Abstract Groundwater is a source for drinking water in many countries, and its use is seriously threatened by the leaching of agrochemicals through the soil. With this aim, the oxidation of triclopyr and fluroxypyr in water was investigated at lab-scale using heterogeneous photocatalysis and photo-assisted ozonation combined with hydrogen peroxide H2O2 (peroxone process). For both herbicides, the order of effectiveness of the photo-assisted treatments in pure water were as follows: O3/H2O2>ZnO/Na2S2O8>TiO2/Na2S2O8. Comparing the three types of water, the rate constants through peroxone/UV process were in the order: Pure > Drinking > Leaching water, according to the complexity of the matrix. After two hours of treatment, fluroxypyr was completely removed from pure water, while 90 % and 55 % of its initial mass were removed from drinking and leaching water, respectively. On the other hand, the degradation of triclopyr was significantly slower. In this case, after two hours of illumination the complete degradation was not reached in any case. Owing to the generation of hydroxyl radicals (HO ) the water treatment with O3/H2O2/UV can be considered as an eco-friendly technology, although the substances present in the matrix, mainly in leaching water, can scavenge HO decreasing the photooxidation rate of both herbicides.

中文翻译：

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通过光辅助过氧化作用减少纯水、饮用水和浸出水中的氟草烟和绿草定残留

摘要 地下水是许多国家的饮用水源，其使用受到土壤浸出的农用化学品的严重威胁。为此，使用非均相光催化和光辅助臭氧化结合过氧化氢 H2O2（过氧酮工艺）在实验室规模研究了绿草定和氟草烟在水中的氧化。对于两种除草剂，纯水中光辅助处理的有效性顺序如下：O3/H2O2>ZnO/Na2S2O8>TiO2/Na2S2O8。比较三种类型的水，根据基质的复杂性，通过过氧酮/UV 过程的速率常数依次为：纯水 > 饮用水 > 浸出水。经过两个小时的处理，氟草烟从纯水中完全去除，而其初始质量的 90% 和 55% 分别从饮用水和浸出水中去除。另一方面，绿草定的降解明显更慢。在这种情况下，在照明两小时后，无论如何都没有达到完全降解。由于产生羟基自由基 (H2O)，O3/H2O2/UV 水处理可以被认为是一种环保技术，尽管基质中存在的物质，主要是在浸出水中，可以清除 H2O 降低光氧化速率两种除草剂。