EXAFS study of adsorbed Cu(II) on fly ashes with different residual carbon contents.
This work studied the speciation of copper species adsorbed onto the surface of fly ash using X-ray absorption spectroscopy (XAS). Experimental results verified that the chemical bond between Cu(II) and the surface of the fly ash was Cu-O. The data set was optimally fitted into the two atomic shells: the first shell containing O atoms and the second shell containing Cu atoms. The extended X-ray absorption fine structure (EXAFS) data also show that, in the first shell, about 2.03-2.41 nearest oxygen atoms surround the center Cu atom with a Cu-O bond distance of 1.96-1.99 A. The results further demonstrated that the bond distance slightly increased with an increasing carbon content of the fly ash.
Lin
Chien-Jung
CJ
Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan, ROC. mcjlin@mail.chna.edu.tw
Chang
Juu-En
JE
D000327:Adsorption; D002244:Carbon / Q000032:analysis* / Q000737:chemistry*; D060729:Coal Ash; D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification; D008903:Minerals / Q000737:chemistry; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry* / Q000302:isolation & purification; D052638:Particulate Matter; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties
D060729:Coal Ash; D008903:Minerals; D052638:Particulate Matter; D002244:Carbon; D003300:Copper; D010100:Oxygen