以酚醛树脂为碳源的碳改性TiO_2可见光光催化剂

Carbon-Modified TiO_2 Visible Light Photocatalyst Prepared Using Phenolic Resin as Carbon Source

以合成的水溶性酚醛树脂(PF)和TiO2为原料,在N2气氛下焙烧制备了碳改性TiO2催化剂PF/TiO2,并采用X射线衍射、扫描电子显微镜、X射线光电子能谱和紫外-可见漫反射吸收光谱对样品进行了表征.结果表明,PF/TiO2催化剂具有和原料TiO2相同的晶相和形貌,且在可见光区产生明显的吸收.另外,在样品表面存在Cn,C-OH(C-O-C)和C=O(COO)物种,表明其表面存在石墨C材料.这证实沉积在TiO2表面的PF在焙烧过程中发生了碳化.以甲基橙为模型污染物,在可见光下评价了PF/TiO2的光催化性能,发现PF/TiO2的光催化剂活性大大高于TiO2.当PF用量为2%时,PF/TiO2中碳含量为1.33%,此时催化剂的可见光光催化活性最高.

A carbon-modified titanium dioxide photocatalyst,PF/TiO2,was prepared by calcining self-prepared phenolic resin （PF） and TiO2 in N2 atmosphere.The as-prepared PF/TiO2 samples were characterized by X-ray diffraction,scanning electron microscopy,X-ray photoelectron spectroscopy （XPS）,and UV-Vis diffuse reflectance spectroscopy.PF/TiO2 has similar crystal phase and morphology to raw TiO2 and has significant absorption in the visible region.The XPS observed the presence of Cn,C-OH（C-O-C）,and C=O（COO） species,which confirms that there is graphite carbonaceous matter on the surface of PF/TiO2.During the calcination,the phenolic resin on the surface of PF/TiO2 has been carbonized.The photocatalytic performance of PF/TiO2 under visible light was evaluated by the degradation of methyl orange.The photocatalytic activity of PF/TiO2 is greatly higher than that of bare TiO2.The PF dosage for preparing PF/TiO2 with the highest visible light photocatalytic activity is 2%,corresponding to a carbonaceous matter content of 1.33% in PF/TiO2.