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为研究Mn、N共掺杂TiO_2负载竹质活性炭纤维(Mn-N/TiO_2-BACF)的可见光光催化性能,首先,以MnSO_4·H_2O为锰源,尿素为氮源,采用溶胶-凝胶法制备了光催化复合材料Mn-N/TiO_2-BACF;然后,利用SEM、XRD及XPS等考察了煅烧温度对Mn-N/TiO_2-BACF结构和可见光光催化性能的影响。结果表明:Mn、N共掺杂使光催化复合材料的光响应范围由紫外光区域拓宽至可见光区域;随煅烧温度的提高,光催化复合材料表面的晶格氧含量逐渐降低,吸附氧含量先降低后增加,而羟基氧含量有所增加;光照400min后,350℃锻烧制备的Mn-N/TiO_2-BACF在可见光下对亚甲基蓝的光降解率达99.7%。同时,还发现Mn-N/TiO_2-BACF在可见光下的光降解率与煅烧温度没有相关性。
In order to study the visible light photocatalytic activity of Mn, N co-doped TiO 2 supported bamboo activated carbon fiber (Mn-N / TiO 2 -BACF), firstly, MnSO 4 · H 2 O was used as manganese source and urea as nitrogen source. The photocatalytic composite material Mn-N / TiO_2-BACF was prepared. The effect of calcination temperature on the structure and photocatalytic activity of Mn-N / TiO_2-BACF was investigated by SEM, XRD and XPS. The results show that the co-doping of Mn and N broadens the photoresponse range of the photocatalytic composite from the UV region to the visible region. With the increase of calcination temperature, the lattice oxygen content on the surface of the photocatalytic composite material decreases gradually. Decreased and then increased, while the content of hydroxyl oxygen increased. After photoluminescence for 400min, the photodegradation rate of methylene blue in Mn-N / TiO_2-BACF prepared by calcination at 350 ℃ reached 99.7%. At the same time, it was also found that the photodegradation rate of Mn-N / TiO_2-BACF in visible light has no correlation with the calcination temperature.