铁-苹果酸配合物对高价铬的光还原处理
Photoreduction of hexavalent chromium induced by ferric-malate complexes
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摘要: 研究了Fe(Ⅲ)-苹果酸配合物体系对Cr(Ⅵ)的光还原处理，考察了光源、初始pH值、Fe(Ⅲ)、苹果酸盐和Cr(Ⅵ)初始浓度等因素对Cr(Ⅵ)光还原效率的影响。结果表明：光照条件下，铁-苹果酸配合物能有效实现对六价铬的光还原。pH=3时Cr(Ⅵ)的光还原处理效果最佳；Fe(Ⅲ)和苹果酸盐初始浓度的增加可提高Cr(Ⅵ)的光还原效率；光还原的初始速率随各组分浓度的增大而增大，Fe(Ⅲ)浓度是影响反应速率的主要因素；Fe(Ⅲ)-苹果酸盐配合物光解产生的Fe(Ⅱ)是Cr(Ⅵ)的主要还原剂。Abstract: The photochemical reduction of Cr(Ⅵ) in aqueous solutions containing Fe (Ⅲ)-malate complexes was preliminarily investigated, and the effects of different factors such as lights source, the initial pH, the initial concentrations of Fe (Ⅲ), malate and Cr(Ⅵ) were discussed in detail. The results indicate that hexavalent chromium can be efficiently photoreduced by Fe(Ⅲ)-malate complexes. The optimum pH for photoreduction of Cr(Ⅵ) is 3. The photoreduction efficiency of Cr(Ⅵ) can be enhanced by increasing the initial concentrations of Fe (Ⅲ) or malate. The initial rate of photoreduction increases with the concentration of each component. The concentration of Fe(Ⅲ) is the ratecontrolling factor. Fe(Ⅱ) generated by the photolysis of Fe (Ⅲ)-malate complexes is the main reductant.
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Key words:
- Cr (Ⅵ) /
- Fe (Ⅲ) /
- malate /
- complexes /
- photoreduction
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