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通过在空气和还原性气氛中煅烧铁离子掺杂的锐铁矿纳米粉体,并且采用水热合成法制备了具有锐铁矿结构的纳米管,研究了它们的微结构和物理化学行为。研究发现,与在空气中煅烧相比,还原性气氛下煅烧引入了低价态Fe~(2+)和Ti~(3+)离子以及更多的表面吸附氧,纳米管的比表面积、亚甲基蓝吸附能力以及光吸收阈值得到显著提高。1%(摩尔分数)Fe掺杂以及还原处理产生了最高的吸附和光催化活性及其降解持久性,过多掺杂反而降低了光催化性能。此外,水热合成引起纳米管的含铁量下降。
The nanotubes with anatase structure were prepared by calcining iron ions doped anatase nanopowder in air and reducing atmosphere, and their microstructure and physico-chemical behavior were studied. It was found that the calcination of the low-valent Fe 2+ and Ti 3+ ions and more surface-adsorbed oxygen, the specific surface area of nanotubes, Adsorption capacity and light absorption threshold have been significantly improved. 1% (molar fraction) Fe doping and reduction treatment have the highest adsorption and photocatalytic activity and the durability of the degradation, excessive doping but reduced photocatalytic performance. In addition, hydrothermal synthesis leads to a decrease in the iron content of nanotubes.