کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
234128 | 465388 | 2010 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The first-principle study of the effect of lattice impurity on adsorption of CN on sphalerite surface The first-principle study of the effect of lattice impurity on adsorption of CN on sphalerite surface](/preview/png/234128.png)
The adsorption of CN on sphalerite (1 1 0) surface and the effects of lattice impurities on the surface adsorption have been investigated using density-functional theory (DFT). The results show that CN adsorbs strongly on perfect sphalerite (1 1 0) surface, where C atom and N atom of CN molecule are bonding with two Zn atoms on the surface. The presence of Fe/Mn/Cu-impurity on sphalerite surface was shown to enhance the CN adsorption, however; Cd impurity worked in the opposite. The adsorption mode of CN on defective surfaces is mainly via C atom interacting with the impurity atom, and s orbital of C interacts with sp orbital of Fe/Mn/Cu to form the covalent bond, and d orbital of Fe/Mn/Cu donates electrons to the anti-bonding p orbital of C to form the back donating π bonding. While on the Cd-bearing surface, Cd 4d orbital donates fewer electrons to the vacant π2p∗ of C, and thus no back donating π bonding appears and the adsorption of CN on Cd-bearing sphalerite surface is weak. The simulations of CN adsorption show that Fe-bearing sphalerite could be easily depressed by cyanide, while Cd-bearing sphalerite is difficult to be depressed by cyanide.
Journal: Minerals Engineering - Volume 23, Issue 9, August 2010, Pages 676–684