摘要:报道自1972年日本科学家Fujishima和Honda首次曝光TiO2光催化分解反应以来，半导体光催化技术已成为降解污染物和太阳能在该领域最正确的选择，在环境保护领域具有很大的应用潜力。石墨碳氮化物（g-C3N4）是具有堆叠二维层状结构的让可见光响应的非金属的半导体光催化剂。由于其合适的带隙，高热稳定性和化学稳定性以及无毒性，已成为光催化，电化学等领域的热点。g-C3N4具有化组成多样，生物相容性稳定性好的优点，但也有光诱导电子空穴复合和比表面积低等严重问题，导致在低光催化量子效率较低时，不容易普及其在能源和环境领域的应用。制备g-C3N4基复合光催化剂，提高光生电子-空穴对的分离效率是最需要面对的问题。
本文以三聚氰胺为前驱，在690℃下制备了g-C3N4原料。实验采用超声辅助水热法，在片层结构g-C3N4表面搭载纳米颗粒三氧化钨（WO3）,合成WO3/g-C3N4复合光催化剂。通过X-射线粉末衍射、扫描电镜、透射电镜、傅立叶红外光谱仪器等测试方法对其结构、形貌进行表征。通过催化降解RhB实验对样品光催化活性做出评价。并对实验过程中影响晶体生长的可控条件水热反应时间、催化剂焙烧温度做出调控，探究最适反应时间、焙烧温度对复合光催化剂性能的影响。在查阅文献后发现，g-C3N4与WO3在1：1的情况下，催化剂活性最高、实验结果表明，以1:1的g-C3N4与WO3复合，在190℃的水温下。反应6h，所制备的光催化剂具有最高的催化活性。
关键词:复合光催化剂，g-C3N4/WO3，水热法，罗丹明B
Abstract:Since 1972 Japanese scientists reported since Fujishima and Honda first exposure TiO2 photocatalytic decomposition reaction, semiconductor photocatalytic technology has become the most correct choice of degradation of pollutants and solar energy in the field, has great application potential in the field of environmental protection. Graphitic carbon nitride (g-C3N4) is a nonmetallic semiconductor photocatalyst with a stacked two-dimensional layered structure that allows visible light response. Due to its suitable band gap, high thermal stability and chemical stability, as well as non-toxic, it has become a hot spot in photocatalysis, electrochemistry and other fields. g-C3N4 has multiple compositions, good biocompatibility and good stability, but also the light induced electron hole recombination and low surface area than a serious problem, resulting in low photocatalytic quantum efficiency is low, not easy to popularize its application in the field of energy and environment.
The preparation of g-C3N4 based composite photocatalysts is the most important problem to improve the separation efficiency of photogenerated electron hole pairs.
In this paper, melamine was used as precursor to prepare g-C3N4 raw material at 690 DEG C.This experiment using ultrasound assisted hydrothermal method, the lamellar structure of the surface of g-C3N4 nanoparticles with tungsten trioxide (WO3), synthesis of WO3/g-C3N4 composite photocatalyst. The structure and morphology were characterized by means of X- ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Fu Liye infrared spectrometer. TThe photocatalytic activity of the samples was evaluated by catalytic degradation of RhB experiments. The optimum reaction time and the calcination temperature were investigated for the controlled reaction conditions and the calcination temperature of the catalyst during the experiment..After consulting the literatures, it is found that the activity of the catalyst is the highest under the condition of g-C3N4 and WO3 1:1, and the experimental results show that the mixture of 1:1 with WO3 and g-C3N4 is at the temperature of 190 . The prepared photocatalyst has the highest catalytic activity in the reaction of 6h.
Keywords:Composite photocatalyst,g-C3N4/WO3,hydrothermal method ,rhodamine B 三聚氰胺前驱g-C3N4/WO3的制备及光催化性能研究:http://www.chuibin.com/wuli/lunwen_205287.html