紫外光强化Fe(II)-EDTA活化过硫酸盐降解直接耐酸大红4BS

Q2 Environmental Science 环境科学研究 Pub Date : 2017-07-25 DOI:10.13198/j.issn.1001-6929.2017.02.44

尹汉雄, 唐玉朝, 黄显怀, 薛莉娉, 徐满天, 胡伟, 王涛

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Abstract

为探索硫酸根自由基对偶氮染料的降解能力，以直接耐酸大红4BS（下称大红4BS）为模拟污染物，通过UV/Fe（Ⅱ）-EDTA/PDS（PDS为过硫酸钠）体系，探讨了初始c（PDS）、Fe（Ⅱ）/EDTA（摩尔比）、无机盐阴离子等对大红4BS降解的影响.结果表明，大红4BS的脱色率随着初始c（PDS）的增加而增大，当c（PDS）超过15 mmol/L时无显著变化.Fe（Ⅱ）/EDTA比在5:1时效果最好，5 min时使0.038 0 mmol/L大红4BS的脱色率达到93.6%.反应符合二级动力学模型.HCO3-、Cl-、NO3-、SO42-等无机盐阴离子表现出明显抑制作用，c（无机盐阴离子）在100 mmol/L条件下，脱色率分别降低66.9%、13.2%、12.1%、9.43%.利用紫外可见光谱，依据其结构与特征吸收的关系，初步推测自由基离子对大红4BS降解的途径:苯环最先遭到破坏，随后偶氮键断裂、萘环开裂.研究显示，UV光可有效强化Fe（Ⅱ）-EDTA活化过硫酸盐形成SO4-·自由基，对偶氮染料具有很好的脱色能力，最佳反应条件[PDS:Fe（Ⅱ）:EDTA（摩尔比）为15:5:1]下，大红4BS在10 min时脱色率高达98.1%.

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紫外光强化Fe(II)-EDTA活化过硫酸盐降解直接耐酸大红4BS

In order to explore the degradation ability of sulfate radical on azo dyes, direct acid resistant red 4BS (hereinafter referred to as red 4BS) was used as a simulated pollutant. The effects of initial c (PDS), Fe (II)/EDTA (molar ratio), and inorganic salt anions on the degradation of red 4BS were investigated through a UV/Fe (II) - EDTA/PDS (PDS is sodium persulfate) system. The results showed that the decolorization rate of red 4BS increased with the increase of initial c (PDS), When c (PDS) exceeds 15 mmol/L, there is no significant change. The best effect is achieved when the Fe (II)/EDTA ratio is 5:1, and the decolorization rate of 0.0380 mmol/L bright red 4BS reaches 93.6% at 5 minutes. The reaction follows a second-order kinetic model. Inorganic salt anions such as HCO3-, Cl -, NO3-, SO42- exhibit significant inhibitory effects on production. Under 100 mmol/L conditions, the decolorization rate of c (inorganic salt anions) decreases by 66.9%, 13.2%, 12.1%, and 9.43%, respectively. By using UV visible spectroscopy, Based on the relationship between its structure and characteristic absorption, it is preliminarily speculated that the pathway of free radical ions in the degradation of bright red 4BS is the first destruction of the benzene ring, followed by the cleavage of the azo bond and the cracking of the naphthalene ring. Studies have shown that UV light can effectively strengthen the activation of perovsulfate by Fe (II) - EDTA to form SO4- · radicals, which has good decolorization ability for azo dyes. The optimal reaction conditions are [PDS: Fe (II): EDTA (molar ratio 15:5:1)], The decolorization rate of Dahong 4BS is as high as 98.1% at 10 minutes

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