太阳能光催化臭氧氧化：一种用于降解水中污染物的新型处理方法。
Solar photo-ozonation: A novel treatment method for the degradation of water pollutants.
机构信息
Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avenida de Elvas S/N, 06071 Badajoz, Spain.
Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avenida de Elvas S/N, 06071 Badajoz, Spain.
出版信息
J Hazard Mater. 2016 Nov 5;317:36-43. doi: 10.1016/j.jhazmat.2016.05.050. Epub 2016 May 17.
The decomposition of aqueous ozone by UV-vis radiation has been investigated with focus on the impact of ozone photolysis on the degradation of water pollutants during solar ozonation processes. The apparent first-order rate constants of the decomposition of ozone (kobs) have been determined at various pHs in the 4-9 range using radiation of different wavelengths in the UV-vis range. It was found that UVA-visible radiation (λ>320nm) highly enhanced ozone decomposition, especially at pH 4, for which kobs was three-folded with respect to the process in the absence of radiation. Hydrogen peroxide was identified as a main intermediate of ozone photo-decomposition at pH 4. Experiments of degradation of oxalic acid by ozone showed that solar irradiation brings about an increase in the hydroxyl radical to ozone exposures ratio (Rct). Finally, photo-ozonation (λ>300nm) was shown advantageous over single ozonation in the mineralization of a selection of emerging contaminants (metoprolol, ibuprofen, N,N-diethyl-meta-toluamide and clofibric acid) in both ultrapure water and a synthetic secondary effluent. Thus, TOC removal in 2-h treatments increased from 10 to 25% in the absence of radiation to about 50% in the presence of radiation.
研究了 UV-vis 辐射对水相臭氧分解的影响，重点关注臭氧光解对太阳臭氧化过程中水中污染物降解的影响。在 4-9 的 pH 值范围内，使用不同波长的 UV-vis 辐射，确定了臭氧分解的表观一级速率常数（kobs）。结果表明，UVA-可见光（λ>320nm）显著促进了臭氧分解，特别是在 pH 4 时，kobs 是无辐射条件下的三倍。在 pH 4 时，过氧化氢被确定为臭氧光分解的主要中间产物。臭氧氧化草酸的降解实验表明，太阳辐射导致羟基自由基与臭氧暴露比（Rct）增加。最后，光臭氧化（λ>300nm）在纯水中和合成二级出水中，对一系列新兴污染物（美托洛尔、布洛芬、N，N-二乙基间甲苯酰胺和氯菲酸）的矿化均优于单独臭氧化。因此，在无辐射条件下，2 小时处理后 TOC 的去除率从 10%增加到 25%，而在有辐射的情况下增加到约 50%。
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