每周分享2.19-云海官网

synthesis of nanosized 尾-bi2o3 on a large-scale is a great challenge due to its metastable state. a facile l-asparagine-assisted reflux-calcination route was successfully developed for the large-scale preparation of 尾-bi2o3 micro/nanostructures under mild conditions (low temperature, atmospheric pressure, and wide temperature window). the composition, phase structure, morphology, surface area, and photoabsorption properties of as-synthesized 尾-bi2o3 and its precursor were systematically characterized. the phase transformation conditions and possible formation mechanism of flower-like 尾-bi2o3 were discussed. it is found that with a simple reflux process at 100 掳c under atmospheric pressure, uniform monodisperse bismuth-asparagine complex microspheres with average diameters of ~500 nm were produced, then flower-like 尾-bi2o3 micro/nanostructures were conveniently obtained after calcining the precursor at temperatures ranging from 340 to 420 掳c. a surface co32- coordination effect introduced from l-asparagine was explained the formation of stabilized 尾-bi2o3 at low temperature (up to 420 掳c). the as-synthesized 尾-bi2o3 shows excellent photocatalytic activity toward the degradation of 4-phenylphenol under visible-light irradiation, which is 3.7 and 21.4 times faster than the removal rates of 尾-bi2o3 nanospheres and a commercial 尾-bi2o3, respectively, and allows for the elimination of 93.2% total organic carbon after 60 min of irradiation. in addition, the photogenerated reactive species were identified by radical scavenger experiments and electron paramagnetic resonance spectroscopy, then a possible visible-light-induced photocatalytic mechanisms was proposed.

该文章中材料表征采用的是美国麦克仪器asap 2460

详情可参考下面链接：

http://pubs.rsc.org/en/content/articlelanding/2015/ra/c5ra13985f#!divabstract