本文關鍵詞： 納米零價鐵 砷 硒 去除　出處：《化學學報》2017年06期 　論文類型：期刊論文

【摘要】：采用納米零價鐵去除水中的砷和硒,考察了不同溶解氧、納米零價鐵投加量、接觸時間以及溶液初始pH值等條件下納米零價鐵去除水中砷和硒的效果,并比較了反應前后固體的形貌、組成、溶液pH值及反應機制.結果表明,納米零價鐵可廣泛用于去除水中的砷/硒污染,去除效果順序依次為Se(Ⅳ)As(Ⅲ)Se(Ⅵ)As(Ⅴ);水中溶解氧(DO)對As(Ⅲ)和Se(Ⅳ)的去除沒有顯著的影響,而高濃度的DO對As(Ⅴ)和Se(Ⅵ)的去除產(chǎn)生了一定的抑制作用;增加納米零價鐵投加量可促進砷和硒的去除;溶液初始pH值對納米零價鐵去除As(Ⅲ),As(Ⅴ)和Se(Ⅵ)的影響較大,而對Se(Ⅳ)的去除幾乎沒有影響;反應后固體的形貌、組成及溶液pH值存在差異.納米零價鐵與砷、硒反應機理的不同造成了去除效果及反應后固液兩相的差異.
[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，

本文編號：1495062