| 范润川,郝才伟,李文博,朱英,郑蕾,程红光,杨凯.物理老化对不同秸秆生物炭理化性质和热稳定性的影响[J].农业环境科学学报,2026,45(5):1168-1178. |
| 物理老化对不同秸秆生物炭理化性质和热稳定性的影响 |
| Effects of physical aging on the physicochemical properties and thermal stability of different straw biochars |
| 投稿时间：2025-06-18 |
| DOI：10.11654/jaes.2025-0564 |
| 中文关键词: 老化 生物炭 理化性质 结构特征 热稳定性 稳定性系数 |
| 英文关键词: aging biochar physicochemical properties structural characteristics thermal stability recalcitrance index |
| 基金项目:国家自然科学基金项目（41907095）；山东省自然科学基金项目（ZR2021ME214）；西藏玉曲河扎拉水电站施工扰动区生态修复规划及生态技术研究（CDT-YQH-ZL-X-[2023]-005） |
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| 中文摘要: |
| 为探究物理老化对秸秆生物炭理化性质和热稳定性的影响，采用干湿交替和冻融循环2种人工加速老化方法对不同热解温度(300、400、500℃)下制备的小麦秸秆生物炭(WBC300、WBC400、WBC500)和玉米秸秆生物炭(MBC300、MBC400、MBC500)进行老化试验，对比分析新鲜和老化生物炭的理化性质和热分解特征，并采用稳定性系数(R50)评估其固碳潜力。结果表明：相同温度下制备的WBC表现出更高的芳香化程度，而MBC因其更高灰分含量显示出更强的稳定性。制备温度的升高通过促进碳化反应提升了生物炭的芳香化程度和R50。干湿交替和冻融循环老化通过表面氧化反应使生物炭pH值降低、亲水性和极性增强。2种老化处理均导致500℃生物炭的介孔数量增加，从而使其比表面积增大，其中干湿交替的周期性蒸发作用对孔隙结构的改造更为显著，这种效应在MBC500中表现最为突出。2种老化处理均使WBC500的热稳定性明显增强，但却均导致MBC300和MBC400的热稳定性降低，这种差异主要源于原料组分和氧化程度不同。不同温度下制备的WBC经2种老化处理后R50显著提升了2.18%~5.80%，而仅MBC500经干湿交替老化后R50显著增加了2.31%。研究表明，高温秸秆生物炭经老化后具有更优的孔隙结构和固碳潜力，且受原料特性影响显著。 |
| 英文摘要: |
| To investigate the effect of physical aging on the physicochemical properties and thermal stability of straw biochars, two artificial accelerated aging methods, including wet-dry cycling and freeze-thaw cycling, were applied to wheat straw biochar(WBC300, WBC400, WBC500)and maize straw biochar(MBC300, MBC400, MBC500)produced under different pyrolysis temperatures(300, 400 ℃, and 500 ℃). The physicochemical properties and thermal decomposition characteristics of fresh and aged biochars were compared, and the recalcitrance index(R50)was used to assess their carbon sequestration potential. The results showed that under the same pyrolysis temperature, WBC exhibited higher aromaticity, while MBC demonstrated greater stability due to its higher ash content. Increasing pyrolysis temperature enhanced both the aromaticity and R50 of biochar via promoting the carbonization reactions. Wet-dry and freeze-thaw cycling reduced the pH while increasing the hydrophilicity and polarity of biochar via inducing oxidation on its surface. Both aging treatments increased the mesopore quantity in WBC500 and MBC500, thus increasing their specific surface areas. The periodic evaporation of wet-dry cycling had a more pronounced effect on the modification of pore structure, which is particularly evident in MBC500. Both aging treatments obviously increased the thermal stability of WBC500 but reduced that of MBC300 and MBC400, which is mainly attributed to the differences in feedstock composition and oxidation degree. The two aging treatments significantly increased the R50 of WBC samples produced under different pyrolysis temperatures by 2.18%-5.80%, while only wet-dry cycling significantly increased the R50 of MBC500 by 2.31%. This study demonstrates that aged high-temperature straw biochars possess superior pore structure and carbon sequestration potential, which is significantly influenced by feedstock characteristics. |
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