Analytical Center, Baikal Institute of Nature Management, Siberian Branch of Russian Academy of Sciences, Ulan-Ude, Russia.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2012;47(13):2077-83. doi: 10.1080/10934529.2012.695953.
The efficiency of UV/H(2)O(2) treatment using KrCl (222 nm) and XeBr (282 nm) excilamps was examined for removal of 2-chlorophenol (2-CP) and 4-chlorophenol (4-CP) from aqueous solution in the molecular form (pH 2 and un-adjusted pH) and anionic form (at pH 11). UV/H(2)O(2) treatment of 2- or 4-CP was initially carried out at un-adjusted pH with varying molar ratios of chlorophenol and H(2)O(2). The para-chlorobenzoic acid was used as a hydroxyl radical (•OH) probe compound. UV/H(2)O(2) treatment of 2- and 4-CP with a molar ratio of 1:25 at ambient pH and a fluence of 4.1 J/cm(2) provided a significant decrease in chemical oxygen demand (COD). Under these conditions, the •OH exposure was found to increase from 0.5 × 10(-11) and 0.4 × 10(-11) to 1.8 × 10(-11) and 1.3 × 10(-11) M min for KrCl and XeBr excilamp, respectively. Compared with direct UV photolysis, the pseudo-first-order fluence-based rate constants of 2- and 4-CP degradation in UV/H(2)O(2) process at a molar ratio of 1:25 were significantly higher for molecular 2-CP and 4-CP in the anionic form using both excilamps. Detailed information on UV fluence and/or the exposure to •OH radicals is proposed to accurately compare studies reporting the effectiveness of AOPs based on excilamps.
采用 KrCl（222nm）和 XeBr（282nm）准分子灯的 UV/H2O2 处理技术，研究了在分子态（pH2 和未调节 pH）和阴离子态（pH11）条件下，去除水溶液中 2-氯苯酚（2-CP）和 4-氯苯酚（4-CP）的效果。首先在未调节 pH 的条件下，用不同摩尔比的氯酚和 H2O2 对 2-CP 或 4-CP 进行 UV/H2O2 处理。对氯苯甲酸被用作羟基自由基（•OH）探针化合物。在环境 pH 和 4.1 J/cm2 辐照通量下，摩尔比为 1:25 的 2-CP 和 4-CP 的 UV/H2O2 处理显著降低了化学需氧量（COD）。在这些条件下，•OH 暴露量分别从 KrCl 和 XeBr 准分子灯的 0.5×10(-11)和 0.4×10(-11)增加到 1.8×10(-11)和 1.3×10(-11)M min。与直接 UV 光解相比，在摩尔比为 1:25 的 UV/H2O2 过程中，阴离子形式的分子态 2-CP 和 4-CP 的准一级基于辐照通量的降解速率常数在两种准分子灯中均显著提高。提出了关于 UV 辐照通量和/或•OH 自由基暴露的详细信息，以准确比较基于准分子灯的 AOP 有效性的研究报告。
