State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
J Hazard Mater. 2011 Nov 15;195:371-7. doi: 10.1016/j.jhazmat.2011.08.054. Epub 2011 Aug 24.
The oxidation kinetics of four phthalate esters (PAEs) with ozone alone and hydroxyl radical (OH) were investigated. The toxicity reduction in the process of O(3)/H(2)O(2) was evaluated. The second order rate constants for the reaction of four PAEs with ozone and OH were determined by direct oxidation method and competition kinetics method in bench-scale experiment, and found to be 0.06-0.1M(-1)s(-1) and (3-5) × 10(9)M(-1)s(-1), respectively. The oxidation kinetic rate constant of the selected PAEs (diethyl phthalate, DEP) was confirmed using Song Hua-jiang river water as the background. The results indicated that DEP degradation in this river water was close to the simulated value based on the determined rate constants. The toxicity test performed with bioluminescence test, showed that the toxicity expressed as the inhibition rate changed from 36% to below detection limit in the process of O(3)/H(2)O(2), which means that catalytic ozonation is an efficient way for DEP degradation and toxicity reduction, but an ineffective method for DEP minimization on the basis of the total organic carbon determination.
研究了臭氧单独作用和羟基自由基（OH）作用下四种邻苯二甲酸酯（PAE）的氧化动力学。评价了 O(3)/H(2)O(2 过程中的毒性降低。在台架实验中，通过直接氧化法和竞争动力学法确定了四种 PAE 与臭氧和 OH 的二级反应速率常数，分别为 0.06-0.1M(-1)s(-1)和（3-5）×10(9)M(-1)s(-1)。使用松花江河水作为背景，通过选定的 PAE（邻苯二甲酸二乙酯，DEP）的氧化动力学速率常数进行了确认。结果表明，基于确定的速率常数，DEP 在这条河水中的降解与模拟值接近。采用生物发光试验进行的毒性试验表明，在 O(3)/H(2)O(2 过程中，毒性表示为抑制率从 36%降至检测限以下，这意味着催化臭氧化是 DEP 降解和毒性降低的有效方法，但从总有机碳测定的角度来看，对于 DEP 的最小化并不是一种有效的方法。
