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使用与酸盐合的磁性污泥生物炭去除Pb污染:固化和稳定行为以及电子促进机制

Nazhafati Muhanmaitijiang¹, Xin Hu¹, Dan Shan²

¹School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

International journal of biological macromolecules

|May 31, 2024

概括

这项研究开发了磁性-生物炭-凝微球 (MBGB) 来有效地从水中去除 (Pb2+). MBGB显著提高了Pb2+的吸附能力和吸附率,为污染补救提供了稳定和可重复使用的解决方案.

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:

(Pb) 污染对环境和人类健康构成重大风险.
生物炭改造是提高重金属修复的关键策略.
通过先进的封装技术,可以提高泥生物炭 (SB) 修复能力.

研究的目的:

开发和评估磁性-生物炭-凝微球 (MBGB) 以实现高效的Pb2+吸附和被动化.
研究MBGB上的Pb2+的吸附行为和被动化机制.
评估MBGB的稳定性,可重复使用性和环境安全性,用于污染水处理.

主要方法:

污泥生物炭 (SB) 与藻酸盐凝 (GB) 和磁性Fe3+封装,形成MBGB.
吸附实验包括动力学,同热学和pH值研究.
矿物学和电化学分析以阐明被动化机制.
四步提取分析以确定Pb2+的稳定性.
循环吸附-脱附试验,以评估可重复使用性.

主要成果:

与SB相比,MBGB表现出明显更高的Pb2+吸附能力 (108.4%的增加) 和率 (200%的增加).
在广泛的pH范围 (3-9) 中有效吸附,多层吸附涉及物理和化学机制.
证明了Pb²⁺的方向扩散到MBGB,加速电子转移,以及稳定的矿物沉 (Pyromorphite).
吸附Pb²⁺的高稳定性 (36.2%可溶于酸,47.6%不可生物利用) 和持续的效率 (>93.0%) 在三个循环后.

结论:

MBGB是一种高效且稳定的材料,可用于污染水中的Pb²⁺.
磁性生物炭和凝矩阵的协同作用增强了吸附和被动化.
MBGB提供了卓越的可重复使用性和环境安全性,为控制污染提供了有前途的解决方案.

关键词:

电子转移是电子的转移.Fe 负载负载.凝封装的凝封装方式污泥生物炭是一种生物炭.固化 / 稳定固化 / 稳定

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