高价铬及双酚A在铁-乳酸体系中的同时光处理
Simultaneous photoprocess of hexavalent chromium and BPA in ferric-lactate system
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摘要: 研究了Fe(Ⅲ)-乳酸配合物体系同时对Cr(Ⅵ)的光还原及双酚A(BPA)的光氧化处理，考察了光源、初始pH值、Fe(Ⅲ)、乳酸盐、Cr(Ⅵ)及BPA初始浓度等因素对Cr(Ⅵ)及BPA光处理效率的影响。结果表明：光照条件下，铁乳酸配合物能有效实现对六价铬及BPA的同时光处理。同一体系中，Cr(Ⅵ)的光还原快于BPA的光氧化，Fe(Ⅲ)初始浓度的增加可同时提高Cr(Ⅵ)的光还原效率和BPA的光氧化效率；Fe(Ⅲ)-乳酸盐配合物光解产生的Fe(Ⅱ)是Cr(Ⅵ)的主要还原剂，其次级光反应中产生的·OH是BPAAbstract: Simultaneous photochemical reduction of Cr(Ⅵ) and photochemical oxidation of BPA in aqueous solutions containing Fe(Ⅲ)-lactate complexes were preliminarily investigated, and the effects of different factors such as light source, the initial pH, the initial concentrations of Fe (Ⅲ), lactate, Cr(Ⅵ) and BPA were discussed in detail. The results indicate that hexavalent chromium and BPA can be efficiently photoprocessed by Fe(Ⅲ)-lactate complexes. The photoreduction of Cr(Ⅵ) is much faster than the photooxidation of BPA in the same system. The efficiency of Cr(Ⅵ) photoreduction and BPA photooxidation can be enhanced simultaneously by increasing the initial concentration of Fe (Ⅲ). Fe(Ⅱ) generated by the photolysis of Fe (Ⅲ)-lactate complexes is the main reductant of Cr(Ⅵ). Hydroxyl radical generated from subreaction is the main oxidant of BPA.
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Key words:
- Cr (Ⅵ) /
- BPA /
- Fe (Ⅲ) /
- lactate /
- photoprocess
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