In this paper, a core-shell N-TiO 2 @CuO x nanomaterial with increased visible light photocatalytic activity was successfully synthesized using a simple method. By synthesizing ammonium titanyl oxalate as a precursor, N-doped TiO 2 can be prepared, then the core-shell structure of N-TiO 2 @CuO x with a catalyst loading of Cu on its surface was prepared using a precipitation method. It was characterized in detail using XRD, TEM, BET, XPS and H 2 -TPR, while its photocatalytic activity was evaluated using the probe reaction of the degradation of methyl orange. We found that the core-shell N-TiO 2 @CuO x nanomaterial can lessen the TiO 2 energy band-gap width due to the N-doping, as well as remarkably improving the photo-degradation activity due to a certain loading of Cu on the surfaces of N-TiO 2 supports. Therefore, a preparation method for a novel N, Cu co-doped TiO 2 photocatalyst with a coreshell structure and efficient photocatalytic performance has been provided.
Three supported Au catalysts have been prepared by the deposition‐precipitation method by using the active carbon (AC), SiO2‐AC, and SiO2‐AC‐hollowed. The 3 supports were characterized by Brunauer‐Emmett‐Teller and scanning electron microscopy. Meanwhile, the supported Au nanoparticles were also characterized in detail by X‐ray powder diffraction, transmission electron microscopy, H2‐TRP, and X‐ray photoelectron spectroscopy, and their catalytic activity and stability in CO oxidation was evaluated. The results demonstrated that Au supported on SiO2‐AC‐hollowed exhibited much higher catalytic activity with acceptable stability for 72 hours than the other 2. We attributed to finer supported Au nanoparticles with abundant low‐coordinated Au atoms on the surfaces of hollowed supports with large special surface area and abundant pore structure. In summary, we successfully found an efficient and cheap method to prepare catalysts with high catalytic activity and acceptable stability by modifying the inactive supports.
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