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
粉体圈首页
