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通过在有氧条件下用化预处理的微米级零铁进行增强 (VI) 去除

Xuejun Long^1,2,3, Rui Li¹, Jun Wan^1,2,3

¹School of Environmental Engineering, Wuhan Textile University, Wuhan 430200, China.

Molecules (Basel, Switzerland)

|May 25, 2024

概括

在用化 (AlCl3) 预腐蚀零价值铁 (ZVI) 之前,可以有效地从水中去除六价值 (Cr(VI)). 这种增强的ZVI材料克服了被动化,显示了废水处理和地下水整治的巨大潜力.

科学领域:

环境化学环境化学
材料科学材料科学材料科学
水处理技术水处理技术

背景情况:

零价值铁 (ZVI) 用于六价值 (Cr(VI)) 的去除,但遭受被动化,限制其实际应用.
开发强大的ZVI材料对于有效的废水和地下水整治至关重要.

研究的目的:

在有氧条件下通过与化 (AlCl3) 进行预腐蚀来增强Cr(VI) 通过ZVI去除.
研究预先条件ZVI (pcZVI-AlCl3) 的特性和Cr(VI) 去除机制.

主要方法:

使用ZVI,AlCl3和4小时的预条件期,优化了腐蚀前条件.
使用57Fe Mössbauer光谱法进行预先条件ZVI的表征.
通过连续流体实验评估了Cr(VI) 的去除.

主要成果:

最佳条件:2.5 g/L ZVI,0.5 mM AlCl3,4小时的预调.
pcZVI-AlCl3含有49.22%的ZVI,34.03%的Fe3O4和16.76%的FeOOH. 这是一个很好的结果.
OH) 3的形成改善了零电荷的pH点 (pHzpc) 和增强了CrVI的吸附.
ZVI和腐蚀产品之间的协同电子转移促进了Cr (VI) 的去除.
移除机制包括吸附,减少和沉,吸附的贡献较小.

结论:

使用AlCl3进行预腐蚀提供了一种新的策略,可以提高ZVI的寿命和Cr (VI) 去除效率.
pcZVI-AlCl3在Cr(VI) 除污染方面显示出在现场应用的巨大潜力.
协同效应和改善的表面特性有助于提高修复性能.

关键词:

清除Cr (VI) 的方法吸附吸附是一种吸附.在腐蚀前的防腐.减少减少减少减少没有价值铁的零价值铁.

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