Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Recently, as a potential solution handling environmental pollutants, photo-catalysis using an effective semiconductor has been a research focus, particularly for the elimination of hazardous materials in polluted water [1-2]. Among various semiconductors, ZnO has been considered as an excellent photocatalyst candidate with respect to its high photosensitivity, non-toxicity, abundant availability, low cost, etc. [3] However, the practical application of unitary ZnO materials still confronts two challenges, i.e., the limited absorption spectrum range within UV light (<387 nm) [5] and severe recombination of