Review on the improvement of the photocatalytic and antibacterial activities of ZnO

Comparison of modification strategies towards enhanced charge carrier separation and photocatalytic degradation activity of metal oxide semiconductors (TiO2, WO3 and ZnO)

Remediation of wastewater using various nano-materials

A review of visible light-active photocatalysts for water disinfection: Features and prospects

Defects play important roles in semiconductor photocatalysis, which not only can act as active sites but also serve as recombination centers for electrons and holes. The rational control of defects appears to be particularly important. Defect engineering in semiconductor electron–hole separation is complex but vital for photocatalysis, and the exact control of defects still presents a great challenge. This review endeavors to clarify the inherent functionality of different defects such as bulk defects and surface/interface defects. The common defects such as oxygen vacancies and Mn+ defects have been summarized and discussed. The controllable creation of defects could lead to defect channels via defect–strain coupling, defect–defect and defect–electron interactions, which contribute to the enhancement in electronic conductivity and the separation of photogenerated electron–hole pairs. The deep understanding of defects can consolidate the fundamental photocatalytic theory and provide new insights for rationally designing defect-engineered semiconductor photocatalytic materials with satisfactory performance.

Zheng Wang

Papers

Surface defects control for ZnO nanorods synthesized by quenching and their anti-recombination in photocatalysis