CAJ | 학술논문

25 ℃和pH 30～50条件下,研究了Mn(Ⅱ)和Fe(Ⅲ)对草酸还原Cr(Ⅵ)的催化作用.结果表明:避光条件下,Mn(Ⅱ)对草酸还原Cr(Ⅵ)有显著的催化作用,光照下其催化作用进一步得到提高.然而,避光条件下Fe(Ⅲ)对草酸还原Cr(VI)的影响甚微,但在光照条件下,Fe(Ⅲ)表现出极优越的催化作用.溶液pH值和照射光波长对反应有显著影响,Mn(Ⅱ)和Fe(Ⅲ)的催化作用随pH值提高而减弱;紫外光照射下两金属离子的催化作用大于模拟日光照射的.因此,本研究结果对由Cr(Ⅵ)引起的土壤和水的污染治理具有理论和实践指导意义.
25 ℃화pH 30～50조건하,연구료Mn(Ⅱ)화Fe(Ⅲ)대초산환원Cr(Ⅵ)적최화작용.결과표명:피광조건하,Mn(Ⅱ)대초산환원Cr(Ⅵ)유현저적최화작용,광조하기최화작용진일보득도제고.연이,피광조건하Fe(Ⅲ)대초산환원Cr(VI)적영향심미,단재광조조건하,Fe(Ⅲ)표현출겁우월적최화작용.용액pH치화조사광파장대반응유현저영향,Mn(Ⅱ)화Fe(Ⅲ)적최화작용수pH치제고이감약;자외광조사하량금속리자적최화작용대우모의일광조사적.인차,본연구결과대유Cr(Ⅵ)인기적토양화수적오염치리구유이론화실천지도의의.
The catalytic role of Mn( Ⅱ) and Fe( Ⅲ) in the reduction of Cr(Ⅵ) by oxalic acid was investigated at 25℃ and in a pH range from 3. 0 to 5. 0. The results demonstrated that Mn( Ⅱ ) greatly catalyzed the reduction of Cr( Ⅵ) by oxalic acid without light and the reaction rate was increased further in the presence of Mn( Ⅱ ) with light. Without light, the effect of Fe( Ⅲ) on the reduction of Cr( Ⅵ) by oxalic acid was neglected. However, the reaction rate was markedly accelerated with light. Solution acidic degree and light wavelength exerted an important influence on the reduction of Cr( Ⅵ). The catalysis of Mn (Ⅱ) and Fe( Ⅱ) was reduced with pH rising. Under UV irradiation, the catalysis of Mn(Ⅱ) and Fe( Ⅲ) was much stronger than that of mimicking solar light. So, the results are helpful for treating the soil and water contaminated by Cr( Ⅵ).