南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (3): 504510.doi: 10.13232/j.cnki.jnju.2019.03.018
董越男,吴兵党*
Dong Yuenan,Wu Bingdang*
摘要: 紫外/乙酰丙酮(UV/AA)法是一种新型的光化学技术,具有出色的脱色染料效果,但水中共存离子对该方法影响的研究较少. 以一种典型的难降解偶氮染料甲基橙(MO)为研究对象,考察了游离铁离子(Fe2+,Fe3+)和络合态Fe(III)(Fe(AA)3)对UV/AA法降解MO的影响. 结果表明,游离铁离子在UV下可直接光解染料MO,降解速率为0.004 min-1(Fe2+)和0.014 min-1(Fe3+),但抑制了UV/AA法(0.025 min-1)降解MO的效果. 三种形态铁离子对MO降解的抑制顺序为Fe2+(0.010 min-1)>Fe3+(0.012 min-1)>Fe(AA)3(0.018 min-1). 通过检测不同体系的紫外可见吸收谱图及降解产物,推测出抑制作用主要源于铁离子络合游离AA引起的内滤光效应及对游离AA的消耗,对UV/AA法的实际应用有指导意义.
中图分类号:
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