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在强烈降雨事件中解锁生物炭的溶液相分子转化:气候变化下的长期碳循环的影响

Yuqing Sun¹, Zibo Xu², Mingjing He³

¹School of Agriculture and Biotechnology, Sun Yat-sen University, Guangzhou, Guangdong 510275, China; Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

The Science of the total environment

|October 9, 2024

概括

土壤中的生物碳稳定性随着湿干周期和降雨而下降. 热解温度和激活影响生物炭.

科学领域:

土壤科学土壤科学
环境化学环境化学
材料科学材料科学材料科学

背景情况:

气候变化加剧降雨,影响土壤生物碳的稳定性.
生物炭的碳捕获潜力受到质疑,因为在环境压力下相转换.
了解生物炭分子转化对于土壤碳管理至关重要.

研究的目的:

在模拟的降雨和湿干循环下分析生物炭的可溶性和固体相中的分子水平转换.
研究生物炭特性如何影响其稳定性和转化途径.
评估不同热解温度和CO2激活对生物炭碳稳定性的影响.

主要方法:

将生物炭 (在450°C和750°C生产,并使用CO2激活) 用模拟雨水进行长时间的湿干循环.
分析分子转换,使用技术来评估表面功能和碳质地.
使用 H2O2 氧化 (以 Æ 表示) 量化碳稳定性.

主要成果:

低温生物炭 (450°C) 呈现氧化和碎片化,释放不稳定的有机碳,稳定性下降 (Æ从60.1%降至53.2%).
高温生物炭 (750°C) 在模拟降雨后表现出有限的变化,并保持稳定.
经过CO2激活的生物炭经历了显著的碎片化,氧化和水合,释放了与素类似的碳,并降低了稳定性 (Æ从81.2%降至73.0%).

结论:

生物炭的转化和稳定性高度依赖于其特性 (热解温度,激活) 和环境条件 (湿干循环,降雨量).
低温和活性生物炭更容易降解,损害了它们的长期碳储存.
结果为设计稳定的生物碳修正案提供了洞察力,以有效地封存土壤碳和缓解气候变化.

关键词:

碳封存是一种碳封存方式.碳的稳定性碳的稳定性溶解的生物炭颗粒/合体溶解的有机物质是有机物质.工程化生物炭设计设计

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