Mn、N共掺杂TiO_2负载竹质活性炭纤维的制备及可见光光催化性能

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。

Preparation and visible light photocatalytic properties of Mn-N co-doped TiO2 loaded bamboo based activated carbon fibers

In order to investigate the visible light photocatalytic properties of Mn-N co-doped TiO2 loaded bamboo based activated carbon fibers (Mn-N/TiO2-BACF),using MnSO4 ·H2 O as manganese source and urea as nitrogen source,photocatalytic composites Mn-N/TiO2-BACF were prepared by sol-gel method firstly.Then,the effects of calcination temperature on the structure and visible light photocatalytic properties of Mn-N/TiO2-BACF were inves-tigated by SEM,XRD and XPS etc.The results indicate that the photoresponse edge of photocatalytic composites extends from ultraviolet light region to visible light region upon Mn-N co-doping.With increasing calcination tem-perature,the lattice oxygen content on the surfaces of photocatalytic composites decrease gradually,absorbed oxy-gen content decreases firstly and then increases,while hydroxyl oxygen content increases.After illuminating for 400 min,the photodegradation ratio for methylene blue of Mn-N/TiO2-BACF prepared by calcined at 350 ℃ reaches 9 9.7% under visible light.Moreover,it is also found that the photodegradation rate of Mn-N/TiO2-BACF under visible light has no correlation with calcination temperature.