Xu-yang WANG, Tao SUN, Xin-ping ZHU, Guang-mu TANG, Hong-tao JIA, Wan-li XU. Phosphorus Species of Biochar Modified by Phosphoric Acid and Pyrophosphoric Acid Based on Spectral Analysis[J]. Spectroscopy and Spectral Analysis, 2022, 42(10): 3084
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 10, 3084 (2022)
Fig. 1. Raman spectra of the wheat straw (a) and cotton stalk (b) biochars before and after modification
P- and PA- represent modified by H3PO4 and H4P2O7, respectively, Same below
P- and PA- represent modified by H3PO4 and H4P2O7, respectively, Same below
Fig. 2. SEM image and the corresponding P elemental mapping images of the wheat straw (a) and cotton stalk (b) biochars before and after modification
Fig. 3. FTIR spectra of the wheat straw (a) and cotton stalk (b) biochars before and after modification
Fig. 4. XPS spectra and the relative content of characteristic peaks of wheat straw (a) and cotton stalk (b) biochars before and after modification
Fig. 5. High-resolution P(2p ) (a, b) and O(1s ) (c, d) spectra of the wheat straw and cotton stalk biochars before and after modification
Fig. 6. Changes of phosphorus relative content of the wheat straw (a) and cotton stalk (b) biochars before and after modification
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Table 1. Basic properties of biochar
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