Bag Santanu, Trikalitis Pantelis N, Chupas Peter J, Armatas Gerasimos S, Kanatzidis Mercouri G
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
Science. 2007 Jul 27;317(5837):490-3. doi: 10.1126/science.1142535.
Inorganic porous materials are being developed for use as molecular sieves, ion exchangers, and catalysts, but most are oxides. We show that various sulfide and selenide clusters, when bound to metal ions, yield gels having porous frameworks. These gels are transformed to aerogels after supercritical drying with carbon dioxide. The aerogels have high internal surface area (up to 327 square meters per gram) and broad pore size distribution, depending on the precursors used. The pores of these sulfide and selenide materials preferentially absorb heavy metals. These materials have narrow energy gaps (between 0.2 and 2.0 electron volts) and low densities, and they may be useful in optoelectronics, as photocatalysts, or in the removal of heavy metals from water.
无机多孔材料正在被开发用作分子筛、离子交换剂和催化剂，但大多数是氧化物。我们表明，各种硫化物和硒化物簇与金属离子结合时，会产生具有多孔骨架的凝胶。这些凝胶在经过二氧化碳超临界干燥后转变为气凝胶。根据所使用的前驱体不同，气凝胶具有高的内表面积（每克高达327平方米）和宽的孔径分布。这些硫化物和硒化物材料的孔隙优先吸收重金属。这些材料具有窄的能隙（在0.2到2.0电子伏特之间）和低密度，它们可能在光电子学、作为光催化剂或从水中去除重金属方面有用。
