热解温度决定了中枢骨中石灰衍生生物炭对重金属的固定机制和选择性
Xiaoqing Cai1, Manxian Hong1, Jiaqi Ren2
1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China.
Environmental geochemistry and health
|January 22, 2026
概括
来自Medulla stachyuri (MS) 的高温生物炭有效地去除了诸如 (Pb2+) 和铜 (Cu2+) 等重金属. 该研究显示,降水是温度较高的关键机制,可确保稳定高效的整治.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学 化学 化学
背景情况:
- 重金属污染对水生和陆生生态系统构成重大风险.
- 生物质衍生生物炭是一种有前途的吸收剂,但其有效性取决于原料和热解条件.
- 在多金属系统中了解温度驱动的吸附机制对于新的生物炭应用至关重要.
研究的目的:
- 为了研究在不同热解温度下对Pb2+和Cu2+的Medulla stachyuri (MS) 衍生生物炭的吸附行为.
- 阐明潜在的吸附机制和温度对这些过程的影响.
- 为了评估生物炭的稳定性和选择性,以便去除重金属.
主要方法:
- 在400,600和800°C准备MS生物炭 (MBCs).
- 对Pb2+和Cu2+单独和二进制系统的吸附实验.
- 生物炭特性 (表面积,功能组,灰含量) 的表征.
- 机理学研究,包括组件贡献分析和脱吸试验.
主要成果:
- 较高的热解温度增加了特定表面积和灰含量,提高了吸附能力.
- MBC-800显示出优越的吸附能力:Pb2+为2139.25 mg/g,Cu2+为970.68 mg/g. MBC-800显示出优越的吸附能力:Pb2+为2139.25 mg/g,Cu2+为970.68 mg/g.
- 吸附机制从表面复杂化转变为在较高温度下以降水为主.
- 在MBC-800中的水溶性成分占Pb2+固定的78%以上.
- MBC-800表现出高的Pb2+选择性和优异的稳定性,吸附率低.
结论:
- 高温热解MS产生的高效生物炭用于Pb2+和Cu2+的去除.
- 降水是由固有的无机生物炭成分驱动的,在高温下是主要的机制.
- 由MS衍生的生物炭为重金属整治提供了稳定,选择性和可持续的解决方案,具有利用药用植物废物的潜力.
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