摘要
设计制造了具有负离子功能的稀土-半导体氧化物组装材料,并进行了自由基的测试。测试表明,该材料不仅在紫外光照射条件下能产生大量活性氧自由基,而且在无光照条件下也能产生大量活性氧自由基,突破了常规半导体氧化物不能在可见光条件下催化的难点。同时表明,材料所产生的自由基量与负离子量有直接对应关系。这意味着,在稀土离子的光催化及变价的氧化-还原过程中存在羟基自由基转化为负离子的可能。依此提出了在光催化作用下稀土离子与材料表面吸附的H2O和O2的循环变化模型图。
Materials with function in producing negative ions effection, containing valency-variable rare-earth elements and semiconductor oxide, were fabricated . Negative ions and free radicals produced by the materials were tested and the corresponding relationship between them. Due to the valency-variable mechanism, the rare-earth ions could excite the semiconductor oxide to produce quite a few free radicals no
matter whether it is under illumination of ultraviolet radiation or not, which enable semiconductor oxide to photo-catalyse under visible light. During redox process of valency-variable rare-earth, free radicals translate into negative ions. A circulational model was present involving rare-earth with water and oxygen absorbed on the surface of materials.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第4期567-570,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(59672029)
国家高技术发展计划863项目(2001AA322050)
关键词
催化化学
负离子材料
变价稀土
自由基
稀土
catalytic chemistry
negative ion materials
value-variable rare-earth
free radical
rare earths
