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Ultraviolet Irradiation of Permanganate Enhanced the Oxidation of Micropollutants by Producing HO• and Reactive Manganese Species
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2018-09-05 , DOI: 10.1021/acs.estlett.8b00402
Kaiheng Guo 1 , Jinsong Zhang 2 , Ailin Li 1 , Ruijie Xie 1 , Zhuojian Liang 1 , Anna Wang 1 , Li Ling 3 , Xuchun Li 4 , Chuanhao Li 1 , Jingyun Fang 1
Affiliation  

Permanganate was activated by ultraviolet (UV) photolysis at 254 nm, resulting in the efficient degradation of micropollutants. The degradation of four probe molecules (i.e., nitrobenzene, benzoic acid, terephthalic acid, and p-chlorobenzoic acid) and two micropollutants (i.e., gemfibrozil and nalidixic acid) resistant to permanganate oxidation was enhanced by the UV/permanganate system, with pseudo-first-order rate constants (k′) of 0.065–0.678 min–1 under the experimental conditions. Hydroxyl radicals (HO) and Mn(V) peroxide, which were produced during the activation of permanganate by UV irradiation, were responsible for the enhancement. The quantum yield of HO was 0.025 ± 0.001 mol Einstein–1 (mol Es–1) in the system. HO oxidation primarily accounted for the degradation of nitrobenzene and gemfibrozil, while both HO and Mn(V) were responsible for the degradation of benzoic acid, terephthalic acid, p-chlorobenzoic acid, and nalidixic acid. This study is the first report on the activation of permanganate by UV irradiation for the abatement of micropollutants in water treatment, which may lead to a new advanced oxidation process relying on both HO and reactive manganese species.

中文翻译:

高锰酸盐的紫外线照射通过产生HO 和活性锰物种增强了微污染物的氧化。

高锰酸盐在254 nm处被紫外线(UV)光解活化,导致微污染物的有效降解。紫外线/高锰酸盐体系可增强四个抗高锰酸盐氧化能力的探针分子(即硝基苯,苯甲酸,对苯二甲酸和氯苯甲酸)和两种微污染物(即吉非贝齐和萘啶酸)的降解。在实验条件下,一级速率常数(k')为0.065–0.678 min –1。羟基自由基(HO )和Mn(V)过氧化氢是在增强高锰酸盐通过UV辐射过程中产生的。HO 的量子产率为0.025±0.001 mol爱因斯坦系统中的–1(mol Es –1)。HO 氧化主要是造成硝基苯和吉非贝齐的降解,而HO 和Mn(V)均引起苯甲酸,对苯二甲酸,氯苯甲酸和萘啶酸的降解。这项研究是第一个关于紫外线辐射活化高锰酸盐以减少水处理中微污染物的报道,这可能导致依赖于HO 和反应性锰物种的新的高级氧化过程。
更新日期:2018-09-05
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