酸盐提高了硫化零价值铁的长期脱性能:被动化和现场氧化之间的权衡
Jiaming Guo1, Yinghao Shi1, Honghong Lyu2
1MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Environmental science & technology
|September 9, 2025
概括
酸盐的添加增强了老化硫化零价值铁 (S-ZVI) 用于化碳化合物的修复. 它平衡了被动化和腐蚀,通过产生反应性氧物种来促进三乙烯的脱.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 硫化零价值铁 (S-ZVI) 在化碳化合物修复中有效.
- 由于高溶氧 (DO) 环境中的腐蚀,S-ZVI面临着挑战.
- 了解S-ZVI衰老对于优化补救策略至关重要.
研究的目的:
- 调查酸盐在减轻老化S-ZVI的被动化和氧化腐蚀中的作用.
- 评估酸盐对三乙烯 (TCE) 老化S-ZVI脱性能的影响.
- 阐明酸盐增强老化S-ZVI的氧化还原活性的机制.
主要方法:
- 在受控条件下S-ZVI的老化.
- 在有或没有酸盐的情况下,用老化的S-ZVI处理TCE污染水.
- 电化学分析以确定电子电阻.
- 分析反应动力学和降解能力.
- 表面物种和溶解物种的表征.
主要成果:
- 添加酸盐显著改善了老化S-ZVI的脱性能.
- 酸盐降低了18.9%的电子电阻,并增加了23.3%的氧化脱.
- 脱速率常数和降解能力分别增加了61.1%和85.7%.
- 酸盐促进了二氧化的脱聚合,减轻了被动化,并增强了铁铁溶解和ROS生产.
结论:
- 酸盐作为一个关键的添加剂,以平衡老化S-ZVI的被动化和氧化腐蚀.
- 酸盐通过促进ROS生成,增强了还原性和氧化性脱路径.
- 这些发现为开发基于S-ZVI的强大的整治技术提供了新的策略.
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