以Bi(NO3)3·5H2O为原料,天然棉花为模板结合热处理工艺,成功合成了具有网状结构的三斜晶相Bi2O3光催化材料,利用XRD、SEM、TG-DTA和UV-Vis漫反射等技术对样品的晶型结构、形貌及吸光性能等进行了表征.以亚甲基蓝染料分子模拟环境污染物,考察了样品的光催化性能.结果表明,棉花纤维在网状Bi2O3的制备中起到了充分的诱导作用,这种网状结构是由一些直径不一的Bi2O3扁平状网线交错排列、稀疏盘结而形成.TGA分析结果表明,适当的热处理在去除棉花模板的同时可以实现Bi3+→Bi2O3的转化.在可见光照射下,网状Bi2 O3的光催化活性及重复使用性能均优于粉体Bi2O3,反应100min后,对MB的脱色率可达到93%左右,并且重复使用4次后仍可使MB的脱色率保持在85%以上.此外,对网状Bi2O3的形成机理进行了探讨.
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