Structural Characteristics and Adsorption of Phosphorus by Pineapple Leaf Biochar at Different Pyrolysis Temperatures

文献类型： 外文期刊

第一作者： Song, Shuhui

作者： Song, Shuhui;Liu, Siru;Liu, Yanan;Shi, Weiqi;Ma, Haiyang;Song, Shuhui

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关键词： pineapple leaf biochar; pyrolysis temperatures; structural characteristics; phosphorus; adsorption

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

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年卷期： 2024 年 14 卷 12 期

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收录情况： SCI

摘要： Biochar is a potential material for making slow-releasing phosphorus (P) fertilizers for the sake of increasing soil P-use efficiency. The adsorption of phosphorus by pineapple leaf biochar (PB) prepared at different pyrolysis temperatures and its mechanism remain unclear. In order to study the effect of preparation temperature on the structural characteristics of biochar from pineapple leaves and the adsorption of phosphorus by biochar, pineapple leaves were used as raw materials to prepare biochar by restricting oxygen supply at 300 degrees C, 500 degrees C, and 700 degrees C. The structural characteristics and adsorption of phosphorus by pineapple leaf biochar at different temperatures (PB300, PB500, and PB700) were analyzed. The results showed the following: (1) The pore structure of biochar pyrolysis at 300 degrees C (PB300) did not significantly change, while the surface structure of biochar pyrolysis at 700 degrees C (PB700) significantly changed, the specific surface area (S-BET) increased by 26.91 similar to 37.10 times that observed in PB300 and PB500, and the pore wall became thinner. (2) The number of functional groups (C=O) in PB700 decreased, and the relative content of C-H/-CHO in PB500 and PB700 increased by 4.38 times that observed in PB300. (3) The adsorption of phosphorus by biochar was a multi-molecular layer chemisorption, accompanied by single-molecular-layer physical adsorption and intramolecular diffusion. For PB300, both the physical and chemical processes of the adsorption of PO43- by biochar were weakened, and the chemical process was dominated by cationic (Ca2+, Mg2+, Fe3+, and Al3+) adsorption at 500 degrees C. For PB700, the physical adsorption dominated by pore size structure was the main process, and the physicochemical adsorption at 700 degrees C was significantly stronger than that observed at 300 degrees C and 500 degrees C. These results indicate that biochar prepared at 500 degrees C can save energy in the preparation process and has excellent physical and chemical structure, which can be used as the basic material for further modification and preparation of biochar phosphate fertilizer.

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