Hsiao M C, Wang H Paul, Wei Y L, Chang Juu En, Jou C J
Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan, ROC.
J Hazard Mater. 2002 Apr 26;91(1-3):301-7. doi: 10.1016/s0304-3894(02)00015-8.
The speciation of copper and zinc in the incineration fly ash of a municipal solid waste in Taiwan was investigated in the present work. By the least-squares fitted X-ray absorption near edge structural (XANES) spectroscopy, we found that CuCO3, CuOH2, and CuO (fractions of 0.09, 0.39 and 0.51, respectively) were the main copper species in the fly ash. Quantitative analysis of the extended X-ray absorption fine structural (EXAFS) spectra indicated that the bond distance of Cu-O in the fly ash was 1.96 A with a coordination number (CN) of 3.9 in the first shell of copper. In the second shell, the bond distance and CN of Cu-(O)-Cu were 2.91 A and 2.7, respectively. In addition, speciation of Zn was also examined in the same X-ray absorption energy (8780-9970 eV). The bond distance of Zn-O and Zn-O-Zn were 1.97 and 2.94 A, respectively. However, the Zn-O-Cu structure was not found because of the physically unreasonable sigma(2) (Debye-Waller factor) values in the EXAFS data fitting process.
本研究对台湾某城市固体废弃物焚烧飞灰中铜和锌的形态进行了调查。通过最小二乘法拟合的X射线吸收近边结构（XANES）光谱，我们发现碳酸铜、氢氧化铜和氧化铜（分别占比0.09、0.39和0.51）是飞灰中主要的铜物种。对扩展X射线吸收精细结构（EXAFS）光谱的定量分析表明，飞灰中铜的第一配位层中Cu-O键长为1.96 Å，配位数（CN）为3.9。在第二配位层中，Cu-(O)-Cu的键长和CN分别为2.91 Å和2.7。此外，还在相同的X射线吸收能量（8780 - 9970 eV）下研究了锌的形态。Zn-O和Zn-O-Zn的键长分别为1.97 Å和2.94 Å。然而，由于EXAFS数据拟合过程中物理上不合理的σ²（德拜-瓦勒因子）值，未发现Zn-O-Cu结构。
