Adityosulindro Sandyanto, Barthe Laurie, González-Labrada Katia, Jáuregui Haza Ulises Javier, Delmas Henri, Julcour Carine
Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.
Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.
Ultrason Sonochem. 2017 Nov;39:889-896. doi: 10.1016/j.ultsonch.2017.06.008. Epub 2017 Jun 16.
Two sonochemical processes were compared for the removal of ibuprofen in different water matrixes (distilled water and effluent from wastewater treatment plant). The effect of various operating parameters, such as pH (2.6-8.0), ultrasound power density (25-100W/L), sonication frequency (12-862kHz), addition of radical promoters (HO and Fenton's reagent) or scavengers (n-butanol and acetic acid), was evaluated. Sono-degradation of ibuprofen followed a first-order kinetic trend, whose rate constant increased with ultrasound density and frequency. For this hydrophobic and low volatile molecule, a free-radical mechanism at the bubble interface was established. Coupling ultrasound with Fenton reaction showed a positive synergy, especially in terms of mineralization yield, while adding HO alone had no significant beneficial effect. Dedicated experiments proved this synergy to be due to the enhanced regeneration of ferrous ions by ultrasound. Efficacy of the sonolysis process was hampered in wastewater matrix, mainly as the consequence of higher pH increasing the molecule solubility. However, after convenient acidification, sono-Fenton oxidation results remained almost unchanged, indicating no significant radical scavenging effects from the effluent compounds.
比较了两种声化学方法在不同水基质（蒸馏水和污水处理厂出水）中去除布洛芬的效果。评估了各种操作参数的影响，如pH值（2.6 - 8.0）、超声功率密度（25 - 100W/L）、超声频率（12 - 862kHz）、添加自由基促进剂（羟基自由基和芬顿试剂）或清除剂（正丁醇和乙酸）。布洛芬的声降解遵循一级动力学趋势，其速率常数随超声密度和频率的增加而增大。对于这种疏水性和低挥发性的分子，在气泡界面建立了自由基机制。超声与芬顿反应耦合显示出正协同效应，特别是在矿化率方面，而单独添加羟基自由基没有显著的有益效果。专门的实验证明这种协同效应是由于超声增强了亚铁离子的再生。声解过程的效果在废水基质中受到阻碍，主要是因为较高的pH值增加了分子的溶解度。然而，经过适当酸化后，超声 - 芬顿氧化结果几乎保持不变，表明废水化合物没有显著的自由基清除作用。
