Photochemical Formation of Hydroxyl Radical from Effluent Organic Matter
Photochemical Formation of Hydroxyl Radical from Effluent Organic Matter
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DOI：
10.1021/es2043454
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发表时间：
2012-04-03
影响因子：
11.4
通讯作者：
Rosario-Ortiz, Fernando L.
中科院分区：
文献类型：
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作者：
Dong, Mei Mei;Rosario-Ortiz, Fernando L.
采用模拟阳光下不同处理设施收集的3个大规模废水样品，对废水有机物（EfOM）中羟基自由基（HO中心点）的光化学形成进行了评价。对于所研究的样品，HO中心点（R-HO中心点）的形成速率由苯羟基化后苯酚的形成速率获得。所研究样品的R-HO中心点值范围为2.3 - 3.8 × 10 ~（-10）M·s ~（-1）。由硝酸盐光解产生的HO中心点（R-NO3（HO中心点））的形成速率被确定为3.0 × 10（-7）M-HO中心点M-NO3（-1）s（-1）。来自EfOM的HO中心点产生速率（R-EfOM（HO））的范围为0.76至1.3 x 10（-10）M s（-1）。对于所研究的废水样品，R-EfOM（HO中心点）以摩尔碳计在1.5至2.4 × 10（-7）M-HO中心点M-C（-1）s（-1）之间变化，这与硝酸盐光解产生HO中心点有关。在超纯水中，对于290-400 nm的波长范围，由硝酸盐（Phi（a）（NO3-HO中心点））形成HO中心点的表观量子产率被确定为0.010 +/- 0.001。EfOM中HO中心点形成的表观量子产率（Phi（a）（EfOM-HO中心点））范围为6.1至9.8 × 10 - 5，而有机物（OM）分离物的表观量子产率为2.99至4.56 × 10-5。结果表明，废水排放可以产生显著浓度的HO中心点，表现为潜在的较高硝酸盐水平和来自EfOM的HO中心点形成的相对较高的量子产率。
The photochemical formation of hydroxyl radical (HO center dot) from effluent organic matter (EfOM) was evaluated using three bulk wastewater samples collected at different treatment facilities under simulated sunlight. For the samples studied, the formation rates of HO center dot (R-HO center dot) were obtained from the formation rate of phenol following the hydroxylation of benzene. The values of R-HO center dot ranged from 2.3 to 3.8 x 10(-10) M s(-1) for the samples studied. The formation rate of HO center dot from nitrate photolysis (R-NO3(HO center dot)) was determined to be 3.0 x 10(-7) M-HO center dot M-NO3(-1) s(-1). The HO center dot production rate from EfOM (R-EfOM(HO)) ranged from 0.76 to 1.3 x 10(-10) M s(-1). For the wastewater samples studied, R-EfOM(HO center dot) varied from 1.5 to 2.4 x 10(-7) M-HO center dot M-C(-1) s(-1) on molar carbon basis, which was dose to HO center dot production from nitrate photolysis. The apparent quantum yield for the formation of HO center dot from nitrate (Phi(a)(NO3-HO center dot)) was determined as 0.010 +/- 0.001 for the wavelength range 290-400 nm in ultrapure water. The apparent quantum yield for HO center dot formation in EfOM (Phi(a)(EfOM-HO center dot)) ranged from 6.1 to 9.8 x 10(-5), compared to 2.99 to 4.56 x 10-5 for organic matter (OM) isolates. The results indicate that wastewater effluents could produce significant concentrations of HO center dot, as shown by potential higher nitrate levels and relatively higher quantum yields of HO center dot fori-nation from EfOM.