| 王科记,张秦,王育来,武敬,谢文萍.硅酸盐矿物改性对秸秆水热炭特征与稳定性的影响及其机制[J].农业环境科学学报,2026,45(5):1317-1328. |
| 硅酸盐矿物改性对秸秆水热炭特征与稳定性的影响及其机制 |
| Influence and mechanism of silicate minerals on the characteristic and stability of straw hydrochar |
| 投稿时间：2025-05-08 |
| DOI：10.11654/jaes.2025-0421 |
| 中文关键词: 秸秆废弃物 水热炭化 矿物改性 稳定性 |
| 英文关键词: straw waste hydrothermal carbonization mineral modification stability |
| 基金项目:国家重点研发计划项目（2021YFC3201202） |
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| 摘要点击次数: 23 |
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| 中文摘要: |
| 为提高秸秆水热炭的性能，本实验利用不同添加量的两种硅酸盐矿物(高岭石和蒙脱石)对小麦秸秆进行改性水热炭化，制备了高岭石改性水热炭(5% KHC和15% KHC)和蒙脱石改性水热炭(5% MHC和15% MHC)。特征分析结果表明，与不添加矿物处理(HC)相比，15% KHC和15% MHC的产率分别增加了7.32%和6.15%，且改性水热炭表面出现明显的层状结构，其中5% MHC的比表面积显著提高了2.59倍。同时，KHC和MHC的电导率、阳离子交换容量和pH值均高于HC，其中pH值分别增加了0.38~0.69个和0.55~0.74个单位。然而，与HC相比，KHC和MHC的C、H、N含量有所下降，而O含量分别显著提高了1.69%~18.97%和14.14%~30.02%。此外，H2O2氧化条件下，与HC相比，15% KHC和15% MHC的碳损失率分别增加了35.35%和36.01%；但热解结果表明，15% KHC和15% MHC的热稳定性分别提高了8%和6%。以上水热炭的稳定性变化可能与其有机组分有关，分析表明，KHC的溶解性有机质含量显著降低，而MHC则相反，但二者有机质组分中富里酸的比例均明显增加，可能是矿物与水热炭的相互作用影响了成炭过程。研究表明，矿物改性能够有效提高水热炭的产率、比表面积和热稳定性，增加其化学活性。 |
| 英文摘要: |
| In order to improve the performance of straw hydrochar, two kinds of silicate mineral(kaolinite and montmorillonite)with different dosage have been applied to modify wheat straw through hydrothermal carbonization in this study, to harvest the kaolinite modified hydrochar(5%KHC and 15%KHC) and montmorillonite modified hydrochar(5%MHC and 15%MHC). As shown by the results of hydrochars' characteristic analysis, compared with the no-mineral treatment(HC), the yields of 15% KHC and 15% MHC were increased by 7.32% and 6.15% respectively, on which distinct layered structures were found, among which the specific surface area of 5% MHC has significantly increased by 2.59 times. Meanwhile, the electrical conductivity, cation exchange capacity, and pH of the KHC and MHC were higher than that of HC. Specifically, the pH of KHC and MHC were increased by 0.38-0.69 and 0.55-0.74. However, the contents of C, H, and N in KHC and MHC were lower than that in HC, while the O content was increased significantly by 1.69%-18.97% and 14.14%-30.02% in KHC and MHC compared with HC. Moreover, under the oxidization of H2O2, compared with HC, the carbon loss rates of 15%KHC and 15%MHC were increased by 35.35% and 36.01%, respectively. Nevertheless, the results of pyrolysis showed that the thermal stabilities of 15%KHC and 15%MHC were increased by 8% and 6%, respectively. Those stability changes of hydrochars might be related to their organic matters. The analysis showed that the dissolved organic carbon of KHC was generally lower than that of HC, which was opposite in MHC, along with the proportion of fulvic acid in dissolved organic matter was distinctly increased in both of them. This might be attributed to the influence of the interactions between the minerals and hydrochar on carbonization processing. In summary, mineral modification could effectively enhance its yield, specific surface area, and thermal stability, and promote its chemical activity. |
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