纳米零价铁对水中砷和硒去除的比较研究

发布时间：2018-02-08 08:47

  本文关键词： 纳米零价铁 砷 硒 去除　出处：《化学学报》2017年06期 　论文类型：期刊论文

【摘要】：采用纳米零价铁去除水中的砷和硒,考察了不同溶解氧、纳米零价铁投加量、接触时间以及溶液初始pH值等条件下纳米零价铁去除水中砷和硒的效果,并比较了反应前后固体的形貌、组成、溶液pH值及反应机制.结果表明,纳米零价铁可广泛用于去除水中的砷/硒污染,去除效果顺序依次为Se(Ⅳ)As(Ⅲ)Se(Ⅵ)As(Ⅴ);水中溶解氧(DO)对As(Ⅲ)和Se(Ⅳ)的去除没有显著的影响,而高浓度的DO对As(Ⅴ)和Se(Ⅵ)的去除产生了一定的抑制作用;增加纳米零价铁投加量可促进砷和硒的去除;溶液初始pH值对纳米零价铁去除As(Ⅲ),As(Ⅴ)和Se(Ⅵ)的影响较大,而对Se(Ⅳ)的去除几乎没有影响;反应后固体的形貌、组成及溶液pH值存在差异.纳米零价铁与砷、硒反应机理的不同造成了去除效果及反应后固液两相的差异.
[Abstract]:The removal of arsenic and selenium in water by nanometer zero-valent iron was investigated under the conditions of different dissolved oxygen, dosage of nano-zero-valent iron, contact time and initial pH value of solution. The morphology, composition, pH value and reaction mechanism of the solid before and after the reaction were compared. The results showed that the nanometer zero-valent iron could be widely used to remove arsenic / selenium pollution in water. The order of removal effect is that the removal of as (鈪，

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