 eV. On the off chance that one could diminish the bandgap of anatase to the unmistakable locale, TiO2-based photocatalysis could turn into a focused clean vitality source.

Here, utilizing filtering burrowing microscopy and spectroscopy related to thickness utilitarian hypothesis computations, we report the revelation of an exceptionally receptive titanium-ended anatase surface with a diminished bandgap of under 2eV, extending into the red part of the sun oriented range. By tuning the surface planning conditions, we can reversibly switch between the standard anatase surface and the newfound low bandgap surface stage.