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碳氧甲基纤维素稳定诱导了硫化纳米级零价值铁的颗粒特性和脱效率的变化

Li Gong¹, Shuaixuan Ying¹, Chenyun Xia¹

¹College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China.

|March 23, 2024

概括

碳氧甲基纤维素 (CMC) 稳定增强硫化纳米级零价值铁 (S-nZVI) 的三乙烯降解. CMC增强了反应性,但可以增加进化,影响地下水修复中的电子效率.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

聚合物稳定,例如与碳氧甲基纤维素 (CMC),改善纳米级零价值铁 (nZVI) 运输.
硫化增强了nZVI对脱的反应性和选择性.
使用不同的硫源对硫化nZVI (S-nZVI) 的聚合物稳定的影响尚不清楚.

研究的目的:

通过使用各种硫前体,合成和描述CMC稳定S-nZVI (CMC-S-nZVI).
评估CMC稳定对S-nZVI的特性和脱性能的影响.
研究硫前体在CMC-S-nZVI合成和性能中的作用.

主要方法:

使用三种硫前体:硫化物 (S2−),二化物 (S2O42−) 和硫酸盐 (S2O32−) 的CMC-S-nZVI的一步合成.
描述CMC-S-nZVI属性,包括降低硫种度和电子效率.
评估三乙烯 (TCE) 降解速率和与非稳定 S-nZVI 和 nZVI 的比较.

主要成果:

在S-nZVI上,CMC稳定显著增加了减少的硫种 (3.1-7.0倍).
CMC-S-nZVI的降解率比非稳定型S-nZVI高2.2至9.0倍,其中来自Na2S的CMC-S-nZVI的降解率最高.
与nZVI相比,CMC-S-nZVI的电子效率显著增加,但与S-nZVI相比,由于粒子水友性增加而增强的演化反应 (HER) 而下降.

结论:

CMC 稳定对 S-nZVI 特性和脱性能产生积极影响.
硫前体的选择会影响CMC-S-nZVI的特性和反应性.
这些发现为设计有效的CMC-S-nZVI用于污染地下水整治提供了指导.

关键词:

碳甲基纤维素的碳甲基纤维素.纳米级的零价值铁在纳米尺度上的零价值铁.硫化硫化剂的存在硫的前体是硫的前体.三乙烯的降解分解

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