ZnBO: Efficient Borate Photocatalyst with Fast Carrier Separation for Photodegradation of Tetracycline.

There is a need for photocatalysts with efficient photocarrier separation to address issues with environmental pollution. Photocarrier separation is largely determined by the orbital composition near the band edge. Here, we investigate ZnBO as an efficient photocatalyst for photodegradation of tetracycline. Theoretical calculations of ZnBO show that the valence band near the Fermi level is composed of d and p orbitals whereas the bottom of the conduction band is composed of s and p orbitals; thus, a large value of / is derived from the band dispersion. The characteristics of this orbital composition promote separation of photoexcited carriers, leading to a high transfer efficiency of the catalyst. Moreover, photodegradation experiments demonstrate that the photocatalytic activity of ZnBO is approximately 5.2 times as high as that of SnO. This study provides insights that might aid the development of novel borate-based environmental photocatalysts with superior performance.