Z-type electronic structure and enhanced photocatalytic performance of silver tungstate – phosphorus and aluminum co-doped zinc oxide heterogeneous catalysts

Abstract

The Z-type electronic structure visible-light-driven silver tungstate–phosphorus and aluminum co-doped zinc oxide (Ag₂WO₄−PAZO) heterogeneous catalyst was synthesised by a facile hydrothermal method, wherein the proposed Z-type photocatalytic mechanism was supported by the characterisation of X-ray photoelectron spectroscopy, UV–vis diffuse reflection spectroscopy, reactive species, etc. The photocatalytical capacity was demonstrated by degrading the tetracycline hydrochloride (TC-HCl) antibiotics, and it was necessary to eliminate serious pollution caused by the abuse of TC-HCl. In addition, the heterogeneous catalyst showed higher photoactivity than single PAZO or Ag₂WO₄ catalyst, which was due to its lower photoexcited electron-hole separation. Multiple measurements were applied to characterise the morphology and optical property of the heterogeneous catalyst. The Ag₂WO₄−PAZO heterogeneous materials also showed more stability compared with Ag₂WO₄ material.

Keywords:

• Ag₂WO₄–PAZO heterogeneous catalyst
• TC-HCl degradation
• Z-type photocatalytic mechanism

Acknowledgments

We appreciate Dr. Zhang Yan (Doctor of Language) for improving the English.