茶素共球磨砂商用微型零价值铁,以促进Cr (VI) 的去除
Xiaobing Wang1, Shangbin Yuan1, Jiajia Kong1
1School of Chemistry and Civil Engineering, Shaoguan University, Shaoguan 512023, PR China.
Journal of hazardous materials
|May 24, 2024
概括
茶素改性微零价值铁 (TS-mZVI) 有效地去除了近100%的六价值 (Cr(VI)). 这种增强材料的去除率比未经修改的mZVI高1.43倍,表明其对环境修复的潜力.
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:
- 六价 (Cr(VI)) 构成严重的环境和健康风险.
- 微零价值铁 (mZVI) 是用于Cr(VI) 整治的有希望的材料,但由于效率和副作用可能受到限制.
- 茶叶素 (TS) 是天然的生物表面活性剂,有可能提高mZVI的性能.
研究的目的:
- 开发和评估TS-修改的mZVI (TS-mZVI) 以有效地去除CrVI.
- 调查TS-mZVI.VI增强性能背后的机制.
- 评估TS-mZVI在模拟透反应屏障 (PRB) 中的长期稳定性和有效性.
主要方法:
- 将TS与mZVI进行共同球磨,以合成TS-mZVI.
- 批量实验以确定Cr (VI) 去除效率和动力学.
- 用X射线光电子光谱 (XPS) 和X射线吸收靠近边缘结构 (XANES) 来进行材料特征.
- 模拟PRB列实验以评估长期性能.
主要成果:
- 在2小时内,TS-mZVI实现了近100%的Cr(VI) 清除,比球磨mZVI (BZVI) 高出1.43倍.
- 在Cr(VI) 清除之后,出现了伪二次动力学,TS-mZVI显示了2.83倍更快的清除速度,主要是通过化学吸收.
- TS修改增强了Fe (II) /Fe (0) 暴露和增加了疏水性,将H2演化减少了95%,并提高了电子选择性.
- 在为期10天的模拟PRB实验中,TS-mZVI表现出比BZVI更高的Cr(VI) 消除效率.
结论:
- TS-mZVI 是一种高效的Cr(VI) 清除材料,其性能明显优于BZVI.
- 增强的性能归因于改善的铁物种化和增加的疏水性,导致更好的电子选择性.
- TS-mZVI对环境修复的实际应用有很大的前景,特别是在PRB系统中.
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