基于光谱分析探讨磷酸与焦磷酸改性生物炭的磷素形态

doi:10.3964/j.issn.1000-0593(2022)10-3084-07

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Abstract They can be applied to agriculture by changing the properties of biochar by phosphoric acid (H₃PO₄) and pyrophosphoric acid (H₄P₂O₇) . It is helpful to revealing the bio-availability of P on its surface for identifying P occurrence form and binding mode of changed biochar for H₃PO₄ and H₄P₂O₇. This paper adopts wheat stalk biochar (WBC) and cotton stalk biochar (CBC) as raw materials. Meanwhile, this paper prepares changed H₃PO₄ (P-WBC and P-CBC) and changed biochar of H₄P₂O₇ (PA-WBC and PA-CBC) by H₃PO₄ and H₄P₂O₇ respectively. This paper adopts Raman spectroscopy (Raman) and scanning electron microscopy (SEM) to characterize the structure and P distribution of the changed biochar. In addition, this paper adopts Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) to investigate the P-binding mode of changed biochar surface. Meanwhile, this paper quantitatively analyzes the changes of P form and content in biochar before and after changing by combining the Hedley phosphorus classification method with visible spectro-photometry. The result shows that the I_G/I_D value of biochar increases and the graphitization structure enhances to form the P-containing granular structure after changing the properties of H₃PO₄ and H₄P₂O₇. It has promoted the formation of carboxyl (—COOH), P—O—P and P—H acid functional groups on the surface of biochar for changes of H₃PO₄ and H₄P₂O₇. They are similar to functional groups on the surface of changed biochar of H₃PO₄ and changed biochar of H₄P₂O₇. XPS result shows that it increases by 13.15%～32.44% significantly by compared with WBC and CBC for the relative content of O1s peak in the changed treatment. Meanwhile, it also shows that it increases by 18.54%~27.02% significantly for the relative content of the P(2s) peak (p<0.05). They have divided P(2s) and O（1s） into C—P—O, C—O—P, OPO, CO and (or) PO, C—O—C and (or) P—O—C and P—O—P for the deconvolution integral peaks. It can promote the formation of C—O—P, OPO, C—O—C and/or P—O—C and P—O—P bonds for the changed properties of H₄P₂O₇ by comparing with the changed properties of H₃PO₄. It also significantly increases the total P content in biochar for the changed properties. Meanwhile, it is significantly higher than that in P—WBC and P—CBC for the P content in PA-WBC and PA-CBC. The active P content in the changed treatment significantly increases by 2.36~14.77 g·kg^-1 compared with WBC and CBC. In addition, the stable P content significantly decreases by 0.06~0.17g·kg^-1 (p<0.05). The active P and moderate active P of PA-WBC and PA-CBC significantly increase by 5.27~15.66 and 0.53~0.64 g·kg^-1 respectively. The stable P content decreases by 0.03~0.34 g·kg^-1 (p<0.05). In conclusion, it has changed the binding mode of P on biochar surface and increased the activity of P for the changed properties of H₃PO₄ and H₄P₂O₇. The difference in the content and binding mode of P in different forms between H₃PO₄ and H₄P₂O₇ modified biochar are of great significance for further exploring the bioarailability of P.

Key words：Biochar; Modification; Phosphorus species; Spectral analysis

Received: 2021-08-04 Accepted: 2022-01-27

ZTFLH:

O657.3

Corresponding Authors: JIA Hong-tao E-mail: jht@xjau.edu.cn

Cite this article:

WANG Xu-yang,SUN Tao,ZHU Xin-ping, et al. Phosphorus Species of Biochar Modified by Phosphoric Acid and Pyrophosphoric Acid Based on Spectral Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(10): 3084-3090.

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2022)10-3084-07 OR http://www.gpxygpfx.com/EN/Y2022/V42/I10/3084