Zinc oxide (ZnO) has been widely used as a photocatalyst for solar energy conversion and treatment of organic pollutants because of its low toxicity and high photocatalytic efficiency. However, the applicability of ZnO in visible light is limited because of the wide band gap of the material, which results in low efficiency during solar photoconversion. In this paper, we report the facile one-pot, morphology-controlled, and large-scale synthesis of carbon-doped ZnO through urea-assisted thermal decomposition of zinc acetate. Nanorods and nanospheres of carbon-doped ZnO were successfully prepared by using this one-step method with various weight percent of urea. The photocatalytic activities of nanocrystals obtained with different morphologies and carbon contents were evaluated through degradation of methylene blue with visible light irradiation. Results showed that incorporation of carbon decreases the energy band gap of ZnO, improves the separation efficiency of its electron-hole pairs, and significantly enhances the visible light photocatalytic activity.

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The equiatomic multiprincipal CoCrFeCuNi and CoCrFeMnNi high-entropy alloys (HEAs) were consolidated via high pressure sintering (HPS) from the powders prepared by the mechanical alloying method (MA). The structures of the MA'ed CoCrFeCuNi and CoCrFeMnNi powders consisted of a face-centered-cubic (FCC) phase and a minority body-centered cubic (BCC) phase. After being consolidated by HPS at 5 GPa, the structure of both HEAs transformed to a single FCC phase. The grain sizes of the HPS'ed CoCrFeCuNi and CoCrFeMnNi HEAs were about 100 nm. The alloys keep the FCC structure until the pressure reaches 31 GPa. The hardness of the HPS'ed CoCrFeCuNi and CoCrFeMnNi HEAs were 494 Hv and 587 Hv,

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