Effects of Raw Materials and Pyrolysis Temperatures on Physicochemical Properties of Biochars Derived from Hemp Stalks

文献类型： 外文期刊

第一作者： An, Xia

作者： An, Xia;Zhu, Ziyi;Luo, Xiahong;Chen, Changli;Liu, Tingting;Zou, Lina;Li, Shaocui;Zhu, Ziyi;Liu, Yuxue;Liu, Yuxue

作者机构：

关键词： hemp stalk; biochar; pyrolysis temperature; soil amendment; surface functional group

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2025 年 14 卷 16 期

页码：

收录情况： SCI

摘要： Hemp stalk, a widely available agricultural waste, is an ideal eco-friendly raw material for biochar production. Carbonization experiments were conducted as a novel approach for the scalable and value-added utilization of hemp stalk under oxygen-exclusion conditions. The effects of feedstock types-Hibiscus cannabinus (KS), Corchorus spp. (JS), and Boehmeria spp. (RS)-and pyrolysis temperatures on biochar properties were analyzed through the measurements of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy. The pH and electrical conductivity (EC) of biochars increased with increasing pyrolysis temperature. Notably, EC was significantly higher for RS (940-2278 mu S/cm) than for KS (517-879 mu S/cm) and JS (583-863 mu S/cm). The C content in these three biochars increased as the temperature increased, whereas the H/C atomic ratio decreased, most notably in JS (by 0.33%). According to FTIR and XRD data, with the pyrolysis temperature increasing, the acidic oxygen-containing groups on biochar surfaces reduced. KS700, with superior aromatic structure and stability, may be able to effectively adsorb heavy metal ions. RS700, with relatively high pH and EC, was suitable for alleviating soil acidification and nutrient deficiency. The feedstock and pyrolysis temperature significantly affected the element content, pore structure, and stability of biochars derived from hemp stalk.

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