Abstract
For decades, photocatalytic semiconductor materials were regretfully limited to low-yield preparation method and poor catalytic efficiency although it has dramatically captured attention in sewage treatment applications. To expand this slim range of semiconductor catalysts, the nanocrystalline silver embedded in titanium dioxide (Ag-TiO2) heterojunction was prepared by means of facile mechanical milling technique capable of large-scale production, in terms of optimum Ag content. The as-obtained Ag-TiO2 nanocomposite particles were systematically characterized by means of X-ray diffraction technique, Raman spectra, X-ray photoelectron spectroscopy, transmission electron microscopy analysis, and UV-vis spectrophotometry. Results suggest that in comparison with pure TiO2 catalyst, Ag-TiO2 nanocomposite catalyst significantly enhanced photocatalytic activity for the degradation of methylene blue (MB), whereas its band gap decreased in view of the red-shift phenomenon. In terms of the experimental results, a mechanism was proposed to explain the enhancement of photocatalytic activity. Our findings offer a promising route towards the large-scale preparation of high-efficiency photocatalysts for commercial applications.
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