Abstract
Abstract Nitrogen-doped together with gold-loaded TiO 2 (Au/N–TiO 2 ) nanoparticles were prepared by a simple wet-chemical method. The samples were characterized by XRD, TEM, XPS, UV–vis diffuse reflectance spectroscopy, and photoluminescence (PL) spectroscopy. It reveals that Au was loaded on the surface of TiO 2 in the form of metallic Au, and nitrogen is introduced into TiO 2 matrix in the form of substitutional nitrogen and interstitial nitrogen. Au/N–TiO 2 exhibits much higher visible-light photocatalytic activity when compared with single N-doped or Au-loaded TiO 2 . A synergetic effect was proposed to explain the effects of nitrogen doping and Au loading on enhancing the visible-light photocatalytic activity of TiO 2 .
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