零价铁纳米颗粒在各种实验条件下对水中锌离子的去除应用。
Application of zero-valent iron nanoparticles for the removal of aqueous zinc ions under various experimental conditions.
作者信息
Liang Wen, Dai Chaomeng, Zhou Xuefei, Zhang Yalei
机构信息
State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, China.
State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, China ; College of Civil Engineering, Tongji University, Shanghai, China.
出版信息
PLoS One. 2014 Jan 9;9(1):e85686. doi: 10.1371/journal.pone.0085686. eCollection 2014.
Application of zero-valent iron nanoparticles (nZVI) for Zn²⁺ removal and its mechanism were discussed. It demonstrated that the uptake of Zn²⁺ by nZVI was efficient. With the solids concentration of 1 g/L nZVI, more than 85% of Zn²⁺ could be removed within 2 h. The pH value and dissolved oxygen (DO) were the important factors of Zn²⁺ removal by nZVI. The DO enhanced the removal efficiency of Zn²⁺. Under the oxygen-contained condition, oxygen corrosion gave the nZVI surface a shell of iron (oxy)hydroxide, which could show high adsorption affinity. The removal efficiency of Zn²⁺ increased with the increasing of the pH. Acidic condition reduced the removal efficiency of Zn²⁺ by nZVI because the existing H⁺ inhibited the formation of iron (oxy)hydroxide. Adsorption and co-precipitation were the most likely mechanism of Zn²⁺ removal by nZVI. The FeOOH-shell could enhance the adsorption efficiency of nZVI. The removal efficiency and selectivity of nZVI particles for Zn²⁺ were higher than Cd²⁺. Furthermore, a continuous flow reactor for engineering application of nZVI was designed and exhibited high removal efficiency for Zn²⁺.
讨论了零价铁纳米颗粒（nZVI）在去除Zn²⁺方面的应用及其机制。结果表明，nZVI对Zn²⁺的吸收效率很高。当nZVI的固体浓度为1 g/L时，2小时内可去除超过85%的Zn²⁺。pH值和溶解氧（DO）是nZVI去除Zn²⁺的重要因素。DO提高了Zn²⁺的去除效率。在含氧条件下，氧腐蚀使nZVI表面形成一层铁（氢）氧化物壳，其具有很高的吸附亲和力。Zn²⁺的去除效率随pH值的升高而增加。酸性条件降低了nZVI对Zn²⁺的去除效率，因为存在的H⁺抑制了铁（氢）氧化物的形成。吸附和共沉淀是nZVI去除Zn²⁺最可能的机制。FeOOH壳可以提高nZVI的吸附效率。nZVI颗粒对Zn²⁺的去除效率和选择性高于Cd²⁺。此外，设计了一种用于nZVI工程应用的连续流反应器，其对Zn²⁺表现出很高的去除效率。
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