Jian-yuan JING, Liang YUAN, Shui-qin ZHANG, Yan-ting LI, Bing-qiang ZHAO. Multispectral Structural Characterization of Humic Acid-Enhanced Urea[J]. Spectroscopy and Spectral Analysis, 2022, 42(8): 2610
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 8, 2610 (2022)
Fig. 1. FTIR spectra (a) and second derivative spectra (b) of urea (U), humic acid-enhanced urea (HAU), and humic acid (HA)
Fig. 2. The XPS full spectra (a) and C(1s ) peak fitting spectra of HA (b), HAU20 (c), and U (d)
Fig. 3. XPS N(1s ) peak fitting spectra of HA (a), HAU20 (b), and U (c)
Fig. 4. Oxygen K-edge NEXAFS spectra of HA, U, and HAU20
Fig. 5. FTIR spectra of HA and UHA (a) and XPS C(1s ) peak fitting spectra of UHA (b)
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Table 1. XPS peaks (C1s ) attribution and the relative content (%) of carbon species for HA, HAU20 and U
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Table 2. XPS peaks [N(1s )] attribution and the relative content (%) of nitrogen species for HA, HAU20, and U
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