Speciation of copper in micropores

• Published in: Water, air, and soil pollution air, and soil pollution, 2004-03, Vol.153 (1-4), p.187-194
• Main Authors: HUANG, Y.-J, WANG, H. Paul, HSIAO, M. C, TAI, C. C, HUANG, Hsin-Liang, LIU, S. H
• Format: Article
• Language: English
• Subjects: Applied sciences; Biological and physicochemical properties of pollutants. Interaction in the soil; Channel pores; Copper; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Environmental monitoring; Exact sciences and technology; Pollution; Pollution, environment geology; Soil and sediments pollution; Soil contamination; Soil pollution; Speciation; Spectroscopy; Superconductivity; Zeolites
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1023/B:WATE.0000019941.13703.0a

Speciation of copper in the micropores of zeolites and a contaminatedsoil was studied by extended X-ray absorption fine structural (EXAFS) spectroscopy. The Fourier transformed EXAFS data showed that copper oxide in zeolites ZSM-5 and ZSM-48 possessed a Cu-O bond distance of 1.95 Å with coordination numbers (CNs) of 1-2. Since ZSM-5 and ZSM-48 possessed channel openings of 5-6 Å, the possible sizes of the linear-type copper oxides in these confined pores were 2.93-2.95 . However, in the supercages (13 Å) and channels (7.4 Å) of zeolite Y, a three dimensional structure of CuO was observed. Interestingly, we found that CuO in the Cu-contaminated soil had a similar structure to that in ZSM-5 or ZSM-48. Nevertheless, the EXAFS data indicated that the CNs of Cu-O and Cu-O-Cu were 0.4 and 0.3, respectively, suggesting a highly perturbed copper oxide in the irregular micropores of the contaminated soil.[PUBLICATION ABSTRACT]