Sulfidation enhances stability and mobility of carboxymethyl cellulose stabilized nanoscale zero-valent iron in saturated porous media.
Sulfidation enhances stability and mobility of carboxymethyl cellulose stabilized nanoscale zero-valent iron in saturated porous media.
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硫化增强了饱和多孔介质中羧甲基纤维素稳定的纳米级零价铁的稳定性和流动性。
DOI：
10.1016/j.scitotenv.2020.137427
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发表时间：
2020-02
影响因子：
9.8
通讯作者：
He Feng
中科院分区：
文献类型：
--
作者：
Gong Li;Shi Shasha;Lv Neng;Xu Wenqiang;Ye Ziwei;Gao Bin;O'Carroll Denis M;He Feng
硫化可以提高纳米零价铁（nZVI）的反应活性和寿命，但对其在饱和多孔介质中的命运和运输的影响知之甚少。比较了羧甲基纤维素（CMC）稳定的nZVI （CMC-nZVI）和硫化的nZVI （CMC- s -nZVI）颗粒在饱和多孔介质中的稳定性和迁移率。硫化后CMC-S-nZVI的水动力尺寸比CMC- nzvi大100-150 nm，这是由于CMC与S-nZVI上的FeSxphase之间的双齿桥接作用增强了CMC在S-nZVI表面的吸附作用。值得注意的是，它们具有相似的核心大小和ζ电位。与CMC-nZVI相比，在相同的离子条件下（Na+, K+< 200 mM; Al3+< 0.75 mM）， CMC-S-nZVI在55 min内表现出更少的物理沉降（0-5% vs. 5-73%）和化学溶解（2-10% vs. 3-27%）。柱穿实验表明，CMC-S-nZVI和CMC-nZVI在饱和多孔介质中具有较高的迁移率。但在大多数实验条件下（如不同离子类型和浓度、流速、输入浓度），CMC-S-nZVI表现出更大的突破（C/C0= 0.57-1.0）和相应的质量回收率（C/C0= 0.44-1.0）。拟合的胶体过滤理论模型与实验结果吻合较好。这项工作表明，除了在其他研究中证明的显著的反应性和寿命改善外，CMC-S-nZVI还比CMC-nZVI更具流动性，这表明CMC-S-nZVI具有许多有利于现场应用的特性。
Sulfidation can enhance the reactivity and longevity of nanoscale zero-valent iron (nZVI), but little is known about its effect on the fate and transport of nZVI in saturated porous media. This work compared the stability and mobility of carboxymethyl cellulose (CMC) stabilized nZVI (CMC-nZVI) and sulfidated nZVI (CMC-S-nZVI) particles in saturated porous media. After sulfidation, the hydrodynamic size of CMC-S-nZVI was 100–150 nm larger than CMC-nZVI due to enhanced adsorption of CMC onto the S-nZVI surface, which was facilitated by the bidentate bridging interaction between CMC and the FeSxphase on S-nZVI. Of note is that they had a similar core size and zeta potential. In comparison to CMC-nZVI, CMC-S-nZVI exhibited less physical settling (0–5% vs. 5–73%) and chemical dissolution (2–10% vs. 3–27%) within 55 min under the same ionic conditions (Na+, K+< 200 mM; Al3+< 0.75 mM). Column breakthrough experiments showed that both CMC-S-nZVI and CMC-nZVI had relatively high mobility in saturated porous media. However, CMC-S-nZVI exhibited greater breakthrough (C/C0= 0.57–1.0) and corresponding greater mass recovery rates than the corresponding CMC-nZVI (C/C0= 0.44–1.0) under most of the experimental conditions (e.g., different ion type and concentration, flow rate, and input concentration). The fitted colloid filtration theory model was in good agreement with experiments. This work suggests that in addition to the significant reactivity and longevity improvements demonstrated in other studies, CMC-S-nZVI is also more mobile than CMC-nZVI suggesting that CMC-S-nZVI has many of the characteristics favorable for field application.
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影响因子：
11.4
作者：
Xia Tianjiao;Qi Yu;Liu Jing;Qi Zhichong;Chen Wei;Wiesner Mark R.
通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/j.scitotenv.2018.09.003
发表时间：
2019-02
期刊：
The Science of the total environment
影响因子：
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作者：
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通讯作者：
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