当前位置: X-MOL 学术Chemosphere › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Discerning the inefficacy of hydroxyl radicals during perfluorooctanoic acid degradation.
Chemosphere ( IF 8.8 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.chemosphere.2020.125883
Hassan Javed 1 , Cong Lyu 2 , Ruonan Sun 3 , Danning Zhang 4 , Pedro J J Alvarez 5
Affiliation  

Perfluorooctanoic acid (PFOA) is a recalcitrant contaminant of emerging concern, and there is growing interest in advanced oxidation processes to degrade it. However, there is ambiguity in the literature about the efficacy of hydroxyl radicals (OH) for degrading PFOA. Here, we resolve this controversy by comparing PFOA degradation by UV photolysis (254 nm, 6 × 10-6 E/L.s) versus UV + H2O2, which produces OH. We optimized OH production in a UV + H2O2 system using nitrobenzene (NB) as a OH probe, but even under optimized conditions (i.e., 5 g/L H2O2), no significant difference occurred in PFOA removal by UV photolysis (21.1 ± 0.4%) versus UV + H2O2 (19.7 ± 0.7%) after 1-day treatment. Both treatments also resulted in similar daughter by-product concentrations and defluorination efficiencies (9.5 ± 1.7% for UV photolysis and 6.8 ± 1.0% for UV + H2O2), which indicates that OH is ineffective towards PFOA degradation and infers that other degradation mechanisms that are independent of OH production should be explored.

中文翻译:

识别全氟辛酸降解过程中羟基的无效性。

全氟辛酸(PFOA)是一种顽固的污染物,正在引起人们的关注,并且人们对将其降解的高级氧化工艺越来越感兴趣。然而,文献中关于羟基自由基(OH)降解PFOA的功效存在歧义。在这里,我们通过比较紫外光分解(254 nm,6×10-6 E / Ls)对PFOA的降解与产生OH的UV + H2O2来解决这一争议。我们使用硝基苯(NB)作为OH探针在UV + H2O2系统中优化了OH的生成,但是即使在优化的条件下(即5 g / L H2O2),通过UV光解法去除PFOA的情况也没有显着差异(21.1±0.4%) )与1天治疗后的UV + H2O2(19.7±0.7%)。两种处理方法均产生相似的子副产物浓度和脱氟效率(UV光解为9.5±1.7%,UV + H2O2为6.8±1.0%),
更新日期:2020-01-11
down
wechat
bug