College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China E-mail:
Zhejiang Zone-King Environmental Sci & Tech Co., Ltd, Hangzhou 310014, China.
Water Sci Technol. 2019 Sep;80(6):1076-1084. doi: 10.2166/wst.2019.358.
In this study, starch-stabilized nanoscale zero-valent iron (S-nZVI) was produced using the liquid-phase reduction method. It was used to remove chromium from wastewater, and compared to a commercial nanoscale zero-valent iron (C-nZVI). Both nZVIs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The characterization results showed that S-nZVI had smaller particles and a more uniform particle size distribution than C-nZVI. Both nZVIs showed a core-shell structure with the Fe core prominently surrounded by less iron oxides of Fe and Fe. The optimal application methods to remove Cr(VI) from wastewater were also explored. The results showed that both the removal efficiencies of total Cr and Cr(VI) increased with increases in the addition of nZVIs, while the removal efficiencies of total Cr and Cr(VI) by S-nZVI were clearly higher than that of C-nZVI, especially in a low pH range (pH = 1.0-6.0). This research indicated that starch-stabilized nanoscale zero-valent iron is a valuable material to remove heavy metals from wastewater due to its stability and high reactivity.
在这项研究中，使用液相还原法制备了淀粉稳定的纳米零价铁（S-nZVI）。它被用于从废水中去除铬，并与商业纳米零价铁（C-nZVI）进行比较。两种 nZVI 都通过扫描电子显微镜（SEM）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）进行了表征。表征结果表明，S-nZVI 的颗粒更小，粒径分布更均匀，而 C-nZVI 的颗粒更大，粒径分布更宽。两种 nZVI 都表现出核壳结构，Fe 核明显被较少的 Fe 和 Fe 氧化物包围。还探索了去除废水中 Cr(VI)的最佳应用方法。结果表明，随着 nZVI 添加量的增加，总 Cr 和 Cr(VI)的去除效率均增加，而 S-nZVI 对总 Cr 和 Cr(VI)的去除效率明显高于 C-nZVI，尤其是在低 pH 值范围（pH=1.0-6.0）内。这项研究表明，由于淀粉稳定的纳米零价铁的稳定性和高反应性，它是一种从废水中去除重金属的有价值的材料。
