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以环氧树脂为炭质前驱体将TiO2粉体粘附于ACF表面,然后在N2气氛460℃焙烧,树脂热解、逸失使剩余残炭成为二者之间的连接体,获得TiO2/ACF复合产品。ACF负载TiO2后,其比表面积降低,但仍很好地维持了ACF的孔隙结构。由SEM可知,纳米级单体TiO2颗粒以微小团簇结构分布于ACF表面。以对氨基苯酚、亚甲基兰和β-环状糊精三种不同分子尺寸的有机化合物为探针,通过TiO2/ACF对它们的光催化降解研究发现,化合物自身分子尺寸对其降解程度有重要影响。具有适宜分子尺寸亚甲基兰的去除程度最高,TiO2/ACF的降解速率高于悬浮态P25,在重复利用过程中未见降低。通过对比三种有机分子在有、无紫外光照下的去除程度,可确认有机分子是被降解而非吸附于TiO2/ACF上。
The TiO2 powder was adhered to the surface of ACF with epoxy resin as carbonaceous precursor and then calcined at 460 ℃ in N2 atmosphere. The resin was pyrolyzed and the remaining carbon remained as the linker between the two. The TiO2 / ACF composite product. After the TiO2 was loaded with ACF, its specific surface area decreased, but the pore structure of ACF was still well maintained. It is known from the SEM that the nano-scale monomeric TiO2 particles are distributed on the surface of the ACF with a micro-cluster structure. With p-aminophenol, methylene blue and β-cyclodextrin three different molecular sizes of organic compounds as a probe, through the photocatalytic degradation of TiO2 / ACF study found that the degree of degradation of their own molecular size of the compound there Significant influence. The removal rate of methylene blue with suitable molecular size was the highest, the degradation rate of TiO2 / ACF was higher than that of suspended P25, and no reduction was found in the process of reuse. By comparing the degree of removal of the three organic molecules with or without UV light, it is confirmed that the organic molecules are degraded rather than adsorbed on the TiO2 / ACF.