Highly Efficient Degradation of Methyl Orange by g-C3N4 Nanosheets Doped with Noble Metal Silver Under Simulated Sunlight

Photocatalytic technologies capable of using solar energy for environmental restoration have much progressed with the increasing environmental concern.In this investigation,novel Ag@g-C3N4 nanocomposite was synthesized by thermal polycondensation and simple liquid phase reduction method with g-C3N4 using melamine and urea as nitrogen sources. A series of characterization for Ag@g-C3N4 nanocomposites was carried out by X-ray polycrystalline diffraction electron microscopy、UV diffuse reflection and Physical adsorption. The electrochemical properties of the composite materials were studied by open circuit potential and AC impedance. The technolgy for degradation of methyl orange solution stimulated waste water was studied, the best conditions of processing were obtained: The Ag@g-C3N4 nanocomposites concentration of which is 0.2 g/L,the of the volume of 30% H2O2 was 30 ml/L and time of degradation was 3h. The study revealed that the catalysts prepared have optical light-absorbing property, high surface area, and stability. The results were shown that g-C3N4@Ag nanocomposite can effectively inhibit the recombination of photogenerated electrons and holes, and their electron transfer ability and photocatalytic characteristics are better than g-C3N4 nanosheets for novel metal Ag. Most notably, with preserved reactivities, this heterogeneous Ag@g-C3N4 composite can be used at least 5 times. Advantages of this method are green solvent, mild condition and reusable catalyst.