Preparation Of Composite Photocatalysts And Their Photocatalytic Performance

People pay much attention to the new and clean production because of global environmental pollution and ecological damage. Pollution of organic dyes is main problems for the sustainable development, photocatalytic technology providing new ways for solving this difficult problem. Therefore, it is highly desirable to develop,modify photocatalysts in the field of dealing with organic dyes pollution.In our work, we design and synthesize a series of organic, inorganic and their composites on the basis of polymerization, hydrothermal, water bath and so on. The photocatalytic performances of the samples were evaluated by decolorization of dyes and then selected the superior composites. The samples were characterized using X-ray diffraction patterns（XRD）, scanning electron microscopy（SEM）, photoluminescence（PL）, UV–vis Diffuse Reflectance spectroscopy（DRS） and investigated the removel organic dyes. The mainly specific research contents are as follows:1. A series of PPy/Bi₂O₂CO₃ composites were synthesized via a facile hydrothermal process only using 2.45 g Bi（NO₃）₃·5H₂O and 0.5 g urea as precursors and self-made PPy as raw materials and investigated by pothocatalytic degradation under 300 W Xenon lamp irradiation. The as-prepared PPy/Bi₂O₂CO₃ products show higher photocatalytic activity than pure Bi₂O₂CO₃, and the 0.75 wt.% PPy/Bi₂O₂CO₃ exhibits maximun performance in the degradation of Rh B under UV light irradiation. a possible photocatalytic mechanism of the PPy/Bi₂O₂CO₃ photocatalysts was proposed.2. The composite Zn₃（OH）₂V₂O₇·2H₂O/g-C₃N₄ was synthesized with self-made g-C₃N₄ as raw materials via a facile water bath at 70 ℃ for 10 h. The results indicated presence of Zn₃（OH）₂V₂O₇·2H₂O increased surface areas and promoted the charge separation, exerted great influence on the absorption capacity and photocatalytic activity of g-C₃N₄, and 5.0 wt.% Zn3（OH）2V2O7·2H2O/g-C₃N₄ composite showed the highest photocatalytic activity.