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研究采用水热法制备了花状Bi_2WO_6与TiO_2和Bi-TiO_2相复合的光催化剂,并使用新型LED节能灯为光源催化氧化室内甲醛.研究发现,粉末态Bi_2WO_6显示出花状结构,但无光催化氧化活性,而将Bi_2WO_6粉末与TiO_2和Bi-TiO_2复合后,两者相互作用所形成异质结结构形态,尤其Bi_2WO_6/Bi-TiO_2催化剂,所制样品展示出更佳的催化氧化活性,而经浸渍法所得样品几乎无光催化氧化活性,催化剂随着TiO_2和Bi-TiO_2含量的增加,复合催化剂显现出不尽相同的氧化活性规律,其中Bi_2WO_6与Bi-TiO_2质量比为1∶2样品表现最佳,36 h催化氧化甲醛转化率高达92.2%,甲醛浓度低于我国居室空气中甲醛最高容许浓度,且催化剂显示出良好的稳定性及重复性.
The photocatalysis of flower-like Bi_2WO_6 complexed with TiO_2 and Bi-TiO_2 phase was prepared by hydrothermal method and the formaldehyde was catalyzed by a new LED energy-saving lamp as light source.The results showed that the flower-like structure of Bi_2WO_6 was found in powder state, However, the Bi 2 WO 6 / Bi-TiO 2 catalyst exhibited a better catalytic oxidation activity when the Bi 2 WO 6 powder was composited with TiO 2 and Bi-TiO 2. The samples obtained by the soaking method showed almost no photocatalytic oxidation activity. The catalytic activity of the composite catalysts varied with the content of TiO 2 and Bi-TiO 2, and the mass ratio of Bi 2 WO 6 to Bi-TiO 2 was 1: 2 The best formaldehyde conversion rate was 92.2% after 36 h of catalytic oxidation and the formaldehyde concentration was lower than the highest allowable concentration of formaldehyde in room air in China. The catalyst showed good stability and repeatability.