In the present study a simple and convenient solution route to grow submicron-sized CuO structures onto the surface of g-C3N4 was demonstrated and the upgraded visible-light-driven photocatalytic activity of the as-prepared composite was revealed. The buildup of CuO(4.4 wt%.) /g-C3N4 p-n heterojunction was successfully accomplished via two-step ammonia- evaporation-induced synthetic approach. The resulting inorganic/organic composite was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, thermogravimetry, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy to examine its phase structure, valence state, microstructural, thermal and optical properties. Its photocatalytic efficiency was tested using Malachite Green photodegradation in natural seawater and the results indicated that CuO/g-C3N4 is much more active than the individual components in the photodegradation of MG. A plausible photocatalytic mechanism was also proposed.
In the course of our studies on the synthesis of porous metals by de-alloying of amorphous precursors the present work was devoted to the influence of alloy composition and conditions of selective dissolution of palladium based glasses on the microstructure of the final porous material. More pronounced three-dimensional ligament structure was found at the chemically de-alloyed glasses compared to those treated electrochemically. Noticeable difference in the size of the pores and ligaments between chemically and electrochemically partially dissolved Pd30Ni50Si20 glasses compared to Pd40Ni40Si20 was also observed. Superior catalytic activity towards oxidation of ethanol of the porous metal prepared by de-alloying Pd30Ni50Si20 compared to that of the de-alloyed Pd40Ni40Si20 was established.
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